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

Cooling

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

showing 60
  • 1U/2U aluminium extrusion CPU heatsink铝挤压 CPU 散热器
    CoolingHS 8473.30 / 7616.99contestedper 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
    • Hold-up time simply absent from the quote. CRPS baseline is 12ms at 50% load; a supplier who omits it has usually cut bulk capacitance. Always demand the number plus the load, input voltage, and the scope capture. Two 'identical' 800W CRPS units can differ by 40% in bulk cap cost and only this field exposes it.
    • Efficiency quoted at the flattering load point. 'Up to 96%' is always the 50% load figure at 230V. Titanium 230V EU requires 90/93/95/91% at 10/20/50/100% with PF>=0.95, and Titanium is the only tier that even tests the 10% point - which is where a lightly loaded redundant pair actually sits.
    • 80 PLUS claimed but not certified. Fake 80 PLUS marks on Chinese-market PSUs are documented. The registry at plugloadsolutions.com is free and public - require the exact searchable model name and report number, and treat 'meets Platinum standard' as uncertified.
    • Low-line derating hidden. A '1600W' CRPS may deliver ~1000W at 100-127VAC. Always require the rating at both input windows in writing.
    • Fan curves given as max CFM only. Free-air CFM is meaningless inside a 1U at high impedance. Without the full P-Q curve and max static pressure you cannot tell whether the fan moves any air in the actual chassis.
    • 'Dual rotor' where only one rotor is driven. Counter-rotating fans command a premium for a reason; confirm both rotors are independently driven with their own PWM and tach signals.
    • Fan L10 life quoted at 40C. A 120,000-hour claim at 40C is roughly a quarter of that at 70C. Always require the temperature that goes with the life number.
  • Acoustic attenuator and barrier package for dry cooler / chiller yard干冷器及冷机场地消声器与隔声屏障
    CoolingHS 7308.90 / 8421.99contestedper setCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Missing and frequently a planning-permission blocker at destination. Every dB of attenuation costs air-side pressure drop and therefore cooler capacity — buy the attenuator and the cooler as one sized package or you will be short of capacity.
    • 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.
  • Adiabatic dry cooler with spray or pad pre-cooling绝热喷淋型干冷器
    CoolingHS 8419.50per unitCN 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.
  • AHU / fan wall filter set, G4 pre + F7/ePM1 final, with dP switch空调机组过滤器组 G4+F7/ePM1
    CoolingHS 8421.39per setCN 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.
  • Air-cooled magnetic-bearing centrifugal chiller风冷磁悬浮离心式冷水机组
    CoolingHS 8418.69contestedper unitCN 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.
  • Air-cooled screw chiller with integrated free cooling风冷螺杆式冷水机组（带自然冷却）
    CoolingHS 8418.69per unitCN supply: dominant
    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.
  • Air-cooled screw chiller with integrated free cooling, 100-400 kW风冷螺杆式冷水机组 带自然冷却 100-400kW
    CoolingHS 8418.69per unitCN 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.
  • Air duct / airflow shroud导风罩
    CoolingHS 3926.90per pcCN supply: moderate
    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.
  • Air separator / vacuum degasser for secondary loop液冷排气/真空脱气装置
    CoolingHS 8421.39 / 8479.89contestedper unitCN supply: strong
    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.
  • Annual coolant maintenance and fluid-analysis contract冷却液年度维护与化验服务合同
    Coolingper contract-yearCN supply: moderate
    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.
  • Anti-vibration flexible connector / expansion joint减震软接头/波纹补偿器
    CoolingHS 8307.10 / 4009.42contestedper pcsCN 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.
  • Automatic flow limiter / balancing valve, per rack branch自力式流量平衡阀
    CoolingHS 8481.80per pcsCN 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.
  • Bag/compact filter, ISO ePM1 80% (ex-F9)高中效过滤器 ePM1 80%
    Coolingper 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
    • VERDICT — 3M PFAS exit: CONFIRMED. Press release dated 2022-12-20 commits 3M to discontinue all fluoropolymers, fluorinated fluids and PFAS-based additive products by end-2025; that is the mechanism removing Novec and Fluorinert. The release does not name those brands, so do not quote it as if it does.
