Introduction
Quality control is the difference between a successful import business and a costly disaster. Without proper QC measures, you risk receiving defective products, damaging your brand reputation, and losing customers.
Quality inspection
This guide covers everything you need to know about ensuring product quality when sourcing from China.
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The 4 Stages of Quality Control
Quality control isn't a single event — it's a process that spans the entire production cycle.
Stage 1: Pre-Production Inspection (PPI)
Raw materials inspection
What to Check:
When: Before production starts
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Stage 2: During Production Inspection (DUPRO)
Production line inspection
What to Check:
When: When 20-30% of production is complete
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Stage 3: Pre-Shipment Inspection (PSI)
Final inspection
What to Check:
When: When 80-100% of production is complete
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Stage 4: Container Loading Supervision (CLS)
Container loading
What to Check:
When: During container loading
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AQL Sampling Standards
AQL (Acceptable Quality Level) is the industry standard for inspection sampling:
Inspection LevelSample SizeAcceptReject
Level I (Reduced)32 units1 defect2 defects Level II (Normal)80 units3 defects4 defects Level III (Tightened)125 units5 defects6 defects
> Recommendation: Use Level II (Normal) for most inspections. Use Level III for critical products or new suppliers.
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Common Quality Issues
Product defects
Types of Defects:
CategoryExamplesSeverity
CriticalSafety hazards, non-functionalReject shipment MajorVisible defects, wrong specsNegotiate/reject MinorSmall cosmetic issuesUsually acceptable
Most Common Issues:
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DIY vs Professional Inspection
FactorDIY InspectionProfessional Service
CostFree (your time)$200-400/inspection ExpertiseLimitedHigh TimeYour timeOutsourced ReliabilityVariableConsistent DocumentationBasicDetailed reports
When to Use Professional Inspection:
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Key Takeaways
✅ Implement quality control at every stage
✅ Use AQL sampling standards
✅ Consider professional inspection services for important orders
✅ Document everything with photos and reports
✅ Build quality requirements into your contracts
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Sarah Chen
Senior Sourcing Expert
10+ years experience in China sourcing and supply chain management. Former procurement director helping businesses navigate international trade.