---
source: https://asaptic.com/guide/direct-to-chip-c11000-cold-plate-helium-leak-ashrae-w4-qa
title: C11000 Skived Microchannel Liquid Cold Plates & UQD Manifolds: Helium Leak ≤1×10⁻⁹ Pa·m³/s & ASHRAE W4 Wetted-Loop QA Protocol | Asaptic
description: Serialized quality assurance and factory audit specification for AI server direct-to-chip copper cold plates (800W–1500W TDP): vacuum brazing vs. friction-stir welding, helium mass-spectrometer leak testing, flatness ≤0.02 mm, and PG25 galvanic control.
---

# C11000 Skived Microchannel Liquid Cold Plates & UQD Manifolds: Helium Leak ≤1×10⁻⁹ Pa·m³/s & ASHRAE W4 Wetted-Loop QA Protocol | Asaptic
[Asaptic](https://asaptic.com/) · [Compliance Playbooks](https://asaptic.com/guide/) · [EU Battery Passport Registry](https://asaptic.com/battery-passport/) · [Markdown (.md)](/guide/direct-to-chip-c11000-cold-plate-helium-leak-ashrae-w4-qa.md)

  ASHRAE W4 Wetted-Material Compatibility · Serialized Helium QA

# C11000 Skived Microchannel Liquid Cold Plates & UQD Manifolds: Helium Leak ≤1×10⁻⁹ Pa·m³/s & ASHRAE W4 Wetted-Loop QA Protocol

  Serialized quality assurance and factory audit specification for AI server direct-to-chip copper cold plates (800W–1500W TDP): vacuum brazing vs. friction-stir welding, helium mass-spectrometer leak testing, flatness ≤0.02 mm, and PG25 galvanic control.

## Engineering & Split-Compliance Architecture

      - 100% serialized helium mass-spectrometer leak verification (≤1×10⁻⁹ Pa·m³/s at 1.0 MPa nitrogen/helium proof pressure) logged by laser serial number.

      - Thermal contact baseplate CMM flatness ≤0.02 mm and surface roughness Ra ≤0.8 µm across 1000W+ GPU/ASIC dies.

      - ASHRAE W4 wetted-loop metallurgy: oxygen-free C11000/C10200 copper, 316L stainless manifolds, EPDM peroxides-cured seals (zero brass/zinc dezincification or silicone leachates).

      - Particle cleanliness flush per ISO 4406 prior to nitrogen-purged vacuum pouch sealing.

## Commercial & Importer-of-Record Safeguards

      Asaptic decomposes statutory compliance from commodity factory hardware: audited ISO 9001 / IATF 16949 / ISO 13485 manufacturers supply pre-certified cells, interconnects, or power modules with raw test logs at clean FOB pricing, while Asaptic compiles the EU Technical File, validates protocol telemetry, and hosts serialized compliance endpoints. All EU shipments execute strictly on **FOB Hong Kong/Shenzhen**, **FCA**, or **DAP (Buyer Designated EU Importer-of-Record)** terms.

      **Engineering RFQ & Spec Review (4-hour SLA):** [engage@asaptic.com](mailto:engage@asaptic.com) ·
      [Open Live EU Digital Battery Passport Registry →](https://asaptic.com/battery-passport/)

## Frequently Asked Engineering Questions

    **Why is friction-stir welding (FSW) preferred over flux brazing on high-TDP cold plates?**FSW eliminates residual brazing flux inside 0.15 mm skived microchannels, preventing glycol acidification and micro-clogging in CDU loops.

    **What documentation accompanies each serialized cold plate lot?**Individual helium leak rate log, hydro-proof pressure curve, CMM flatness map, and ΔP vs. LPM flow-resistance curve.