    • VERDICT — '3M is now PFAS-free': OVERSTATED. 3M's own FY2025 report says the manufacturing exit completed at end-2025, but ChemSec's analysis of that report counts ~14,000 products still containing PFAS and 139 PFAS types still in use. The exit is of manufacture, not of use.
    • VERDICT — EU universal PFAS restriction is in force: REFUTED. It is a proposal. RAC opinion adopted 2026-03-02; SEAC draft opinion published 2026-03-26 with a 60-day consultation; final SEAC opinion expected end-2026, then Commission legislative decision. Nothing is banned yet.
    • TRAP — PFPE and HFE are themselves PFAS under the ECHA proposal. Selling a Chinese PFPE or HFE as the 'compliant replacement' for Novec into an EU-bound project is a regulatory time bomb, not a solution. Both RAC and SEAC recommended cutting many proposed derogations.
    • VERDICT — 巨化股份 600160 makes electronic fluorinated fluids: CONFIRMED (HFE D-series, PFPE JHT-series). ENTITY TRAP: the 5,000 t/a 巨芯冷却液 PFPE coolant project sits in 浙江创氟高科新材料, controlled by unlisted parent 巨化集团, phase 1 of 1,000 t/a running. Investors have publicly disputed which entity holds the equity and the patents. Confirm the contracting legal entity on the PI, not the ticker.
    • VERDICT — 三美股份 603379 as a coolant/dielectric fluid maker: REFUTED. Its own website lists hydrofluoric acid, refrigerants, blowing agents, etching materials and by-products only. Remove it from the coolant supplier list.
    • VERDICT — 永和股份 605020 as an immersion coolant maker: OVERSTATED. Real line is fluorocarbon chemicals, fluoropolymers (PTFE/FEP/PFA/PVDF) and fluorine fine chemicals including 全氟己酮 (FK-5-1-12) — a fire-suppression agent. Keep it as a fire-agent and fluoropolymer supplier; delete the coolant claim.
  • Bag filter, ISO ePM1 50-65% (ex-F7)中效袋式过滤器 ePM1 50-65%
    CoolingHS 8421.39contestedper 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
    • VERDICT — 3M PFAS exit: CONFIRMED. Press release dated 2022-12-20 commits 3M to discontinue all fluoropolymers, fluorinated fluids and PFAS-based additive products by end-2025; that is the mechanism removing Novec and Fluorinert. The release does not name those brands, so do not quote it as if it does.
    • VERDICT — '3M is now PFAS-free': OVERSTATED. 3M's own FY2025 report says the manufacturing exit completed at end-2025, but ChemSec's analysis of that report counts ~14,000 products still containing PFAS and 139 PFAS types still in use. The exit is of manufacture, not of use.
    • VERDICT — EU universal PFAS restriction is in force: REFUTED. It is a proposal. RAC opinion adopted 2026-03-02; SEAC draft opinion published 2026-03-26 with a 60-day consultation; final SEAC opinion expected end-2026, then Commission legislative decision. Nothing is banned yet.
    • TRAP — PFPE and HFE are themselves PFAS under the ECHA proposal. Selling a Chinese PFPE or HFE as the 'compliant replacement' for Novec into an EU-bound project is a regulatory time bomb, not a solution. Both RAC and SEAC recommended cutting many proposed derogations.
    • VERDICT — 巨化股份 600160 makes electronic fluorinated fluids: CONFIRMED (HFE D-series, PFPE JHT-series). ENTITY TRAP: the 5,000 t/a 巨芯冷却液 PFPE coolant project sits in 浙江创氟高科新材料, controlled by unlisted parent 巨化集团, phase 1 of 1,000 t/a running. Investors have publicly disputed which entity holds the equity and the patents. Confirm the contracting legal entity on the PI, not the ticker.
    • VERDICT — 三美股份 603379 as a coolant/dielectric fluid maker: REFUTED. Its own website lists hydrofluoric acid, refrigerants, blowing agents, etching materials and by-products only. Remove it from the coolant supplier list.
