Equipment catalogue

What Qing knows how to buy — and what it will refuse to

categories
1478
freely routable
1283
no export gate on the item itself
classify before outreach
141
control depends on measured parameters
never routed
42
advanced-computing ECCNs

42 categories are refused at the catalogue, not escalated

A PRC-incorporated entity cannot lawfully be the seller of an advanced-computing item (ECCN 3A090 / 4A090) to any destination worldwide, non-US manufacture does not escape the Foreign Direct Product Rule, and every credible PRC accelerator vendor is Entity Listed. Qing refuses at the catalogue rather than opening a conversation and escalating, because the conversation itself creates a record. See the compliance perimeter →

12 near-duplicate pairs need curating — they are why a matched requirement sometimes comes back ambiguous

The importer collapses pure reorderings and empty qualifiers automatically. It will not decide whether “(x86)” distinguishes a product — that depends on whether an ARM variant exists, and guessing wrong destroys a real distinction. These are left for a human.

  • 1.001U dual-socket rack server (x86)↔2U dual-socket rack server (x86)
  • 1.001U tool-less ball-bearing slide rail kit↔2U tool-less ball-bearing slide rail kit
  • 1.00Active optical cable (AOC), 400G/800G↔Active optical cable (AOC), 400G/800G, 3-30 m
  • 1.00Cable management arm (CMA) 1U/2U↔Cable management arm (CMA)
  • 1.00Enterprise NVMe SSD, U.2/E1.S/E3.S, 3.84-30.72 TB↔Enterprise NVMe SSD, E3.S
  • 1.00Enterprise NVMe SSD, U.2/U.3↔Enterprise NVMe SSD, U.2/E1.S/E3.S, 3.84-30.72 TB
  • 1.00Enterprise NVMe SSD, U.2/U.3↔Enterprise NVMe SSD, E3.S
  • 1.00General-purpose 2U dual-socket rack server↔1U dual-socket rack server
  • 1.00High-capacity QLC NVMe SSD↔E1.L NVMe QLC high-capacity SSD
  • 1.00Type 2 surge protective device↔Surge protective device, Type 1+2 and Type 2
  • 0.88Rear-door heat exchanger, active (fan-assisted)↔Rear-door heat exchanger, active (fan-assisted), 60-100 kW
  • 0.88Single-phase immersion dielectric fluid, synthetic ester base↔Single-phase immersion dielectric fluid (synthetic hydrocarbon / ester)
All 1478Cooling 296Power 270IT hardware 240Facility systems 212White space 198Optics & cabling 111Compute 72Consumables 49Prefabricated 30

Facility systems

Each carries the questions that make two quotes comparable, and the traps specific to it

showing 60
  • 31 CFR Part 850 outbound investment screen (Treasury OISP)美国对外投资安全审查 (31 CFR 850) 筛查
    Facility systemsper screenCN supply: not made in China
    unrestricted
    7 ways buyers get burned here
    • Assuming 'not US-origin' means 'not subject to the EAR'. The Advanced Computing FDPR at 734.9(h) captures foreign-produced 3A090/4A090/.z items made with listed US technology or software, or on a plant derived from it. That covers essentially all leading-edge logic on earth. De minimis analysis never even begins for an FDPR-captured item.
    • Assuming a Chinese trading company can lawfully resell a controlled accelerator abroad. It cannot: 742.6(b)(10)(iii) is presumption of denial for all reexports and for D:5/Macau-headquartered entities, and License Exception ACA at 740.8 expressly excludes entities headquartered in — or ultimately parented in — D:5 or Macau. There is no structure that fixes this.
    • Reading the January 2026 case-by-case rule as 'H200 is now sellable to China'. It permits a LICENSED US EXPORTER to apply, with four certifications including a 50%-of-US-volume cap and mandatory independent US-lab pre-export verification. It changed nothing about reexport from China, and left presumption of denial fully intact for D:5/Macau-headquartered buyers.
    • Believing the AI Diffusion Rule was rescinded and its machinery is gone. It was never rescinded in the Federal Register: 740.27 (AIA), 740.28 (ACM), 740.29 (LPP), Supplement 5 to Part 740 and the 790,000,000 TPP country allocations are all still codified at 2026-09-01. BIS announced non-enforcement of its NEW requirements in May 2025, but the 2026-05-31 guidance confirms the pre-existing November-2023 headquarters-based licence requirement IS enforced, and the 2026-06-17 FAQ extends it to .z items.
    • Treating the Affiliates Rule as dead. It is STAYED, not repealed — 2025-19846 stays the 2025-09-30 IFR until 2026-11-09, roughly two months from now. Build the 50%-ownership aggregation logic now behind a flag. Note also that FDPR footnote 5 already carries its own surviving 50%-ownership provision, and OFAC's own 50% Rule never went away.
    • Screening the brand instead of the legal entity. Entity List designations are entity-specific: 'Inspur (Beijing) Electronic Information Industry' is listed while other Inspur group companies are not, and several distinct Fudan Microelectronics entities were listed separately in September 2025. Screen the unified social credit code on the contract, plus every alias.
    • Ignoring alias sprawl. The September 2025 additions show entities with up to sixteen aliases, and the four NetForward / Nanfei entities were listed across four cities. A single-string name match will miss most of them.
  • 3D NAND wafer / KGD packaged die3D NAND晶圆 / 裸片
    Facility systemsHS 8542.32per wafer or dieCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • REFURBISHED DRIVES WITH RESET SMART. The 2025 Seagate scandal saw drives with tens of thousands of hours sold as new after SMART counters were zeroed. RFQ defence: demand `smartctl -l farm` output (smartmontools 7.4+) on 3 random units — Seagate FARM (Field Accessible Reliability Metrics) records Power-on Hours and Head Flight Hours independently and is not resettable by the tools fraudsters use. A FARM/SMART mismatch is proof, not suspicion.
    • THE POWER-CYCLE TELL. Even without FARM, a reset drive gives itself away: 2 power-on hours against 2,400 power cycles is impossible for a genuinely new drive. Always ask for power-on hours AND power cycle count AND Percentage Used together — resetters usually zero one field and forget the others.
    • COUNTERFEIT CAPACITY. SSD firmware is modified to report far more capacity than the physical NAND holds; the drive writes normally until it wraps and silently corrupts. RFQ defence: require a full-span write-then-verify test (h2testw or `badblocks -w`) on a sample, plus the flash-ID readout showing die count and per-die capacity.
    • DRAM-LESS CONTROLLERS SOLD AS ENTERPRISE. Especially in M.2 2280 and cheap U.2. RFQ defence: ask for onboard DRAM size in GB (expect roughly 1GB per 1TB NAND), reject HMB, and demand high-resolution photos of both PCB faces — a DRAM package is visible or it is not there.
    • FIRMWARE-ONLY 'PLP'. Sellers claim power loss protection with no capacitors. RFQ defence: ask for capacitor type and count and have them pointed out in the board photo; ask for JESD218 power-cycling test results. Real hardware PLP is physically countable.
    • M.2 2280 'WITH PLP'. 80mm boards rarely have room for a real capacitor bank; 22110 exists precisely because 110mm does. A 2280 PLP claim needs a board photo before it is believed.
    • THE NEARLINE HDD 'MANUFACTURER'. No PRC company manufactures hard disk drives. Only Seagate, Western Digital and Toshiba do. Any Chinese seller describing itself as the factory for 20-32TB nearline drives is a trader, relabeller or refurbisher. RFQ defence: ask for the OEM part number and an authorisation letter or upstream purchase invoice, and state in the question that you know no PRC manufacturer exists.
  • §743.9 quarterly front-end fabricator report to BIS§743.9 前道晶圆厂季度报送
    Facility systemsper filingCN supply: not made in China
    unrestricted
    7 ways buyers get burned here
    • Assuming 'not US-origin' means 'not subject to the EAR'. The Advanced Computing FDPR at 734.9(h) captures foreign-produced 3A090/4A090/.z items made with listed US technology or software, or on a plant derived from it. That covers essentially all leading-edge logic on earth. De minimis analysis never even begins for an FDPR-captured item.
    • Assuming a Chinese trading company can lawfully resell a controlled accelerator abroad. It cannot: 742.6(b)(10)(iii) is presumption of denial for all reexports and for D:5/Macau-headquartered entities, and License Exception ACA at 740.8 expressly excludes entities headquartered in — or ultimately parented in — D:5 or Macau. There is no structure that fixes this.
    • Reading the January 2026 case-by-case rule as 'H200 is now sellable to China'. It permits a LICENSED US EXPORTER to apply, with four certifications including a 50%-of-US-volume cap and mandatory independent US-lab pre-export verification. It changed nothing about reexport from China, and left presumption of denial fully intact for D:5/Macau-headquartered buyers.
    • Believing the AI Diffusion Rule was rescinded and its machinery is gone. It was never rescinded in the Federal Register: 740.27 (AIA), 740.28 (ACM), 740.29 (LPP), Supplement 5 to Part 740 and the 790,000,000 TPP country allocations are all still codified at 2026-09-01. BIS announced non-enforcement of its NEW requirements in May 2025, but the 2026-05-31 guidance confirms the pre-existing November-2023 headquarters-based licence requirement IS enforced, and the 2026-06-17 FAQ extends it to .z items.
    • Treating the Affiliates Rule as dead. It is STAYED, not repealed — 2025-19846 stays the 2025-09-30 IFR until 2026-11-09, roughly two months from now. Build the 50%-ownership aggregation logic now behind a flag. Note also that FDPR footnote 5 already carries its own surviving 50%-ownership provision, and OFAC's own 50% Rule never went away.
    • Screening the brand instead of the legal entity. Entity List designations are entity-specific: 'Inspur (Beijing) Electronic Information Industry' is listed while other Inspur group companies are not, and several distinct Fudan Microelectronics entities were listed separately in September 2025. Screen the unified social credit code on the contract, plus every alias.
    • Ignoring alias sprawl. The September 2025 additions show entities with up to sixteen aliases, and the four NetForward / Nanfei entities were listed across four cities. A single-string name match will miss most of them.
  • §744.6 US-person activity screen§744.6 美国人员活动合规筛查
    Facility systemsper screenCN supply: not made in China
    unrestricted
    7 ways buyers get burned here
    • Assuming 'not US-origin' means 'not subject to the EAR'. The Advanced Computing FDPR at 734.9(h) captures foreign-produced 3A090/4A090/.z items made with listed US technology or software, or on a plant derived from it. That covers essentially all leading-edge logic on earth. De minimis analysis never even begins for an FDPR-captured item.
    • Assuming a Chinese trading company can lawfully resell a controlled accelerator abroad. It cannot: 742.6(b)(10)(iii) is presumption of denial for all reexports and for D:5/Macau-headquartered entities, and License Exception ACA at 740.8 expressly excludes entities headquartered in — or ultimately parented in — D:5 or Macau. There is no structure that fixes this.
    • Reading the January 2026 case-by-case rule as 'H200 is now sellable to China'. It permits a LICENSED US EXPORTER to apply, with four certifications including a 50%-of-US-volume cap and mandatory independent US-lab pre-export verification. It changed nothing about reexport from China, and left presumption of denial fully intact for D:5/Macau-headquartered buyers.
    • Believing the AI Diffusion Rule was rescinded and its machinery is gone. It was never rescinded in the Federal Register: 740.27 (AIA), 740.28 (ACM), 740.29 (LPP), Supplement 5 to Part 740 and the 790,000,000 TPP country allocations are all still codified at 2026-09-01. BIS announced non-enforcement of its NEW requirements in May 2025, but the 2026-05-31 guidance confirms the pre-existing November-2023 headquarters-based licence requirement IS enforced, and the 2026-06-17 FAQ extends it to .z items.
    • Treating the Affiliates Rule as dead. It is STAYED, not repealed — 2025-19846 stays the 2025-09-30 IFR until 2026-11-09, roughly two months from now. Build the 50%-ownership aggregation logic now behind a flag. Note also that FDPR footnote 5 already carries its own surviving 50%-ownership provision, and OFAC's own 50% Rule never went away.
    • Screening the brand instead of the legal entity. Entity List designations are entity-specific: 'Inspur (Beijing) Electronic Information Industry' is listed while other Inspur group companies are not, and several distinct Fudan Microelectronics entities were listed separately in September 2025. Screen the unified social credit code on the contract, plus every alias.
    • Ignoring alias sprawl. The September 2025 additions show entities with up to sixteen aliases, and the four NetForward / Nanfei entities were listed across four cities. A single-string name match will miss most of them.
  • 8-OAM universal baseboard (UBB)八卡OAM通用基板 (UBB)
    Facility systemsHS 8473.30per baseboardCN supply: moderate
    classify first

