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Quality Assurance5 min read•2026-08-30
How to Verify a Polymer Certificate of Analysis (CoA) & Prevent Contamination
QA & Laboratory Audit Desk
Birka Lead Quality Inspector
A manufacturer Certificate of Analysis (CoA) is the legal proof of raw material integrity. Learn the 5 critical verification checkpoints every factory manager in Iraq must audit before signing delivery receipts.
1. The 5 Mandatory Verification Checkpoints
1. Batch & Lot Number Synchronization: Cross-reference the printed lot code on the 25kg bags with the official CoA document header.
2. Melt Flow Rate (MFR) Variance: Ensure the reported MFI is within the manufacturer stated ±10% tolerance window (ASTM D1238).
3. Density Verification: Confirm specific gravity matches technical data sheet nominals (ASTM D792) to detect unapproved filler blending.
4. Moisture Content: Verify volatile matter is below 0.05% (for polyolefins) or 0.25% (for PVC) to prevent surface splay and bubble voids during extrusion.
5. Stamp & Laboratory Accreditation: Check for certified laboratory stamps, ISO 9001 registration, and producer signature.
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