    • VERDICT — 永和股份 605020 as an immersion coolant maker: OVERSTATED. Real line is fluorocarbon chemicals, fluoropolymers (PTFE/FEP/PFA/PVDF) and fluorine fine chemicals including 全氟己酮 (FK-5-1-12) — a fire-suppression agent. Keep it as a fire-agent and fluoropolymer supplier; delete the coolant claim.
  • Bare heat pipe (sintered / grooved wick) as a component热管（烧结/沟槽）散热管
    CoolingHS 8419.50per 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
    • Hold-up time simply absent from the quote. CRPS baseline is 12ms at 50% load; a supplier who omits it has usually cut bulk capacitance. Always demand the number plus the load, input voltage, and the scope capture. Two 'identical' 800W CRPS units can differ by 40% in bulk cap cost and only this field exposes it.
    • Efficiency quoted at the flattering load point. 'Up to 96%' is always the 50% load figure at 230V. Titanium 230V EU requires 90/93/95/91% at 10/20/50/100% with PF>=0.95, and Titanium is the only tier that even tests the 10% point - which is where a lightly loaded redundant pair actually sits.
    • 80 PLUS claimed but not certified. Fake 80 PLUS marks on Chinese-market PSUs are documented. The registry at plugloadsolutions.com is free and public - require the exact searchable model name and report number, and treat 'meets Platinum standard' as uncertified.
    • Low-line derating hidden. A '1600W' CRPS may deliver ~1000W at 100-127VAC. Always require the rating at both input windows in writing.
    • Fan curves given as max CFM only. Free-air CFM is meaningless inside a 1U at high impedance. Without the full P-Q curve and max static pressure you cannot tell whether the fan moves any air in the actual chassis.
    • 'Dual rotor' where only one rotor is driven. Counter-rotating fans command a premium for a reason; confirm both rotors are independently driven with their own PWM and tach signals.
    • Fan L10 life quoted at 40C. A 120,000-hour claim at 40C is roughly a quarter of that at 70C. Always require the temperature that goes with the life number.
  • Biocide dosing package (TCS)二次侧杀菌剂
    Coolingper L / pailCN 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
    • VERDICT — 3M PFAS exit: CONFIRMED. Press release dated 2022-12-20 commits 3M to discontinue all fluoropolymers, fluorinated fluids and PFAS-based additive products by end-2025; that is the mechanism removing Novec and Fluorinert. The release does not name those brands, so do not quote it as if it does.
    • VERDICT — '3M is now PFAS-free': OVERSTATED. 3M's own FY2025 report says the manufacturing exit completed at end-2025, but ChemSec's analysis of that report counts ~14,000 products still containing PFAS and 139 PFAS types still in use. The exit is of manufacture, not of use.
    • VERDICT — EU universal PFAS restriction is in force: REFUTED. It is a proposal. RAC opinion adopted 2026-03-02; SEAC draft opinion published 2026-03-26 with a 60-day consultation; final SEAC opinion expected end-2026, then Commission legislative decision. Nothing is banned yet.
    • TRAP — PFPE and HFE are themselves PFAS under the ECHA proposal. Selling a Chinese PFPE or HFE as the 'compliant replacement' for Novec into an EU-bound project is a regulatory time bomb, not a solution. Both RAC and SEAC recommended cutting many proposed derogations.
    • VERDICT — 巨化股份 600160 makes electronic fluorinated fluids: CONFIRMED (HFE D-series, PFPE JHT-series). ENTITY TRAP: the 5,000 t/a 巨芯冷却液 PFPE coolant project sits in 浙江创氟高科新材料, controlled by unlisted parent 巨化集团, phase 1 of 1,000 t/a running. Investors have publicly disputed which entity holds the equity and the patents. Confirm the contracting legal entity on the PI, not the ticker.
    • VERDICT — 三美股份 603379 as a coolant/dielectric fluid maker: REFUTED. Its own website lists hydrofluoric acid, refrigerants, blowing agents, etching materials and by-products only. Remove it from the coolant supplier list.
    • VERDICT — 永和股份 605020 as an immersion coolant maker: OVERSTATED. Real line is fluorocarbon chemicals, fluoropolymers (PTFE/FEP/PFA/PVDF) and fluorine fine chemicals including 全氟己酮 (FK-5-1-12) — a fire-suppression agent. Keep it as a fire-agent and fluoropolymer supplier; delete the coolant claim.