    The regulatory boundary sits between the empty UBB and the populated one; document it explicitly.

    7 ways buyers get burned here
    • Depth is quoted without the bezel, ears, CMA or rear cable bend radius. A '798 mm' 2U server needs roughly 950-1000 mm of usable rack depth once mounted and cabled - which is why full-depth AI nodes do not belong in 1000 mm racks. Always ask for front-post-to-rear clearance, not chassis depth.
    • Rail kits and CMAs excluded from the system price without saying so. Two 'identical' server quotes can differ by the cost of rails, and the cheaper one arrives unmountable.
    • Rail load rating quoted as the static figure only. The number that matters is the rating at full extension. An 8U 130 kg GPU node exceeds ordinary ~38-45 kg kits by roughly 3x, and the failure happens the first time someone slides it out.
    • Physical x16 PCIe slots wired electrically x8, or slots that only exist when an optional riser is purchased. Demand a per-slot map: generation, electrical width, physical width, height and riser dependency.
    • PCIe Gen5 risers and cable kits sold without retimers or without an insertion-loss budget. The link trains at Gen4 or fails intermittently under load. Retimers and redrivers are not interchangeable - only protocol-aware retiming rescues a long channel.
    • Backplane described as '24-bay NVMe' when it is actually expander-attached and shares a fraction of the bandwidth. Direct-attach vs expander is the single largest hidden performance and price variable in storage servers.
    • CRPS / CRPS2 / M-CRPS power supplies that fit the same bay but use different pinouts. The PSU seats perfectly and the system will not power on.
  • Access control, CCTV and rack-level electronic lock门禁系统 / 视频监控 / 机柜电子锁
    Facility systemsHS 8531.10 / 8525.80contestedper systemCN supply: dominant
    classify first

    Missing entirely — the report covers fire but not physical security. Two live constraints: several Chinese video-surveillance brands face procurement bans in US and other Western public-sector and critical-infrastructure contexts (screen the brand before quoting); and networked cameras and controllers are squarely in EU CRA scope from 11 Sep 2026.

