Quality control inspections in China fall into three main categories: During Production Inspection (DUPRO), Final Random Inspection (FRI), and Pre-Shipment Inspection (PSI). Using the right inspection at the right time typically reduces defect rates by 60-80% compared to no inspection, and catches problems when they’re still fixable — not when the container is already at sea. DUPRO. Conducted when 20-60% of the order is produced. The inspector checks: raw materials, initial production quality, production processes, and whether the manufacturer is following the approved sample and specifications.
Why It Matters
DUPRO’s value is in early detection — if the supplier is using the wrong materials or misinterpreting specifications, catching it at 20% completion means only 20% needs rework. DUPRO is most valuable for first orders with new suppliers, complex products, or orders where quality requirements are tight. Cost: US$250-350 per inspection day in China. FRI. Conducted when 80-100% of the order is produced and packed.
What You Need to Know
The inspector randomly selects samples based on AQL (Acceptable Quality Level) sampling standards — typically AQL 2.5 for major defects and AQL 4.0 for minor defects, following ISO 2859-1 sampling tables. For an order of 5,000 units, the inspector checks 200 units. FRI is the most common inspection type and the minimum acceptable QC for any order. Cost: US$250-350 per inspection day. PSI.
One Data Point
Similar to FRI but conducted after the full order is packed and ready to ship. Some countries require PSI for customs clearance — particularly in Africa and the Middle East. In China, PSI is mandated by certain importing countries but not by China itself. The practical difference from FRI: PSI verifies quantity and packaging integrity in addition to quality. When to use which: first order → DUPRO + FRI.
Repeat orders with a trusted supplier → FRI only. Complex or high-value products → DUPRO at 20% + DUPRO at 60% + FRI at 100%. Food and medical products → add microbiological testing to the inspection scope.
According to QIMA 2025 Quality Report, third-party QC inspections in China detected an average defect rate of 2.8% across all product categories, with electronics at 2.1%, textiles at 3.4%, and toys at 4.2%. Inspections using AQL 2.5 sampling standards catch approximately 95% of batches with defect rates above the acceptable threshold.
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