  • Biocide for closed liquid-cooling loops (isothiazolinone type)闭式循环杀菌剂 异噻唑啉酮类
    CoolingHS 3808.94per LCN supply: dominant
    classify first

    Biocides are separately regulated products at destination — EU BPR and US EPA registration are frequent import blockers even when the chemical is common.

    7 ways buyers get burned here
    • Biocides are separately regulated products at destination — EU BPR and US EPA registration are frequent import blockers even when the chemical is common.
    • 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.
  • Brazed / gasketed plate heat exchanger for CDU钎焊 / 可拆板式换热器
    CoolingHS 8419.50per pcCN supply: dominant
    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.
  • Butterfly valve, DN200-DN600, lugged, with actuator蝶阀 DN200-DN600 带执行器
    CoolingHS 8481.80per pcsCN 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.
  • CDU 3-way modulating control valve with actuatorCDU 三通调节阀及执行器
    CoolingHS 8481.80per pcsCN 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.
  • CDU brazed plate heat exchanger (BPHE)CDU 钎焊板式换热器
    CoolingHS 8419.50per pcsCN supply: strong
    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.
  • CDU circulation pump, canned-motor or close-coupled centrifugal, VFDCDU 循环泵 屏蔽泵/离心泵 变频
    CoolingHS 8413.70per pcsCN supply: strong
    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.
  • CDU controller integration kit for leak detection漏水检测与 CDU 控制器联动接口
    CoolingHS 9032.89per 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.
  • CDU controller with Modbus TCP, BACnet IP, SNMP v3 and RedfishCDU 控制器 支持Modbus/BACnet/SNMP/Redfish
    CoolingHS 9032.89per pcsCN supply: strong
    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.
  • CDU gasketed plate heat exchanger (openable, cleanable)CDU 可拆板式换热器
    CoolingHS 8419.50per pcsCN 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.
  • CDU inline particulate filter cartridgeCDU 管道过滤芯
    CoolingHS 8421.29 / 8421.99contestedper pcCN 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
    • VERDICT — 3M PFAS exit: CONFIRMED. Press release dated 2022-12-20 commits 3M to discontinue all fluoropolymers, fluorinated fluids and PFAS-based additive products by end-2025; that is the mechanism removing Novec and Fluorinert. The release does not name those brands, so do not quote it as if it does.
    • VERDICT — '3M is now PFAS-free': OVERSTATED. 3M's own FY2025 report says the manufacturing exit completed at end-2025, but ChemSec's analysis of that report counts ~14,000 products still containing PFAS and 139 PFAS types still in use. The exit is of manufacture, not of use.
    • VERDICT — EU universal PFAS restriction is in force: REFUTED. It is a proposal. RAC opinion adopted 2026-03-02; SEAC draft opinion published 2026-03-26 with a 60-day consultation; final SEAC opinion expected end-2026, then Commission legislative decision. Nothing is banned yet.
    • TRAP — PFPE and HFE are themselves PFAS under the ECHA proposal. Selling a Chinese PFPE or HFE as the 'compliant replacement' for Novec into an EU-bound project is a regulatory time bomb, not a solution. Both RAC and SEAC recommended cutting many proposed derogations.
    • VERDICT — 巨化股份 600160 makes electronic fluorinated fluids: CONFIRMED (HFE D-series, PFPE JHT-series). ENTITY TRAP: the 5,000 t/a 巨芯冷却液 PFPE coolant project sits in 浙江创氟高科新材料, controlled by unlisted parent 巨化集团, phase 1 of 1,000 t/a running. Investors have publicly disputed which entity holds the equity and the patents. Confirm the contracting legal entity on the PI, not the ticker.
    • VERDICT — 三美股份 603379 as a coolant/dielectric fluid maker: REFUTED. Its own website lists hydrofluoric acid, refrigerants, blowing agents, etching materials and by-products only. Remove it from the coolant supplier list.
    • VERDICT — 永和股份 605020 as an immersion coolant maker: OVERSTATED. Real line is fluorocarbon chemicals, fluoropolymers (PTFE/FEP/PFA/PVDF) and fluorine fine chemicals including 全氟己酮 (FK-5-1-12) — a fire-suppression agent. Keep it as a fire-agent and fluoropolymer supplier; delete the coolant claim.