    7 ways buyers get burned here
    • The 'manufacturer' that is a trading company. On Alibaba and Made-in-China this is the default state for racks, containment, rack PDUs, cabling and small cooling accessories. The distinguishing evidence: (a) 经营范围 in the business licence says 销售/贸易 but not 生产; (b) the 'factory address' equals the registered office and is in an office tower, not an industrial park; (c) no 生产许可 or product certification is held in the seller's own name — certificates show a different company; (d) they are not in any CIOE/China Refrigeration/CDCC exhibitor list; (e) they quote across five unrelated categories. Always cross-check the 统一社会信用代码 on gsxt.gov.cn.
    • The reverse trap: assuming a trader is always bad. For a 20-line mixed BOM, a competent Guangdong trading company is often the only party that will handle consolidation, export documentation and one invoice. The trap is paying manufacturer margins for trader service, or letting the trader hide who actually made the goods so warranty has no counterparty.
    • Cooling capacity quoted at undeclared conditions. A '100 kW' CRAH at 15/21C chilled water is a different machine from a '100 kW' CRAH at 12/18C, and a '35 kW' passive rear door at 12C water is not the same product as one at 18C. Chinese quotes routinely omit the conditions and Western buyers routinely compare the headline number.
    • CDU kW ratings with only one loop temperature. A CDU is defined by primary in, primary out, secondary in, secondary out and both flow rates. A single number is not a specification and cannot be compared across vendors.
    • Residual air heat in liquid-cooled racks. Vendors state '90% heat captured to liquid' and buyers size the room for 10%. In practice the uncaptured fraction is often 15-25% under real workloads, and a 120 kW rack then dumps 25 kW into a hall designed for 12. Ask for kW of residual air heat per chassis, in writing.
    • Filled floor loading for immersion tanks. A filled immersion tank can exceed 2,000 kg/m2. Chinese quotes give the dry weight. The building, not the tank, is what fails.
    • Aluminium substituted for copper in busbar, busway and switchgear. It is legal, it meets the current rating, and it is not what the buyer priced. Specify conductor material and cross-section, and weigh a sample on arrival.
  • Access control panel / door controller门禁控制器
    Facility systemsHS 8543.70per unitCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Addressable fire alarm control panel (FACP) with loops火灾报警控制器（联动型）
    Facility systemsHS 8531.10per unitCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Addressable leak detection controller / panel定位式漏水检测控制器 / 报警主机
    Facility systemsHS 9032.89per unitCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Addressable point heat detector (rate-of-rise / fixed)点型感温火灾探测器
    Facility systemsHS 8531.10per pcCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Addressable point photoelectric smoke detector点型光电感烟火灾探测器
    Facility systemsHS 8531.10per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Air maintenance device / compressor for pre-action supervisory air预作用系统 空压机 / 补气装置
    Facility systemsHS 8414.80per setCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Air quality / corrosion monitoring (ISA 71.04 coupons or reactivity monitor)空气腐蚀性监测（腐蚀片 / 反应性监测仪）
    Facility systemsHS 9027.50per setCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • AMD EPYC server CPU (production, tray)霄龙服务器处理器
    Facility systemsHS 8542.31per pcCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • 'OEM' means the opposite of what you think. A Chinese seller saying OEM almost always means 代工/贴牌 — they will build or relabel to your spec, with no brand IP behind it. A Western buyer hears 'made by Dell/HPE'. Never accept the word; ask which factory designed the board and which built it, and get FCC ID / CMIIT ID and PCB silkscreen photos.
    • Engineering samples sold as production silicon. ES/QS CPUs are typically 30-50% below retail, carry no vendor warranty, and can be unstable in specific workloads. Intel states the S-spec is printed only on the IHS, that 'Intel Confidential' or a missing brand string identifies an ES, and that it may retain or destroy re-marked product. QS is nearer retail but is still a sample. Demand IHS photos and an ES/QS exclusion clause with lot-level return.
    • 拆机件 sold as new. Decommissioned DDR4 RDIMMs, RAID cards and drives are a huge, largely legitimate market — the fraud is the relabelling. Refurbishers are documented as resurfacing bad sectors, zeroing power-on hours and swapping model labels. Require original sealed packaging, single-lot date codes, and per-unit health logs.
    • SMART is not proof of a new drive. Commercial tools reset SMART attributes to factory defaults in one click. On Seagate drives the FARM log is a second, harder-to-scrub record: FARM hours exceeding SMART hours indicates tampering. On SSDs, firmware can misreport capacity and health outright, so a clean SMART page means very little.
    • Altered labels defeat verification portals. Scammers copy serials from newer drives onto old units and reprint QR codes so that vendor verification appears to pass. Verify serials yourself at the OEM portal (verify.seagate.com, cway.cisco.com/sncheck, Intel's FPO/ATPO lookup), and cross-check that the serial's warranty start date is consistent with a genuinely new unit.
    • Remarked memory. A DDR5-4800 module relabelled as 6400, or SK hynix dies under a Samsung label, is caught only by comparing three layers: printed module label, SPD dump, and the die markings on the chips themselves. Any disagreement across those three is disqualifying.
    • Vendor-locked parts that boot nowhere. AMD PSB-locked EPYCs, crossflashed RAID cards and OEM-keyed drives are common in pulled stock and are functionally worthless outside their original platform. Ask about lock status explicitly; a seller who does not understand the question is a reseller, not a builder.
  • AMD SP5 socket and processor carrier frameAMD SP5 插座与处理器载具
    Facility systemsHS 8536.90per pc / setCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • ES/QS samples sold as retail 散片. Intel states engineering samples remain Intel property, are supplied under NDA or special loan terms, and are not for sale or resale. Identification: no brand string or base-frequency marking on the IHS, an 'Intel Confidential' label, or a four/five-digit Q-spec where a production part carries a five-digit S-spec. ES 不显 parts show 0000 in CPU-Z; ES 正显 and QS parts display correct strings and are the ones that actually fool buyers. QS is stepping-identical to retail and often perfectly stable — which is exactly why it is sold as retail. Neither carries warranty and neither can support an enterprise RMA obligation.
    • AMD Platform Secure Boot vendor lock. When PSB is enabled on an OEM platform, one-time fuses permanently bind the CPU to that vendor's BIOS signing key. A Dell-locked EPYC will not POST on a Supermicro or Gigabyte board, and the fusing is irreversible. A large share of cheap EPYC 7003/9004 secondary stock is locked, and the seller frequently does not know or does not say. Make it an explicit RFQ field and demand video proof of POST on a generic board.
    • Tray processors quoted with implied manufacturer warranty. Intel warrants boxed processors (typically three years, some one year); tray processors sold by resellers or system builders carry no Intel warranty at all — the only warranty is the reseller's. Chinese quotes for 散片 routinely say '原厂保三年' when the part is tray. Ask who honours the warranty by name.
    • 拆机 pulls sold as new. Decommissioned hyperscaler and enterprise fleets feed an enormous pull market in both CPUs and DIMMs. The parts are often genuine and often fine — the fraud is grade misrepresentation. Tells: contact-pad wear or discoloration on the CPU underside, cured thermal compound residue, missing carrier clips, loose ESD bagging instead of manufacturer trays, and wide manufacture-date spread across a single lot.
    • Label-vs-SPD mismatch on DDR5 modules. Counterfeiters batch-print thousands of identical labels with the same serial number but cannot rewrite the serial stored in each module's SPD hub. If the software-read serial differs from the printed one, the module is counterfeit. CRC errors, 'Generic' or 'Unknown' manufacturer fields, or SPD parameters that contradict the claimed speed bin all indicate crude SPD tampering.
    • Ground-off and remarked DRAM dies. A common construction is server-decommissioned downgraded chips or cheap clone dies with original markings ground away and a counterfeit vendor label applied. Defence: photograph the FBGA marking on the DRAM packages and run it through Micron's official FBGA decoder or SK hynix's part-number decoder, then confirm the resulting die matches the claimed module MPN and speed bin.
    • '128GB DDR5 RDIMM' hiding two different products. The same capacity is built either as 2Rx4 on 32Gb monolithic dies or as 4Rx4 TSV 3DS. They differ in price, achievable speed, channel loading and platform support. A quote that states only capacity and speed is not comparable to another quote of the same nominal spec.
  • Analogue linear heat sensing cable (integrating type)感温电缆（模拟量/线型定温+差温）
    Facility systemsHS 8531.10per mCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Arc flash detection and mitigation relay弧光保护装置 / 电弧光保护系统
    Facility systemsHS 9030.89per systemCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • kVA quoted where kW is meant. A 500 kVA UPS at 0.9 output power factor delivers 450 kW. Chinese modular UPS is now usually unity-PF, but older platforms and cheap bids are not, and the 10% gap is invisible until commissioning. Always demand both numbers and the output PF.
    • Battery quoted in ampere-hours. UPS batteries are sized in watts per cell at a specified end voltage for a specified time, because data centre autonomies are short and high-rate. An Ah figure tells you almost nothing about whether the string will hold the load for 10 minutes. A supplier who quotes only Ah either does not understand UPS duty or is hoping you do not.
    • Autonomy quoted at nameplate, not at end of life or at the real ambient. Ten minutes at a new battery at 25 C can be six or seven minutes at end of warranty in a 35 C battery room. Specify the sizing conditions in the RFQ.
    • Transformer losses that fail EU Ecodesign Tier 2. The standard Chinese SCB13 dry-type is a fine transformer that in many ratings simply cannot be legally placed on the EU market under Regulation (EU) 548/2014 as amended by 2019/1783. Buyers discover this after the letter of credit is open. Ask for guaranteed watt figures, not a class name, and check them against the regulation before ordering.
    • SF6 ring main units quoted into the EU. The F-gas Regulation (EU) 2024/573 restricts new SF6 MV switchgear placed on the EU market. A Chinese supplier's default RMU is SF6. The SF6-free alternative exists but Chinese depth in it is much thinner and the type-test evidence is often a family read-across rather than a test of the quoted model.
    • Genset emission tier assumed transferable. India's CPCB IV+ has applied to DG sets since July 2023 and disqualifies most Chinese-packaged engines outright. EU Stage V and US EPA Tier 4 are separate hurdles again. An engine certified for the Chinese domestic non-road standard is not installable in these markets, and no amount of documentation fixes it after shipment. This is the single most expensive mistake in the category.
    • Busway quoted without a common routing drawing. Straight lengths are the cheap, easy-to-compare part. Elbows, tees, offsets, expansion joints, fire barriers, end feeds and hangers frequently exceed the cost of the straights and vary enormously between bidders reading the same layout differently. Issue one routing drawing revision and require an itemised bill of fittings against it, or the tender is theatre.
  • As-built rack elevation drawing and cable schedule机柜竣工立面图与线缆表
    Facility systemsper per rackCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • ASD capillary sampling points and cone samplers毛细管采样点 / 采样孔锥
    Facility systemsHS 3917.32per pcCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • ASD sampling pipe network (pipe, fittings, end caps)采样管网（ABS/PVC 管、管件、末端帽）
    Facility systemsHS 3917.23per m / setCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • ASD single-pipe / cabinet or in-rack micro sampling unit单管吸气式探测器 / 机柜级极早期探测
    Facility systemsHS 8531.10per unitCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Aspirating smoke detection (air-sampling) for liquid-cooled halls吸气式感烟火灾探测系统 液冷机房
    Facility systemsHS 8531.10per systemCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • Capacity quoted without an approach temperature. This is the single biggest trap in CDU sourcing. A CDU rated '800 kW' at a 5 K approach may deliver only 500-550 kW at the 3 K approach your design actually needs. Two quotes are not comparable until both state the approach.
    • Air-cooling capacity quoted at a 35C return-air temperature. Chinese precision-AC datasheets commonly use a warmer return condition than Western practice, which inflates the sensible kW by 20-30%. Always restate the capacity at your own hall condition.
    • Sensible versus total cooling capacity. A total-cooling number includes latent capacity you will never use in a data centre. Insist on sensible-only.
    • Pump curves given on water at 20C when the fluid is 25% glycol at 45C. The viscosity penalty is real and vendors rarely volunteer the corrected curve. Your flow will be short and nobody will know why until commissioning.
