Statistical Process Control Transition Rules for Skip Lot Qualification
Transitioning to skip-lot sampling demands a proven Cpk of 1.33 across consecutive lots and contract rules that force instant reversion to full inspection upon any defect.
Lot-by-Lot Inspection
Meaning
Verification protocols at the General Administration of Customs of China mandate the sampling of distinct production batches to confirm adherence to declared quality and safety parameters. These checks define lot-by-lot inspection as a mandatory sequence of physical examination and lab analysis performed on individual goods consignments prior to border release. Customs officials utilize this process to determine whether the submitted documentation matches the actual composition of the import or export.
This framework applies to all regulated commodities moving through legal entry points, regardless of previous compliance history.
Regulatory Compliance
Authorities govern this duty through the Law of the People’s Republic of China on Import and Export Commodity Inspection. Administrative officers draw samples from containers according to predetermined statistical plans to ensure the representation of the entire shipment volume. Compliance entails that the goods correspond exactly to the technical specifications cited in the filing.
Discrepancies between the results and the declaration lead to immediate detention or seizure of the shipment.
Operational Enforcement
Implementation focuses on the systematic separation of trade batches to prevent the commingling of nonconforming items with approved cargo. Customs agents perform the physical work at dedicated supervision zones where they assess labels, chemical properties, and physical dimensions. The procedure necessitates a declaration of the batch number, manufacturer details, and date of production for every distinct unit.
Companies bear the responsibility for providing clear access to these units while preventing any alteration of the goods during the assessment phase.
Financial Liability
Exporters face substantial economic risk when a failure occurs during this mandatory review of specific batches. Direct costs include warehouse storage fees, laboratory testing charges, and administrative penalties for misrepresentation. Parties involved in the supply chain carry the burden of these losses because no insurance policy covers the rejection of goods based on quality violations detected by the state.
Accurate documentation of every production batch reduces the likelihood of these outcomes.