  • CDU, liquid-to-air sidecar, 40-100 kW液气型CDU / 风液换热柜
    CoolingHS 8419.50per unitCN 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.
  • CDU, liquid-to-liquid, in-row, 200-350 kW冷量分配单元 CDU（液液型，列间式）
    CoolingHS 8419.50per unitCN 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.
  • CDU, liquid-to-liquid, skid, 1-2.5 MW大功率CDU / 液冷分配集装式机组
    CoolingHS 8419.50per skidCN 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.
  • CDU side-stream filter cartridge, 5 um absolute, polypropylene, 10"/20" DOE or code-7CDU旁流过滤滤芯 5um PP
    CoolingHS 8421.99per pieceCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Filter class fraud: media sold as ePM1 55% (F7) that tests at coarse-filter performance. Demand the ISO 16890 report number, the accredited laboratory and the report date, and spot-test media from the delivered lot — not from the sample.
    • Nominal versus actual filter dimensions: a filter quoted as 600x600 that measures 592x592 against a frame expecting 595x595 leaks unfiltered air around the element and voids the rated efficiency entirely. Always specify actual mm and tolerance.
    • Buying filters on unit price instead of Eurovent energy class: a filter 30 Pa higher in initial pressure drop can cost more in fan energy over one service life than the entire unit price difference. Compare kWh/yr at 0.944 m3/s, then price.
    • PTM7950 and high-end TIM counterfeits: this is the single most counterfeited item in the data-centre consumable catalogue. Relabelled generic phase-change film is endemic on Chinese marketplaces. Buy only via authorised distribution with lot traceability, and verify storage conditions in transit.
    • Coolant supplied as industrial glycol cut with tap water rather than certified DI water, with no inhibitor package. Conductivity on arrival is the tell — test every drum against a stated uS/cm limit and reject on the number, not on the label.
    • Automotive or HVAC inhibited coolant sold as data-centre coolant: silicates and borates drop out and foul cold-plate microchannels months later. Require a written silicate-free, borate-free, nitrite-free, amine-free declaration.
    • Fitting a mixed-bed DI polishing cartridge to an inhibited PG25 loop: the resin strips the inhibitor package out of the fluid and corrosion begins silently. Common and expensive design error, usually made by whoever specified the CDU rather than the fluid.
  • CDU spares and consumables kit, 2-yearCDU 两年期备件与耗材包
    Coolingper kitCN supply: strong
    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.
  • Chemical-filtration fresh air unit (ISA 71.04 G1 environment)化学过滤新风机组
    CoolingHS 8421.39contestedper unitCN 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.
  • Chilled-water buffer / thermal storage tank (ride-through)蓄冷罐 / 冷量缓冲水箱
    CoolingHS 7309.00contestedper tankCN 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.
  • Chilled water plant control system (group control)冷站群控系统
    CoolingHS 9032.89per 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.
  • Chilled water pump, end-suction or split-case, with VFD, 100-800 m3/h冷冻水泵 端吸/双吸 变频 100-800m3/h
    CoolingHS 8413.70per unitCN 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.
  • Chilled water pump skid, duty/standby, VFD冷冻水泵组撬块（一用一备，变频）
    CoolingHS 8413.70per skidCN supply: dominant
    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.
  • Chiller-less warm-water skid: glycol dry cooler + plate HX + pumps, W32/W40 duty无冷机温水冷源撬块 干冷器+板换+泵组
    CoolingHS 8419.50per skidCN 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.
  • CHW valve, strainer, expansion vessel and air separator package冷冻水阀门 / 过滤器 / 膨胀罐 / 排气装置
    CoolingHS 8481.80contestedper lotCN supply: dominant
    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.
  • Closed-circuit cooler / evaporative condenser闭式冷却塔
    CoolingHS 8419.89per unitCN supply: dominant
    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.
  • Closed-circuit cooling tower / evaporative fluid cooler闭式冷却塔
    CoolingHS 8419.89per unitCN 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.
