A proper quality control plan is essential when manufacturing in China. QC packages are typically divided into stages, each serving a different purpose in catching defects before they reach your customers.
| Type | Timing | Typical Cost | Best For |
|---|---|---|---|
| Pre-Production (PPI) | Before mass production | ¥1,000-3,000 | Verify raw materials, first article |
| During Production (DUPRO) | When 10-30% complete | ¥2,000-5,000 | Catch issues early |
| Pre-Shipment (PSI) | When 80-100% complete | ¥2,000-5,000 | Final quality gate |
| Container Loading (CLS) | During loading | ¥1,500-3,000 | Verify quantity & loading conditions |
Most manufacturing uses AQL per ISO 2859/ANSI ASQ Z1.4. Common levels: Critical 0%, Major 1.0%, Minor 2.5% (general products); Major 0.65%, Minor 1.5% (automotive); Major 0.4%, Minor 1.0% (medical). Sample size is determined by lot size and inspection level (G-I, G-II, G-III).
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