    • 'Supports Modbus' with no register map supplied. This is near-universal among Chinese CDU vendors and it strands the DCIM integration for months. Make the documented register map, BACnet object list and SNMP MIB explicit PO deliverables with payment tied to them.
    • Filter micron ratings quoted as nominal, not absolute. A 50-micron nominal filter passes particles that block a 0.3 mm microchannel cold plate. Specify absolute and demand the beta ratio.
    • Coolant sold as concentrate and diluted on site with local tap water. This destroys the inhibitor package, introduces chlorides and hardness, and is the most common root cause of first-year corrosion in Chinese liquid-cooling installations. Buy premixed with DI water, in sealed IBCs.
  • Aspirating smoke detection system (VESDA-type)极早期烟雾探测系统（吸气式）
    Facility systemsHS 8531.10per systemCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • The 'manufacturer' that is a trading company. On Alibaba and Made-in-China this is the default state for racks, containment, rack PDUs, cabling and small cooling accessories. The distinguishing evidence: (a) 经营范围 in the business licence says 销售/贸易 but not 生产; (b) the 'factory address' equals the registered office and is in an office tower, not an industrial park; (c) no 生产许可 or product certification is held in the seller's own name — certificates show a different company; (d) they are not in any CIOE/China Refrigeration/CDCC exhibitor list; (e) they quote across five unrelated categories. Always cross-check the 统一社会信用代码 on gsxt.gov.cn.
    • The reverse trap: assuming a trader is always bad. For a 20-line mixed BOM, a competent Guangdong trading company is often the only party that will handle consolidation, export documentation and one invoice. The trap is paying manufacturer margins for trader service, or letting the trader hide who actually made the goods so warranty has no counterparty.
    • Cooling capacity quoted at undeclared conditions. A '100 kW' CRAH at 15/21C chilled water is a different machine from a '100 kW' CRAH at 12/18C, and a '35 kW' passive rear door at 12C water is not the same product as one at 18C. Chinese quotes routinely omit the conditions and Western buyers routinely compare the headline number.
    • CDU kW ratings with only one loop temperature. A CDU is defined by primary in, primary out, secondary in, secondary out and both flow rates. A single number is not a specification and cannot be compared across vendors.
    • Residual air heat in liquid-cooled racks. Vendors state '90% heat captured to liquid' and buyers size the room for 10%. In practice the uncaptured fraction is often 15-25% under real workloads, and a 120 kW rack then dumps 25 kW into a hall designed for 12. Ask for kW of residual air heat per chassis, in writing.
    • Filled floor loading for immersion tanks. A filled immersion tank can exceed 2,000 kg/m2. Chinese quotes give the dry weight. The building, not the tank, is what fails.
    • Aluminium substituted for copper in busbar, busway and switchgear. It is legal, it meets the current rating, and it is not what the buyer priced. Specify conductor material and cross-section, and weigh a sample on arrival.
  • Aspirating smoke detector (ASD), multi-pipe VESDA-class吸气式感烟火灾探测器（极早期烟雾探测）
    Facility systemsHS 8531.10per unitCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Asset labelling, barcode and pre-configuration service资产标签与预配置服务
    Facility systemsper lotCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • 'OEM' means the opposite of what you think. A Chinese seller saying OEM almost always means 代工/贴牌 — they will build or relabel to your spec, with no brand IP behind it. A Western buyer hears 'made by Dell/HPE'. Never accept the word; ask which factory designed the board and which built it, and get FCC ID / CMIIT ID and PCB silkscreen photos.
    • Engineering samples sold as production silicon. ES/QS CPUs are typically 30-50% below retail, carry no vendor warranty, and can be unstable in specific workloads. Intel states the S-spec is printed only on the IHS, that 'Intel Confidential' or a missing brand string identifies an ES, and that it may retain or destroy re-marked product. QS is nearer retail but is still a sample. Demand IHS photos and an ES/QS exclusion clause with lot-level return.
    • 拆机件 sold as new. Decommissioned DDR4 RDIMMs, RAID cards and drives are a huge, largely legitimate market — the fraud is the relabelling. Refurbishers are documented as resurfacing bad sectors, zeroing power-on hours and swapping model labels. Require original sealed packaging, single-lot date codes, and per-unit health logs.
    • SMART is not proof of a new drive. Commercial tools reset SMART attributes to factory defaults in one click. On Seagate drives the FARM log is a second, harder-to-scrub record: FARM hours exceeding SMART hours indicates tampering. On SSDs, firmware can misreport capacity and health outright, so a clean SMART page means very little.
    • Altered labels defeat verification portals. Scammers copy serials from newer drives onto old units and reprint QR codes so that vendor verification appears to pass. Verify serials yourself at the OEM portal (verify.seagate.com, cway.cisco.com/sncheck, Intel's FPO/ATPO lookup), and cross-check that the serial's warranty start date is consistent with a genuinely new unit.
    • Remarked memory. A DDR5-4800 module relabelled as 6400, or SK hynix dies under a Samsung label, is caught only by comparing three layers: printed module label, SPD dump, and the die markings on the chips themselves. Any disagreement across those three is disqualifying.
    • Vendor-locked parts that boot nowhere. AMD PSB-locked EPYCs, crossflashed RAID cards and OEM-keyed drives are common in pulled stock and are functionally worthless outside their original platform. Ask about lock status explicitly; a seller who does not understand the question is a reseller, not a builder.
  • Authorized / Approved IC Designer application (§740.27 AIA prerequisite)授权集成电路设计者资格申请
    Facility systemsper applicationCN supply: not made in China
    unrestricted
    7 ways buyers get burned here
    • Assuming 'not US-origin' means 'not subject to the EAR'. The Advanced Computing FDPR at 734.9(h) captures foreign-produced 3A090/4A090/.z items made with listed US technology or software, or on a plant derived from it. That covers essentially all leading-edge logic on earth. De minimis analysis never even begins for an FDPR-captured item.
    • Assuming a Chinese trading company can lawfully resell a controlled accelerator abroad. It cannot: 742.6(b)(10)(iii) is presumption of denial for all reexports and for D:5/Macau-headquartered entities, and License Exception ACA at 740.8 expressly excludes entities headquartered in — or ultimately parented in — D:5 or Macau. There is no structure that fixes this.
    • Reading the January 2026 case-by-case rule as 'H200 is now sellable to China'. It permits a LICENSED US EXPORTER to apply, with four certifications including a 50%-of-US-volume cap and mandatory independent US-lab pre-export verification. It changed nothing about reexport from China, and left presumption of denial fully intact for D:5/Macau-headquartered buyers.
    • Believing the AI Diffusion Rule was rescinded and its machinery is gone. It was never rescinded in the Federal Register: 740.27 (AIA), 740.28 (ACM), 740.29 (LPP), Supplement 5 to Part 740 and the 790,000,000 TPP country allocations are all still codified at 2026-09-01. BIS announced non-enforcement of its NEW requirements in May 2025, but the 2026-05-31 guidance confirms the pre-existing November-2023 headquarters-based licence requirement IS enforced, and the 2026-06-17 FAQ extends it to .z items.
    • Treating the Affiliates Rule as dead. It is STAYED, not repealed — 2025-19846 stays the 2025-09-30 IFR until 2026-11-09, roughly two months from now. Build the 50%-ownership aggregation logic now behind a flag. Note also that FDPR footnote 5 already carries its own surviving 50%-ownership provision, and OFAC's own 50% Rule never went away.
    • Screening the brand instead of the legal entity. Entity List designations are entity-specific: 'Inspur (Beijing) Electronic Information Industry' is listed while other Inspur group companies are not, and several distinct Fudan Microelectronics entities were listed separately in September 2025. Screen the unified social credit code on the contract, plus every alias.
    • Ignoring alias sprawl. The September 2025 additions show entities with up to sixteen aliases, and the four NetForward / Nanfei entities were listed across four cities. A single-string name match will miss most of them.
  • Backplane power and sideband cable set (SGPIO/I2C)背板供电与边带信号线组
    Facility systemsHS 8544.42per setCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • REFURBISHED DRIVES WITH RESET SMART. The 2025 Seagate scandal saw drives with tens of thousands of hours sold as new after SMART counters were zeroed. RFQ defence: demand `smartctl -l farm` output (smartmontools 7.4+) on 3 random units — Seagate FARM (Field Accessible Reliability Metrics) records Power-on Hours and Head Flight Hours independently and is not resettable by the tools fraudsters use. A FARM/SMART mismatch is proof, not suspicion.
    • THE POWER-CYCLE TELL. Even without FARM, a reset drive gives itself away: 2 power-on hours against 2,400 power cycles is impossible for a genuinely new drive. Always ask for power-on hours AND power cycle count AND Percentage Used together — resetters usually zero one field and forget the others.
    • COUNTERFEIT CAPACITY. SSD firmware is modified to report far more capacity than the physical NAND holds; the drive writes normally until it wraps and silently corrupts. RFQ defence: require a full-span write-then-verify test (h2testw or `badblocks -w`) on a sample, plus the flash-ID readout showing die count and per-die capacity.
    • DRAM-LESS CONTROLLERS SOLD AS ENTERPRISE. Especially in M.2 2280 and cheap U.2. RFQ defence: ask for onboard DRAM size in GB (expect roughly 1GB per 1TB NAND), reject HMB, and demand high-resolution photos of both PCB faces — a DRAM package is visible or it is not there.
    • FIRMWARE-ONLY 'PLP'. Sellers claim power loss protection with no capacitors. RFQ defence: ask for capacitor type and count and have them pointed out in the board photo; ask for JESD218 power-cycling test results. Real hardware PLP is physically countable.
    • M.2 2280 'WITH PLP'. 80mm boards rarely have room for a real capacitor bank; 22110 exists precisely because 110mm does. A 2280 PLP claim needs a board photo before it is believed.
    • THE NEARLINE HDD 'MANUFACTURER'. No PRC company manufactures hard disk drives. Only Seagate, Western Digital and Toshiba do. Any Chinese seller describing itself as the factory for 20-32TB nearline drives is a trader, relabeller or refurbisher. RFQ defence: ask for the OEM part number and an authorisation letter or upstream purchase invoice, and state in the question that you know no PRC manufacturer exists.
  • BACnet MS/TP field controller (DDC) for mechanical plantBACnet MS/TP 现场控制器 / DDC
    Facility systemsHS 9032.89per pcCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Battery-compartment H2 detection and emergency ventilation电池舱氢气探测及事故排风系统
    Facility systemsHS 9027.10 / 8414.59contestedper systemCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Cooling sized at 25 °C, not at your real ambient. Chinese vendors habitually publish nominal cooling capacity at benign conditions. A DX in-row unit rated 40 kW at 35 °C outdoor may deliver 26–30 kW at 48 °C in the Gulf, and its condenser may trip on high pressure entirely. Demand the capacity table at YOUR site design ambient (dry bulb and wet bulb, 0.4% ASHRAE annual percentile), and make the derated figure the contractual number.
    • 'IP55' that is IP55 only on the shell. Aipu-Waton's own literature confirms IP65 is a customisation, not a default. Louvres, cable entries, condenser openings and door seals are where ingress actually happens. In sandstorm or coastal environments specify the filtration class (G4/F7), the coating system (C5-M per ISO 12944 for marine), and require an ingress test report on the assembled unit, not a component certificate.
    • No UL 2755 certification for a North American destination. UL 2755:2025 is the Outline of Investigation that US and Canadian AHJs now reference for prefabricated modular data centre systems. Almost no Chinese factory holds it as standard, and obtaining it retrospectively means factory inspection plus rework. Ask for the certificate number and the certifying body (UL Solutions, Intertek or CSA) before, not after, the PO.
    • Component CE certificates presented as an assembly CE mark. There is no unitary CE mark for a modular data centre. What is required is a technical file combining LVD, EMC, Machinery Directive (for moving parts), pressure equipment (for the cooling circuit), and construction product evidence for the enclosure, plus a Declaration of Conformity naming the assembly. A folder of supplier CE certificates for the UPS and the AC unit is not that.
    • Standards mismatch that voids your local design code. GB 50174-2017 explicitly excludes outdoor container-based facilities from its scope. If a supplier cites GB 50174 compliance for a container product, they are citing the wrong standard — the applicable Chinese document is GB/T 36448-2018, with GB/T 1413 and GB/T 5338 for the box itself. Neither maps cleanly onto EN 50600 or the Uptime Institute Tier system, and a container is very hard to certify as Tier III concurrently maintainable.