  • Cold plate and manifold kit for GPU/CPUCPU/GPU冷板及分液歧管组件
    CoolingHS 8419.50 / 8473.30contestedper kit (per node) / manifold per rackCN supply: strong
    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.
  • Cold-plate coolant, 25% PG/water, OAT inhibited冷板式液冷 25%丙二醇 OAT 长效冷却液
    Coolingper L / 200L drum / IBCCN 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
    • VERDICT — 3M PFAS exit: CONFIRMED. Press release dated 2022-12-20 commits 3M to discontinue all fluoropolymers, fluorinated fluids and PFAS-based additive products by end-2025; that is the mechanism removing Novec and Fluorinert. The release does not name those brands, so do not quote it as if it does.
    • VERDICT — '3M is now PFAS-free': OVERSTATED. 3M's own FY2025 report says the manufacturing exit completed at end-2025, but ChemSec's analysis of that report counts ~14,000 products still containing PFAS and 139 PFAS types still in use. The exit is of manufacture, not of use.
    • VERDICT — EU universal PFAS restriction is in force: REFUTED. It is a proposal. RAC opinion adopted 2026-03-02; SEAC draft opinion published 2026-03-26 with a 60-day consultation; final SEAC opinion expected end-2026, then Commission legislative decision. Nothing is banned yet.
    • TRAP — PFPE and HFE are themselves PFAS under the ECHA proposal. Selling a Chinese PFPE or HFE as the 'compliant replacement' for Novec into an EU-bound project is a regulatory time bomb, not a solution. Both RAC and SEAC recommended cutting many proposed derogations.
    • VERDICT — 巨化股份 600160 makes electronic fluorinated fluids: CONFIRMED (HFE D-series, PFPE JHT-series). ENTITY TRAP: the 5,000 t/a 巨芯冷却液 PFPE coolant project sits in 浙江创氟高科新材料, controlled by unlisted parent 巨化集团, phase 1 of 1,000 t/a running. Investors have publicly disputed which entity holds the equity and the patents. Confirm the contracting legal entity on the PI, not the ticker.
    • VERDICT — 三美股份 603379 as a coolant/dielectric fluid maker: REFUTED. Its own website lists hydrofluoric acid, refrigerants, blowing agents, etching materials and by-products only. Remove it from the coolant supplier list.
    • VERDICT — 永和股份 605020 as an immersion coolant maker: OVERSTATED. Real line is fluorocarbon chemicals, fluoropolymers (PTFE/FEP/PFA/PVDF) and fluorine fine chemicals including 全氟己酮 (FK-5-1-12) — a fire-suppression agent. Keep it as a fire-agent and fluoropolymer supplier; delete the coolant claim.
  • Cold plate, CPU, copper skived-finCPU冷板（铜制铲齿）
    CoolingHS 8473.30per pcCN 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.
  • Cold plate for OAM/SXM accelerator moduleOAM/SXM 加速卡冷板
    CoolingHS 8419.50per plateCN supply: dominant
    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.
  • Cold plate for optical modules / switch ASIC (OSFP, 800G/1.6T liquid-cooled optics)光模块/交换芯片冷板
    CoolingHS 8473.30contestedper pcsCN 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
    • 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.
  • Cold plate gasket / manifold seal set冷板密封垫组件
    CoolingHS 4016.93per setCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Filter class fraud: media sold as ePM1 55% (F7) that tests at coarse-filter performance. Demand the ISO 16890 report number, the accredited laboratory and the report date, and spot-test media from the delivered lot — not from the sample.
    • Nominal versus actual filter dimensions: a filter quoted as 600x600 that measures 592x592 against a frame expecting 595x595 leaks unfiltered air around the element and voids the rated efficiency entirely. Always specify actual mm and tolerance.
    • Buying filters on unit price instead of Eurovent energy class: a filter 30 Pa higher in initial pressure drop can cost more in fan energy over one service life than the entire unit price difference. Compare kWh/yr at 0.944 m3/s, then price.
    • PTM7950 and high-end TIM counterfeits: this is the single most counterfeited item in the data-centre consumable catalogue. Relabelled generic phase-change film is endemic on Chinese marketplaces. Buy only via authorised distribution with lot traceability, and verify storage conditions in transit.
