Meaning
Systematic audit procedures for incoming synthetic resins verify chemical composition and melt characteristics before factory release. Conducting raw polymer qualification protects Chinese manufacturing facilities from processing downtime and product failures caused by off-spec raw materials. Governed by enterprise quality management systems and Chinese national material standards, the evaluation process determines vendor approval status.
The qualification governs raw material acceptance for production, ending once resin enters factory compounding or molding equipment.
Audit Procedure
Quality control personnel inspect incoming resin shipments against vendor certificates of analysis and technical purchase specifications. Laboratory technicians measure melt flow index, density, moisture content, and molecular weight distribution for each incoming lot. Trial processing runs evaluate resin behavior inside production molds to confirm shrinkage parameters and surface finish quality.
Unapproved material lots remain in quarantined storage pending formal disposition by quality engineering departments. Supplier approval requires successful completion of three consecutive production batch trials.
Regulatory Supervision
Chinese market regulation authorities require documented material traceability for consumer plastic goods. Quality assurance records must link final product batch codes directly to verified raw material lots. Enterprise compliance audits verify testing documentation during annual regulatory reviews.
Scope Boundary
Material qualification testing does not guarantee final part performance when molding machines operate outside target process windows. Processing parameter control remains necessary to achieve target mechanical properties.