    • Rated payload exceeded, silently. A 40HQ has a rated payload around 26–28 t. A fully fitted 40ft data centre with racks, UPS, batteries, transformer and a filled liquid loop routinely exceeds it. The unit then cannot be stowed as ordinary FCL, cannot be lifted by standard terminal equipment, and cannot legally travel on many roads. Get the weight certificate — dry, and wet-and-populated — in writing before booking freight.
    • Out-of-gauge cargo discovered after signing. Anything wider than 2438 mm or taller than 2896 mm is out-of-gauge: flat-rack or breakbulk stowage, special handling, route survey, escorts and permits. Huawei's FusionDC1000B core module at 3600 mm high is already in this category. On difficult inland routes the freight and permit cost can approach the module price. Establish the transport envelope before the technical spec is frozen.
  • BIOS/BMC pre-flash and firmware programming serviceBIOS/BMC固件预烧录服务
    Facility systemsper per unitCN supply: moderate
    unrestricted
    11 questions ready11 of them decide comparabilitysee the question set →
    7 ways buyers get burned here
    • Depth is quoted without the bezel, ears, CMA or rear cable bend radius. A '798 mm' 2U server needs roughly 950-1000 mm of usable rack depth once mounted and cabled - which is why full-depth AI nodes do not belong in 1000 mm racks. Always ask for front-post-to-rear clearance, not chassis depth.
    • Rail kits and CMAs excluded from the system price without saying so. Two 'identical' server quotes can differ by the cost of rails, and the cheaper one arrives unmountable.
    • Rail load rating quoted as the static figure only. The number that matters is the rating at full extension. An 8U 130 kg GPU node exceeds ordinary ~38-45 kg kits by roughly 3x, and the failure happens the first time someone slides it out.
    • Physical x16 PCIe slots wired electrically x8, or slots that only exist when an optional riser is purchased. Demand a per-slot map: generation, electrical width, physical width, height and riser dependency.
    • PCIe Gen5 risers and cable kits sold without retimers or without an insertion-loss budget. The link trains at Gen4 or fails intermittently under load. Retimers and redrivers are not interchangeable - only protocol-aware retiming rescues a long channel.
    • Backplane described as '24-bay NVMe' when it is actually expander-attached and shares a fraction of the bandwidth. Direct-attach vs expander is the single largest hidden performance and price variable in storage servers.
    • CRPS / CRPS2 / M-CRPS power supplies that fit the same bay but use different pinouts. The PSU seats perfectly and the system will not power on.
  • BIOS/BMC settings profile (as a contracted deliverable)BIOS/BMC参数模板（作为交付物）
    Facility systemsper per projectCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • BIOS/UEFI firmware stackBIOS/UEFI固件
    Facility systemsper licence/projectCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • BMC firmware stack / licenceBMC固件（授权）
    Facility systemsper licence/projectCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • BMC / management module (AST-based)BMC管理模块
    Facility systemsHS 8473.30per pcCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • 'OEM' means the opposite of what you think. A Chinese seller saying OEM almost always means 代工/贴牌 — they will build or relabel to your spec, with no brand IP behind it. A Western buyer hears 'made by Dell/HPE'. Never accept the word; ask which factory designed the board and which built it, and get FCC ID / CMIIT ID and PCB silkscreen photos.
    • Engineering samples sold as production silicon. ES/QS CPUs are typically 30-50% below retail, carry no vendor warranty, and can be unstable in specific workloads. Intel states the S-spec is printed only on the IHS, that 'Intel Confidential' or a missing brand string identifies an ES, and that it may retain or destroy re-marked product. QS is nearer retail but is still a sample. Demand IHS photos and an ES/QS exclusion clause with lot-level return.
    • 拆机件 sold as new. Decommissioned DDR4 RDIMMs, RAID cards and drives are a huge, largely legitimate market — the fraud is the relabelling. Refurbishers are documented as resurfacing bad sectors, zeroing power-on hours and swapping model labels. Require original sealed packaging, single-lot date codes, and per-unit health logs.
    • SMART is not proof of a new drive. Commercial tools reset SMART attributes to factory defaults in one click. On Seagate drives the FARM log is a second, harder-to-scrub record: FARM hours exceeding SMART hours indicates tampering. On SSDs, firmware can misreport capacity and health outright, so a clean SMART page means very little.
    • Altered labels defeat verification portals. Scammers copy serials from newer drives onto old units and reprint QR codes so that vendor verification appears to pass. Verify serials yourself at the OEM portal (verify.seagate.com, cway.cisco.com/sncheck, Intel's FPO/ATPO lookup), and cross-check that the serial's warranty start date is consistent with a genuinely new unit.
    • Remarked memory. A DDR5-4800 module relabelled as 6400, or SK hynix dies under a Samsung label, is caught only by comparing three layers: printed module label, SPD dump, and the die markings on the chips themselves. Any disagreement across those three is disqualifying.
    • Vendor-locked parts that boot nowhere. AMD PSB-locked EPYCs, crossflashed RAID cards and OEM-keyed drives are common in pulled stock and are functionally worthless outside their original platform. Ask about lock status explicitly; a seller who does not understand the question is a reseller, not a builder.
  • BMC SoC — ASPEED AST2600BMC管理芯片 AST2600
    Facility systemsHS 8542.31per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • BMC SoC — HiSilicon Hi1711BMC管理芯片 海思Hi1711
    Facility systemsHS 8542.31per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • BMC SoC — Phytium Tenglong E2000 seriesBMC管理芯片 飞腾腾珑E2000
    Facility systemsHS 8542.31per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Branch circuit monitoring / EPMS multi-circuit meter多回路电力仪表 / 智能电量采集终端
    Facility systemsHS 9030.89per unitCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Burn-in and diagnostics service with report老化测试与诊断服务
    Facility systemsper per unit / per rackCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Busbar joint and connection thermal monitoring (wireless)母线接头无线测温装置 / 无线温度监测
    Facility systemsHS 9025.19per sensor + receiverCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • kVA quoted where kW is meant. A 500 kVA UPS at 0.9 output power factor delivers 450 kW. Chinese modular UPS is now usually unity-PF, but older platforms and cheap bids are not, and the 10% gap is invisible until commissioning. Always demand both numbers and the output PF.
    • Battery quoted in ampere-hours. UPS batteries are sized in watts per cell at a specified end voltage for a specified time, because data centre autonomies are short and high-rate. An Ah figure tells you almost nothing about whether the string will hold the load for 10 minutes. A supplier who quotes only Ah either does not understand UPS duty or is hoping you do not.
    • Autonomy quoted at nameplate, not at end of life or at the real ambient. Ten minutes at a new battery at 25 C can be six or seven minutes at end of warranty in a 35 C battery room. Specify the sizing conditions in the RFQ.
    • Transformer losses that fail EU Ecodesign Tier 2. The standard Chinese SCB13 dry-type is a fine transformer that in many ratings simply cannot be legally placed on the EU market under Regulation (EU) 548/2014 as amended by 2019/1783. Buyers discover this after the letter of credit is open. Ask for guaranteed watt figures, not a class name, and check them against the regulation before ordering.
    • SF6 ring main units quoted into the EU. The F-gas Regulation (EU) 2024/573 restricts new SF6 MV switchgear placed on the EU market. A Chinese supplier's default RMU is SF6. The SF6-free alternative exists but Chinese depth in it is much thinner and the type-test evidence is often a family read-across rather than a test of the quoted model.
    • Genset emission tier assumed transferable. India's CPCB IV+ has applied to DG sets since July 2023 and disqualifies most Chinese-packaged engines outright. EU Stage V and US EPA Tier 4 are separate hurdles again. An engine certified for the Chinese domestic non-road standard is not installable in these markets, and no amount of documentation fixes it after shipment. This is the single most expensive mistake in the category.
    • Busway quoted without a common routing drawing. Straight lengths are the cheap, easy-to-compare part. Elbows, tees, offsets, expansion joints, fire barriers, end feeds and hangers frequently exceed the cost of the straights and vary enormously between bidders reading the same layout differently. Issue one routing drawing revision and require an itemised bill of fittings against it, or the tender is theatre.
  • Card and biometric reader读卡器 / 生物识别读头
    Facility systemsHS 8543.70per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • CCATS commodity classification request (SNAP-R)BIS 商品分类裁定 (CCATS)
    Facility systemsper requestCN supply: not made in China
    unrestricted
    7 ways buyers get burned here
    • Assuming 'not US-origin' means 'not subject to the EAR'. The Advanced Computing FDPR at 734.9(h) captures foreign-produced 3A090/4A090/.z items made with listed US technology or software, or on a plant derived from it. That covers essentially all leading-edge logic on earth. De minimis analysis never even begins for an FDPR-captured item.
    • Assuming a Chinese trading company can lawfully resell a controlled accelerator abroad. It cannot: 742.6(b)(10)(iii) is presumption of denial for all reexports and for D:5/Macau-headquartered entities, and License Exception ACA at 740.8 expressly excludes entities headquartered in — or ultimately parented in — D:5 or Macau. There is no structure that fixes this.
    • Reading the January 2026 case-by-case rule as 'H200 is now sellable to China'. It permits a LICENSED US EXPORTER to apply, with four certifications including a 50%-of-US-volume cap and mandatory independent US-lab pre-export verification. It changed nothing about reexport from China, and left presumption of denial fully intact for D:5/Macau-headquartered buyers.
    • Believing the AI Diffusion Rule was rescinded and its machinery is gone. It was never rescinded in the Federal Register: 740.27 (AIA), 740.28 (ACM), 740.29 (LPP), Supplement 5 to Part 740 and the 790,000,000 TPP country allocations are all still codified at 2026-09-01. BIS announced non-enforcement of its NEW requirements in May 2025, but the 2026-05-31 guidance confirms the pre-existing November-2023 headquarters-based licence requirement IS enforced, and the 2026-06-17 FAQ extends it to .z items.
    • Treating the Affiliates Rule as dead. It is STAYED, not repealed — 2025-19846 stays the 2025-09-30 IFR until 2026-11-09, roughly two months from now. Build the 50%-ownership aggregation logic now behind a flag. Note also that FDPR footnote 5 already carries its own surviving 50%-ownership provision, and OFAC's own 50% Rule never went away.
    • Screening the brand instead of the legal entity. Entity List designations are entity-specific: 'Inspur (Beijing) Electronic Information Industry' is listed while other Inspur group companies are not, and several distinct Fudan Microelectronics entities were listed separately in September 2025. Screen the unified social credit code on the contract, plus every alias.
    • Ignoring alias sprawl. The September 2025 additions show entities with up to sixteen aliases, and the four NetForward / Nanfei entities were listed across four cities. A single-string name match will miss most of them.
  • Chassis intrusion switch and lockable front bezel机箱防拆开关/带锁前面板
    Facility systemsHS 8473.30per pcCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Chassis management / BMC module机箱管理模块 (BMC/OM)
    Facility systemsHS 8473.30per moduleCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Depth is quoted without the bezel, ears, CMA or rear cable bend radius. A '798 mm' 2U server needs roughly 950-1000 mm of usable rack depth once mounted and cabled - which is why full-depth AI nodes do not belong in 1000 mm racks. Always ask for front-post-to-rear clearance, not chassis depth.
    • Rail kits and CMAs excluded from the system price without saying so. Two 'identical' server quotes can differ by the cost of rails, and the cheaper one arrives unmountable.
    • Rail load rating quoted as the static figure only. The number that matters is the rating at full extension. An 8U 130 kg GPU node exceeds ordinary ~38-45 kg kits by roughly 3x, and the failure happens the first time someone slides it out.
    • Physical x16 PCIe slots wired electrically x8, or slots that only exist when an optional riser is purchased. Demand a per-slot map: generation, electrical width, physical width, height and riser dependency.
    • PCIe Gen5 risers and cable kits sold without retimers or without an insertion-loss budget. The link trains at Gen4 or fails intermittently under load. Retimers and redrivers are not interchangeable - only protocol-aware retiming rescues a long channel.
    • Backplane described as '24-bay NVMe' when it is actually expander-attached and shares a fraction of the bandwidth. Direct-attach vs expander is the single largest hidden performance and price variable in storage servers.
    • CRPS / CRPS2 / M-CRPS power supplies that fit the same bay but use different pinouts. The PSU seats perfectly and the system will not power on.
  • Clean-agent fire suppression system (IG-541 / HFC-227ea / FK-5-1-12)气体灭火系统（IG-541/七氟丙烷/全氟己酮）
    Facility systemsHS 8424.10per systemCN supply: dominant
    classify first