    • Coolant supplied as industrial glycol cut with tap water rather than certified DI water, with no inhibitor package. Conductivity on arrival is the tell — test every drum against a stated uS/cm limit and reject on the number, not on the label.
    • Automotive or HVAC inhibited coolant sold as data-centre coolant: silicates and borates drop out and foul cold-plate microchannels months later. Require a written silicate-free, borate-free, nitrite-free, amine-free declaration.
    • Fitting a mixed-bed DI polishing cartridge to an inhibited PG25 loop: the resin strips the inhibitor package out of the fluid and corrosion begins silently. Common and expensive design error, usually made by whoever specified the CDU rather than the fluid.
  • Cold plate, GPU / OAM moduleGPU冷板 / OAM模组冷板
    CoolingHS 8473.30per pcCN supply: strong
    classify first

    The cold plate itself is unrestricted, but a cold plate designed for a US-controlled accelerator can attract diversion scrutiny. Keep the accelerator model out of the shipping documents unless required.

    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.
  • Cold plate hose assembly with crimped fittings液冷软管总成
    CoolingHS 4009.31 / 8481.80contestedper pcCN 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
    • Hold-up time simply absent from the quote. CRPS baseline is 12ms at 50% load; a supplier who omits it has usually cut bulk capacitance. Always demand the number plus the load, input voltage, and the scope capture. Two 'identical' 800W CRPS units can differ by 40% in bulk cap cost and only this field exposes it.
    • Efficiency quoted at the flattering load point. 'Up to 96%' is always the 50% load figure at 230V. Titanium 230V EU requires 90/93/95/91% at 10/20/50/100% with PF>=0.95, and Titanium is the only tier that even tests the 10% point - which is where a lightly loaded redundant pair actually sits.
    • 80 PLUS claimed but not certified. Fake 80 PLUS marks on Chinese-market PSUs are documented. The registry at plugloadsolutions.com is free and public - require the exact searchable model name and report number, and treat 'meets Platinum standard' as uncertified.
    • Low-line derating hidden. A '1600W' CRPS may deliver ~1000W at 100-127VAC. Always require the rating at both input windows in writing.
    • Fan curves given as max CFM only. Free-air CFM is meaningless inside a 1U at high impedance. Without the full P-Q curve and max static pressure you cannot tell whether the fan moves any air in the actual chassis.
    • 'Dual rotor' where only one rotor is driven. Counter-rotating fans command a premium for a reason; confirm both rotors are independently driven with their own PWM and tach signals.
    • Fan L10 life quoted at 40C. A 120,000-hour claim at 40C is roughly a quarter of that at 70C. Always require the temperature that goes with the life number.
  • Cold plate / liquid cooling loop for CPU/GPU液冷冷板
    CoolingHS 8419.50per setCN supply: moderate
    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.
  • Cold plate / manifold gasket set冷板与分液器密封垫
    Coolingper 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
    • VERDICT — 3M PFAS exit: CONFIRMED. Press release dated 2022-12-20 commits 3M to discontinue all fluoropolymers, fluorinated fluids and PFAS-based additive products by end-2025; that is the mechanism removing Novec and Fluorinert. The release does not name those brands, so do not quote it as if it does.
    • VERDICT — '3M is now PFAS-free': OVERSTATED. 3M's own FY2025 report says the manufacturing exit completed at end-2025, but ChemSec's analysis of that report counts ~14,000 products still containing PFAS and 139 PFAS types still in use. The exit is of manufacture, not of use.
    • VERDICT — EU universal PFAS restriction is in force: REFUTED. It is a proposal. RAC opinion adopted 2026-03-02; SEAC draft opinion published 2026-03-26 with a 60-day consultation; final SEAC opinion expected end-2026, then Commission legislative decision. Nothing is banned yet.
    • TRAP — PFPE and HFE are themselves PFAS under the ECHA proposal. Selling a Chinese PFPE or HFE as the 'compliant replacement' for Novec into an EU-bound project is a regulatory time bomb, not a solution. Both RAC and SEAC recommended cutting many proposed derogations.
