Analytical Rheology and Thermal Methods for Polymer Lot Acceptance
High shear capillary rheology and thermal analysis prevent polymer lot failures that low shear melt index testing and supplier certificates miss entirely.
Retain Sample Testing
Meaning
Quality assurance procedures involve storing and later analyzing representative specimens from a specific production batch to verify material consistency or resolve product quality disputes. Manufacturers set aside these samples at the time of manufacture to establish a physical benchmark of the shipped goods. Utilizing retain sample testing allows both buyers and suppliers to isolate the causes of product failure after the main shipment has departed.
This procedure applies to raw polymers and finished consumer goods but does not cover perishable products with short shelf lives.
Storage Protocol
Production facilities must store these specimens in a controlled environment to prevent environmental degradation or contamination. Each sample requires an unambiguous label linking it to the specific production lot and shipment date. Chinese export factories typically keep these materials for at least one year after the delivery of the batch.
This systematic storage ensures that reliable reference materials are available when problems arise in the field.
Defect Investigation
Chemical and physical properties of the retained specimens are measured if the buyer reports a defect. Conducting retain sample testing helps determine whether the issue occurred during manufacturing or during maritime transport. If the retained sample meets all specifications, the failure is likely due to improper storage or processing by the buyer.
This analysis helps locate where in the supply chain the product was compromised.
Legal Defense
Retained specimens provide vital evidence during formal quality disputes in Chinese courtrooms or arbitration centres. Legal teams use these tested specimens to defend against claims of non-conforming goods or product liability.