    FK-5-1-12 and HFC agents carry PFAS/F-gas exposure in the EU. IG-541 (inert) avoids it but needs far more cylinder space — a layout, not a price, decision.

    7 ways buyers get burned here
    • The 'manufacturer' that is a trading company. On Alibaba and Made-in-China this is the default state for racks, containment, rack PDUs, cabling and small cooling accessories. The distinguishing evidence: (a) 经营范围 in the business licence says 销售/贸易 but not 生产; (b) the 'factory address' equals the registered office and is in an office tower, not an industrial park; (c) no 生产许可 or product certification is held in the seller's own name — certificates show a different company; (d) they are not in any CIOE/China Refrigeration/CDCC exhibitor list; (e) they quote across five unrelated categories. Always cross-check the 统一社会信用代码 on gsxt.gov.cn.
    • The reverse trap: assuming a trader is always bad. For a 20-line mixed BOM, a competent Guangdong trading company is often the only party that will handle consolidation, export documentation and one invoice. The trap is paying manufacturer margins for trader service, or letting the trader hide who actually made the goods so warranty has no counterparty.
    • Cooling capacity quoted at undeclared conditions. A '100 kW' CRAH at 15/21C chilled water is a different machine from a '100 kW' CRAH at 12/18C, and a '35 kW' passive rear door at 12C water is not the same product as one at 18C. Chinese quotes routinely omit the conditions and Western buyers routinely compare the headline number.
    • CDU kW ratings with only one loop temperature. A CDU is defined by primary in, primary out, secondary in, secondary out and both flow rates. A single number is not a specification and cannot be compared across vendors.
    • Residual air heat in liquid-cooled racks. Vendors state '90% heat captured to liquid' and buyers size the room for 10%. In practice the uncaptured fraction is often 15-25% under real workloads, and a 120 kW rack then dumps 25 kW into a hall designed for 12. Ask for kW of residual air heat per chassis, in writing.
    • Filled floor loading for immersion tanks. A filled immersion tank can exceed 2,000 kg/m2. Chinese quotes give the dry weight. The building, not the tank, is what fails.
    • Aluminium substituted for copper in busbar, busway and switchgear. It is legal, it meets the current rating, and it is not what the buyer priced. Specify conductor material and cross-section, and weigh a sample on arrival.
  • Console cable set and USB-serial adaptersConsole 线缆与 USB 转串口适配器
    Facility systemsHS 8544.42 / 8473.30contestedper setCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • Cooling group / plant control DDC controller and sequencing panel冷源群控系统 / 冷站群控柜
    Facility systemsHS 8537.10per systemCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Capacity quoted without an approach temperature. This is the single biggest trap in CDU sourcing. A CDU rated '800 kW' at a 5 K approach may deliver only 500-550 kW at the 3 K approach your design actually needs. Two quotes are not comparable until both state the approach.
    • Air-cooling capacity quoted at a 35C return-air temperature. Chinese precision-AC datasheets commonly use a warmer return condition than Western practice, which inflates the sensible kW by 20-30%. Always restate the capacity at your own hall condition.
    • Sensible versus total cooling capacity. A total-cooling number includes latent capacity you will never use in a data centre. Insist on sensible-only.
    • Pump curves given on water at 20C when the fluid is 25% glycol at 45C. The viscosity penalty is real and vendors rarely volunteer the corrected curve. Your flow will be short and nobody will know why until commissioning.
    • 'Supports Modbus' with no register map supplied. This is near-universal among Chinese CDU vendors and it strands the DCIM integration for months. Make the documented register map, BACnet object list and SNMP MIB explicit PO deliverables with payment tied to them.
    • Filter micron ratings quoted as nominal, not absolute. A 50-micron nominal filter passes particles that block a 0.3 mm microchannel cold plate. Specify absolute and demand the beta ratio.
    • Coolant sold as concentrate and diluted on site with local tap water. This destroys the inhibitor package, introduces chlorides and hardness, and is the most common root cause of first-year corrosion in Chinese liquid-cooling installations. Buy premixed with DI water, in sealed IBCs.
  • Cooling plant energy and water sub-metering package (PUE/WUE reporting grade)冷源系统能耗与水耗计量装置 (PUE/WUE合规)
    Facility systemsHS 9028.30 / 9028.20contestedper packageCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • Capacity quoted without an approach temperature. This is the single biggest trap in CDU sourcing. A CDU rated '800 kW' at a 5 K approach may deliver only 500-550 kW at the 3 K approach your design actually needs. Two quotes are not comparable until both state the approach.
    • Air-cooling capacity quoted at a 35C return-air temperature. Chinese precision-AC datasheets commonly use a warmer return condition than Western practice, which inflates the sensible kW by 20-30%. Always restate the capacity at your own hall condition.
    • Sensible versus total cooling capacity. A total-cooling number includes latent capacity you will never use in a data centre. Insist on sensible-only.
    • Pump curves given on water at 20C when the fluid is 25% glycol at 45C. The viscosity penalty is real and vendors rarely volunteer the corrected curve. Your flow will be short and nobody will know why until commissioning.
    • 'Supports Modbus' with no register map supplied. This is near-universal among Chinese CDU vendors and it strands the DCIM integration for months. Make the documented register map, BACnet object list and SNMP MIB explicit PO deliverables with payment tied to them.
    • Filter micron ratings quoted as nominal, not absolute. A 50-micron nominal filter passes particles that block a 0.3 mm microchannel cold plate. Specify absolute and demand the beta ratio.
    • Coolant sold as concentrate and diluted on site with local tap water. This destroys the inhibitor package, introduces chlorides and hardness, and is the most common root cause of first-year corrosion in Chinese liquid-cooling installations. Buy premixed with DI water, in sealed IBCs.
  • Corrosion monitoring coupons and reactivity monitors腐蚀性气体监测片 / 腐蚀监测仪
    Facility systemsHS 9027.80contestedper setCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • The 'manufacturer' that is a trading company. On Alibaba and Made-in-China this is the default state for racks, containment, rack PDUs, cabling and small cooling accessories. The distinguishing evidence: (a) 经营范围 in the business licence says 销售/贸易 but not 生产; (b) the 'factory address' equals the registered office and is in an office tower, not an industrial park; (c) no 生产许可 or product certification is held in the seller's own name — certificates show a different company; (d) they are not in any CIOE/China Refrigeration/CDCC exhibitor list; (e) they quote across five unrelated categories. Always cross-check the 统一社会信用代码 on gsxt.gov.cn.
    • The reverse trap: assuming a trader is always bad. For a 20-line mixed BOM, a competent Guangdong trading company is often the only party that will handle consolidation, export documentation and one invoice. The trap is paying manufacturer margins for trader service, or letting the trader hide who actually made the goods so warranty has no counterparty.
    • Cooling capacity quoted at undeclared conditions. A '100 kW' CRAH at 15/21C chilled water is a different machine from a '100 kW' CRAH at 12/18C, and a '35 kW' passive rear door at 12C water is not the same product as one at 18C. Chinese quotes routinely omit the conditions and Western buyers routinely compare the headline number.
    • CDU kW ratings with only one loop temperature. A CDU is defined by primary in, primary out, secondary in, secondary out and both flow rates. A single number is not a specification and cannot be compared across vendors.
    • Residual air heat in liquid-cooled racks. Vendors state '90% heat captured to liquid' and buyers size the room for 10%. In practice the uncaptured fraction is often 15-25% under real workloads, and a 120 kW rack then dumps 25 kW into a hall designed for 12. Ask for kW of residual air heat per chassis, in writing.
    • Filled floor loading for immersion tanks. A filled immersion tank can exceed 2,000 kg/m2. Chinese quotes give the dry weight. The building, not the tank, is what fails.
    • Aluminium substituted for copper in busbar, busway and switchgear. It is legal, it meets the current rating, and it is not what the buyer priced. Specify conductor material and cross-section, and weigh a sample on arrival.
  • Country-of-origin marking and packing-list compliance service原产地标识与装箱单合规
    Facility systemsper per shipmentCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • CPU carrier clip, socket-specific (E1A/E1B and SP5 variants)CPU 处理器托架（分TDP等级）
    Facility systemsHS 8536.90per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • ES/QS samples sold as retail 散片. Intel states engineering samples remain Intel property, are supplied under NDA or special loan terms, and are not for sale or resale. Identification: no brand string or base-frequency marking on the IHS, an 'Intel Confidential' label, or a four/five-digit Q-spec where a production part carries a five-digit S-spec. ES 不显 parts show 0000 in CPU-Z; ES 正显 and QS parts display correct strings and are the ones that actually fool buyers. QS is stepping-identical to retail and often perfectly stable — which is exactly why it is sold as retail. Neither carries warranty and neither can support an enterprise RMA obligation.
    • AMD Platform Secure Boot vendor lock. When PSB is enabled on an OEM platform, one-time fuses permanently bind the CPU to that vendor's BIOS signing key. A Dell-locked EPYC will not POST on a Supermicro or Gigabyte board, and the fusing is irreversible. A large share of cheap EPYC 7003/9004 secondary stock is locked, and the seller frequently does not know or does not say. Make it an explicit RFQ field and demand video proof of POST on a generic board.
    • Tray processors quoted with implied manufacturer warranty. Intel warrants boxed processors (typically three years, some one year); tray processors sold by resellers or system builders carry no Intel warranty at all — the only warranty is the reseller's. Chinese quotes for 散片 routinely say '原厂保三年' when the part is tray. Ask who honours the warranty by name.
    • 拆机 pulls sold as new. Decommissioned hyperscaler and enterprise fleets feed an enormous pull market in both CPUs and DIMMs. The parts are often genuine and often fine — the fraud is grade misrepresentation. Tells: contact-pad wear or discoloration on the CPU underside, cured thermal compound residue, missing carrier clips, loose ESD bagging instead of manufacturer trays, and wide manufacture-date spread across a single lot.
    • Label-vs-SPD mismatch on DDR5 modules. Counterfeiters batch-print thousands of identical labels with the same serial number but cannot rewrite the serial stored in each module's SPD hub. If the software-read serial differs from the printed one, the module is counterfeit. CRC errors, 'Generic' or 'Unknown' manufacturer fields, or SPD parameters that contradict the claimed speed bin all indicate crude SPD tampering.
    • Ground-off and remarked DRAM dies. A common construction is server-decommissioned downgraded chips or cheap clone dies with original markings ground away and a counterfeit vendor label applied. Defence: photograph the FBGA marking on the DRAM packages and run it through Micron's official FBGA decoder or SK hynix's part-number decoder, then confirm the resulting die matches the claimed module MPN and speed bin.
    • '128GB DDR5 RDIMM' hiding two different products. The same capacity is built either as 2Rx4 on 32Gb monolithic dies or as 4Rx4 TSV 3DS. They differ in price, achievable speed, channel loading and platform support. A quote that states only capacity and speed is not comparable to another quote of the same nominal spec.
  • CPU socket protective dust cover / capCPU 插座防尘保护盖
    Facility systemsHS 3926.90per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • ES/QS samples sold as retail 散片. Intel states engineering samples remain Intel property, are supplied under NDA or special loan terms, and are not for sale or resale. Identification: no brand string or base-frequency marking on the IHS, an 'Intel Confidential' label, or a four/five-digit Q-spec where a production part carries a five-digit S-spec. ES 不显 parts show 0000 in CPU-Z; ES 正显 and QS parts display correct strings and are the ones that actually fool buyers. QS is stepping-identical to retail and often perfectly stable — which is exactly why it is sold as retail. Neither carries warranty and neither can support an enterprise RMA obligation.
    • AMD Platform Secure Boot vendor lock. When PSB is enabled on an OEM platform, one-time fuses permanently bind the CPU to that vendor's BIOS signing key. A Dell-locked EPYC will not POST on a Supermicro or Gigabyte board, and the fusing is irreversible. A large share of cheap EPYC 7003/9004 secondary stock is locked, and the seller frequently does not know or does not say. Make it an explicit RFQ field and demand video proof of POST on a generic board.
    • Tray processors quoted with implied manufacturer warranty. Intel warrants boxed processors (typically three years, some one year); tray processors sold by resellers or system builders carry no Intel warranty at all — the only warranty is the reseller's. Chinese quotes for 散片 routinely say '原厂保三年' when the part is tray. Ask who honours the warranty by name.
    • 拆机 pulls sold as new. Decommissioned hyperscaler and enterprise fleets feed an enormous pull market in both CPUs and DIMMs. The parts are often genuine and often fine — the fraud is grade misrepresentation. Tells: contact-pad wear or discoloration on the CPU underside, cured thermal compound residue, missing carrier clips, loose ESD bagging instead of manufacturer trays, and wide manufacture-date spread across a single lot.
    • Label-vs-SPD mismatch on DDR5 modules. Counterfeiters batch-print thousands of identical labels with the same serial number but cannot rewrite the serial stored in each module's SPD hub. If the software-read serial differs from the printed one, the module is counterfeit. CRC errors, 'Generic' or 'Unknown' manufacturer fields, or SPD parameters that contradict the claimed speed bin all indicate crude SPD tampering.
    • Ground-off and remarked DRAM dies. A common construction is server-decommissioned downgraded chips or cheap clone dies with original markings ground away and a counterfeit vendor label applied. Defence: photograph the FBGA marking on the DRAM packages and run it through Micron's official FBGA decoder or SK hynix's part-number decoder, then confirm the resulting die matches the claimed module MPN and speed bin.
    • '128GB DDR5 RDIMM' hiding two different products. The same capacity is built either as 2Rx4 on 32Gb monolithic dies or as 4Rx4 TSV 3DS. They differ in price, achievable speed, channel loading and platform support. A quote that states only capacity and speed is not comparable to another quote of the same nominal spec.
  • CPU tray / head node board for GPU platformGPU服务器CPU托板/机头板
    Facility systemsHS 8473.30per trayCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Depth is quoted without the bezel, ears, CMA or rear cable bend radius. A '798 mm' 2U server needs roughly 950-1000 mm of usable rack depth once mounted and cabled - which is why full-depth AI nodes do not belong in 1000 mm racks. Always ask for front-post-to-rear clearance, not chassis depth.
    • Rail kits and CMAs excluded from the system price without saying so. Two 'identical' server quotes can differ by the cost of rails, and the cheaper one arrives unmountable.
    • Rail load rating quoted as the static figure only. The number that matters is the rating at full extension. An 8U 130 kg GPU node exceeds ordinary ~38-45 kg kits by roughly 3x, and the failure happens the first time someone slides it out.
    • Physical x16 PCIe slots wired electrically x8, or slots that only exist when an optional riser is purchased. Demand a per-slot map: generation, electrical width, physical width, height and riser dependency.
    • PCIe Gen5 risers and cable kits sold without retimers or without an insertion-loss budget. The link trains at Gen4 or fails intermittently under load. Retimers and redrivers are not interchangeable - only protocol-aware retiming rescues a long channel.
    • Backplane described as '24-bay NVMe' when it is actually expander-attached and shares a fraction of the bandwidth. Direct-attach vs expander is the single largest hidden performance and price variable in storage servers.
    • CRPS / CRPS2 / M-CRPS power supplies that fit the same bay but use different pinouts. The PSU seats perfectly and the system will not power on.
  • Cybersecurity and network segmentation package for the facility OT network动环/楼控网络 安全隔离与分区
    Facility systemsper deliverableCN supply: weak
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Data Center Validated End User authorization — UVEU / NVEU (Supplement No. 10 to Part 748)数据中心经验证最终用户授权 (UVEU / NVEU)
    Facility systemsper authorizationCN supply: not made in China
    unrestricted
    7 ways buyers get burned here
    • Assuming 'not US-origin' means 'not subject to the EAR'. The Advanced Computing FDPR at 734.9(h) captures foreign-produced 3A090/4A090/.z items made with listed US technology or software, or on a plant derived from it. That covers essentially all leading-edge logic on earth. De minimis analysis never even begins for an FDPR-captured item.
    • Assuming a Chinese trading company can lawfully resell a controlled accelerator abroad. It cannot: 742.6(b)(10)(iii) is presumption of denial for all reexports and for D:5/Macau-headquartered entities, and License Exception ACA at 740.8 expressly excludes entities headquartered in — or ultimately parented in — D:5 or Macau. There is no structure that fixes this.
    • Reading the January 2026 case-by-case rule as 'H200 is now sellable to China'. It permits a LICENSED US EXPORTER to apply, with four certifications including a 50%-of-US-volume cap and mandatory independent US-lab pre-export verification. It changed nothing about reexport from China, and left presumption of denial fully intact for D:5/Macau-headquartered buyers.
    • Believing the AI Diffusion Rule was rescinded and its machinery is gone. It was never rescinded in the Federal Register: 740.27 (AIA), 740.28 (ACM), 740.29 (LPP), Supplement 5 to Part 740 and the 790,000,000 TPP country allocations are all still codified at 2026-09-01. BIS announced non-enforcement of its NEW requirements in May 2025, but the 2026-05-31 guidance confirms the pre-existing November-2023 headquarters-based licence requirement IS enforced, and the 2026-06-17 FAQ extends it to .z items.
    • Treating the Affiliates Rule as dead. It is STAYED, not repealed — 2025-19846 stays the 2025-09-30 IFR until 2026-11-09, roughly two months from now. Build the 50%-ownership aggregation logic now behind a flag. Note also that FDPR footnote 5 already carries its own surviving 50%-ownership provision, and OFAC's own 50% Rule never went away.
    • Screening the brand instead of the legal entity. Entity List designations are entity-specific: 'Inspur (Beijing) Electronic Information Industry' is listed while other Inspur group companies are not, and several distinct Fudan Microelectronics entities were listed separately in September 2025. Screen the unified social credit code on the contract, plus every alias.
    • Ignoring alias sprawl. The September 2025 additions show entities with up to sixteen aliases, and the four NetForward / Nanfei entities were listed across four cities. A single-string name match will miss most of them.
  • Data-centre firewall / DDoS scrubbing appliance数据中心防火墙 / 抗DDoS设备
    Facility systemsHS 8517.62per pcCN supply: moderate
    classify first