    • VERDICT — 巨化股份 600160 makes electronic fluorinated fluids: CONFIRMED (HFE D-series, PFPE JHT-series). ENTITY TRAP: the 5,000 t/a 巨芯冷却液 PFPE coolant project sits in 浙江创氟高科新材料, controlled by unlisted parent 巨化集团, phase 1 of 1,000 t/a running. Investors have publicly disputed which entity holds the equity and the patents. Confirm the contracting legal entity on the PI, not the ticker.
    • VERDICT — 三美股份 603379 as a coolant/dielectric fluid maker: REFUTED. Its own website lists hydrofluoric acid, refrigerants, blowing agents, etching materials and by-products only. Remove it from the coolant supplier list.
    • VERDICT — 永和股份 605020 as an immersion coolant maker: OVERSTATED. Real line is fluorocarbon chemicals, fluoropolymers (PTFE/FEP/PFA/PVDF) and fluorine fine chemicals including 全氟己酮 (FK-5-1-12) — a fire-suppression agent. Keep it as a fire-agent and fluoropolymer supplier; delete the coolant claim.
  • Cold plate, memory / VR / NVMe secondary loop内存冷板 / 供电模块冷板
    CoolingHS 8473.30per pcCN 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.
  • Condenser water chemical dosing and side-stream filtration skid循环冷却水加药及旁流过滤装置
    CoolingHS 8421.21per skidCN supply: dominant
    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.
  • Condenser water treatment skid — dosing, softener, side-stream filtration循环冷却水处理装置（加药 / 软化 / 旁流过滤）
    CoolingHS 8421.21contestedper skidCN supply: dominant
    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.
  • Containerised CDU skid (liquid-to-liquid)集装箱式CDU冷量分配单元撬块
    CoolingHS 8419.50contestedper skidCN supply: strong
    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.
  • Containerised chiller plant skid (integrated cold station)集装箱式/预制化集成冷站
    CoolingHS 8418.69 / 9406.90contestedper skidCN 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.
  • Containerised dry cooler / free-cooling module集装箱式干冷器/自然冷却模块
    CoolingHS 8419.50per skidCN 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.
  • Containerised water treatment and storage module集装箱式水处理及储水模块
    CoolingHS 8421.21contestedper skidCN 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.
  • Coolant analysis kit / annual laboratory fluid analysis service冷却液检测套件/年度化验服务
    CoolingHS 3822.90per kit or sampleCN supply: strong
    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.
  • Coolant charge: PG25 / deionised water with inhibitor package冷却液 PG25 / 去离子水 及缓蚀剂
    CoolingHS 3820.00 / 3402.50contestedper LCN 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
    • Hold-up time simply absent from the quote. CRPS baseline is 12ms at 50% load; a supplier who omits it has usually cut bulk capacitance. Always demand the number plus the load, input voltage, and the scope capture. Two 'identical' 800W CRPS units can differ by 40% in bulk cap cost and only this field exposes it.
    • Efficiency quoted at the flattering load point. 'Up to 96%' is always the 50% load figure at 230V. Titanium 230V EU requires 90/93/95/91% at 10/20/50/100% with PF>=0.95, and Titanium is the only tier that even tests the 10% point - which is where a lightly loaded redundant pair actually sits.
    • 80 PLUS claimed but not certified. Fake 80 PLUS marks on Chinese-market PSUs are documented. The registry at plugloadsolutions.com is free and public - require the exact searchable model name and report number, and treat 'meets Platinum standard' as uncertified.
    • Low-line derating hidden. A '1600W' CRPS may deliver ~1000W at 100-127VAC. Always require the rating at both input windows in writing.
    • Fan curves given as max CFM only. Free-air CFM is meaningless inside a 1U at high impedance. Without the full P-Q curve and max static pressure you cannot tell whether the fan moves any air in the actual chassis.
    • 'Dual rotor' where only one rotor is driven. Counter-rotating fans command a premium for a reason; confirm both rotors are independently driven with their own PWM and tach signals.
    • Fan L10 life quoted at 40C. A 120,000-hour claim at 40C is roughly a quarter of that at 70C. Always require the temperature that goes with the life number.
  • Coolant chemistry test kit (conductivity, pH, inhibitor, biological)冷却液水质检测套件
    CoolingHS 3822.00contestedper kitCN 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.
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