Meaning
Quality control procedures involve the systematic checking of a supplier’s certificate of analysis against independent laboratory results or internal benchmarks. This coa verification ensures that the resin delivered to the plant matches the specifications promised in the purchase order. It acts as a gatekeeper against the accidental introduction of off-grade material or contaminated regrind into the production stream.
Laboratory Validation
Testing a sample from each incoming lot confirms that the reported values for density and melt flow are accurate. While the supplier provides a summary of their own tests, internal coa verification catches discrepancies that might arise from sampling errors or transit issues. Discrepancies often indicate a lack of process control at the resin plant.
Supply Integrity
Maintaining a history of these checks allows a procurement team to rank suppliers based on the reliability of their documentation. When a supplier consistently passes coa verification, the frequency of intensive testing might be reduced to save time. This trust is built over many successful shipments and verified through periodic audits.
Risk Mitigation
Failure to verify the certificate of analysis can lead to catastrophic tool damage if the resin contains the wrong filler or excessive moisture. Costs associated with machine downtime and tool repair far exceed the expense of a quick laboratory check. Accurate verification is a requirement for maintaining high-yield moulding operations.