    Genuinely different export posture from a switch because of the crypto functionality; quoted throughput is almost always the L4 number

    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • Data-centre physical security package to DC VEU standard符合 DC VEU 标准的数据中心物理安防方案
    Facility systemsper site packageCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Assuming 'not US-origin' means 'not subject to the EAR'. The Advanced Computing FDPR at 734.9(h) captures foreign-produced 3A090/4A090/.z items made with listed US technology or software, or on a plant derived from it. That covers essentially all leading-edge logic on earth. De minimis analysis never even begins for an FDPR-captured item.
    • Assuming a Chinese trading company can lawfully resell a controlled accelerator abroad. It cannot: 742.6(b)(10)(iii) is presumption of denial for all reexports and for D:5/Macau-headquartered entities, and License Exception ACA at 740.8 expressly excludes entities headquartered in — or ultimately parented in — D:5 or Macau. There is no structure that fixes this.
    • Reading the January 2026 case-by-case rule as 'H200 is now sellable to China'. It permits a LICENSED US EXPORTER to apply, with four certifications including a 50%-of-US-volume cap and mandatory independent US-lab pre-export verification. It changed nothing about reexport from China, and left presumption of denial fully intact for D:5/Macau-headquartered buyers.
    • Believing the AI Diffusion Rule was rescinded and its machinery is gone. It was never rescinded in the Federal Register: 740.27 (AIA), 740.28 (ACM), 740.29 (LPP), Supplement 5 to Part 740 and the 790,000,000 TPP country allocations are all still codified at 2026-09-01. BIS announced non-enforcement of its NEW requirements in May 2025, but the 2026-05-31 guidance confirms the pre-existing November-2023 headquarters-based licence requirement IS enforced, and the 2026-06-17 FAQ extends it to .z items.
    • Treating the Affiliates Rule as dead. It is STAYED, not repealed — 2025-19846 stays the 2025-09-30 IFR until 2026-11-09, roughly two months from now. Build the 50%-ownership aggregation logic now behind a flag. Note also that FDPR footnote 5 already carries its own surviving 50%-ownership provision, and OFAC's own 50% Rule never went away.
    • Screening the brand instead of the legal entity. Entity List designations are entity-specific: 'Inspur (Beijing) Electronic Information Industry' is listed while other Inspur group companies are not, and several distinct Fudan Microelectronics entities were listed separately in September 2025. Screen the unified social credit code on the contract, plus every alias.
    • Ignoring alias sprawl. The September 2025 additions show entities with up to sixteen aliases, and the four NetForward / Nanfei entities were listed across four cities. A single-string name match will miss most of them.
  • DCIM / EMS cooling monitoring module with liquid-cooling telemetryDCIM 液冷监控模块
    Facility systemsHS 8523.49contestedper licence/systemCN supply: strong
    classify first

    Data residency and cloud connectivity of Chinese DCIM is a security review item at most Western operators. Insist on a fully on-premises, no-outbound-connection deployment option in writing.

    7 ways buyers get burned here
    • Capacity quoted without an approach temperature. This is the single biggest trap in CDU sourcing. A CDU rated '800 kW' at a 5 K approach may deliver only 500-550 kW at the 3 K approach your design actually needs. Two quotes are not comparable until both state the approach.
    • Air-cooling capacity quoted at a 35C return-air temperature. Chinese precision-AC datasheets commonly use a warmer return condition than Western practice, which inflates the sensible kW by 20-30%. Always restate the capacity at your own hall condition.
    • Sensible versus total cooling capacity. A total-cooling number includes latent capacity you will never use in a data centre. Insist on sensible-only.
    • Pump curves given on water at 20C when the fluid is 25% glycol at 45C. The viscosity penalty is real and vendors rarely volunteer the corrected curve. Your flow will be short and nobody will know why until commissioning.
    • 'Supports Modbus' with no register map supplied. This is near-universal among Chinese CDU vendors and it strands the DCIM integration for months. Make the documented register map, BACnet object list and SNMP MIB explicit PO deliverables with payment tied to them.
    • Filter micron ratings quoted as nominal, not absolute. A 50-micron nominal filter passes particles that block a 0.3 mm microchannel cold plate. Specify absolute and demand the beta ratio.
    • Coolant sold as concentrate and diluted on site with local tap water. This destroys the inhibitor package, introduces chlorides and hardness, and is the most common root cause of first-year corrosion in Chinese liquid-cooling installations. Buy premixed with DI water, in sealed IBCs.
  • DCIM software platform数据中心基础设施管理软件 DCIM
    Facility systemsper licenceCN supply: moderate
    classify first

    Weakest Chinese layer. English localisation is usually machine-translated and incomplete. Ask for a live demo in English against the buyer's own rack layout.

    7 ways buyers get burned here
    • The 'manufacturer' that is a trading company. On Alibaba and Made-in-China this is the default state for racks, containment, rack PDUs, cabling and small cooling accessories. The distinguishing evidence: (a) 经营范围 in the business licence says 销售/贸易 but not 生产; (b) the 'factory address' equals the registered office and is in an office tower, not an industrial park; (c) no 生产许可 or product certification is held in the seller's own name — certificates show a different company; (d) they are not in any CIOE/China Refrigeration/CDCC exhibitor list; (e) they quote across five unrelated categories. Always cross-check the 统一社会信用代码 on gsxt.gov.cn.
    • The reverse trap: assuming a trader is always bad. For a 20-line mixed BOM, a competent Guangdong trading company is often the only party that will handle consolidation, export documentation and one invoice. The trap is paying manufacturer margins for trader service, or letting the trader hide who actually made the goods so warranty has no counterparty.
    • Cooling capacity quoted at undeclared conditions. A '100 kW' CRAH at 15/21C chilled water is a different machine from a '100 kW' CRAH at 12/18C, and a '35 kW' passive rear door at 12C water is not the same product as one at 18C. Chinese quotes routinely omit the conditions and Western buyers routinely compare the headline number.
    • CDU kW ratings with only one loop temperature. A CDU is defined by primary in, primary out, secondary in, secondary out and both flow rates. A single number is not a specification and cannot be compared across vendors.
    • Residual air heat in liquid-cooled racks. Vendors state '90% heat captured to liquid' and buyers size the room for 10%. In practice the uncaptured fraction is often 15-25% under real workloads, and a 120 kW rack then dumps 25 kW into a hall designed for 12. Ask for kW of residual air heat per chassis, in writing.
    • Filled floor loading for immersion tanks. A filled immersion tank can exceed 2,000 kg/m2. Chinese quotes give the dry weight. The building, not the tank, is what fails.
    • Aluminium substituted for copper in busbar, busway and switchgear. It is legal, it meets the current rating, and it is not what the buyer priced. Specify conductor material and cross-section, and weigh a sample on arrival.
  • DCIM software platform (licence)数据中心基础设施管理平台 / 动环监控软件
    Facility systemsHS 8523.49per licenceCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
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