What quality control steps should a China order include?
Direct Answer
A China order should run three inspection gates: IQC checks incoming materials, IPQC watches the line during production, and OQC/FQC performs a final random check, usually to AQL 2.5 for major defects, before the container is sealed. An independent third-party inspection at the finished-goods stage is the cheapest insurance you can buy. RND SOURCING books AQL 2.5 pre-shipment inspection on every order so a defect problem is caught inside the factory, not in your customer's hands.
Detailed Explanation: The Three Inspection Gates
Quality control is not one inspection at the end — it is a sequence that catches problems while they are still cheap to fix. The three gates map to three moments in production.
- IQC — Incoming material Inspect raw materials and components when they arrive, before they become your product.
- IPQC — In-process Walk the line during production to catch tooling drift, wrong materials, or process errors early.
- OQC / FQC — Final random A statistically random pull of finished goods, usually to AQL 2.5, right before shipment.
Real-World Example: The Loose-Rivet Batch
A US kitchenware brand ordered 4,000 stainless tools. At OQC, RND SOURCING drew the AQL 2.5 sample of 200 units (General Inspection Level II, code L) and found 13 major defects — loose rivets that would fail in use. The lot had an accept/reject threshold of 10/11, so it failed.
The supplier reworked the line, re-tested, and a second inspection found 4 major defects — a pass. The batch shipped clean instead of becoming a 30% returns disaster.
Key Data: The AQL 2.5 Sampling Plan
| Lot size (units) | Sample (Level II) | Major AQL 2.5 accept / reject | Minor AQL 4.0 accept / reject |
|---|---|---|---|
| 501 – 1,200 | 80 | 5 / 6 | 7 / 8 |
| 1,201 – 3,200 | 125 | 7 / 8 | 10 / 11 |
| 3,201 – 10,000 | 200 | 10 / 11 | 14 / 15 |
Based on ANSI/ASQ Z1.4 and ISO 2859-1. Critical (safety) defects are zero-tolerance (AQL 0.0). Sample size is set by lot size, not a fixed percentage.
Step-by-Step: A Practical QC Flow
Build this into the purchase contract before production starts.
Write the AQL into the PO
Specify Critical 0, Major 2.5, Minor 4.0 and the defect classification sheet with photos.
Run IQC
Reject non-conforming materials at the door so they never enter the line.
Run IPQC
Inspect during production; fix tooling or process issues while output is still low.
Book OQC / FQC
An independent inspector draws a random sample near completion and applies the AQL.
Gate the balance payment
Release the final payment only after a passed inspection report. Leverage ends once you pay.
Common Mistakes That Let Defects Ship
These are the shortcuts RND SOURCING warns every buyer against.
- Accepting the factory's default AQL Suppliers propose loose limits. Write your own in the contract.
- Skipping the random pull A factory hand-picking 'perfect' units defeats the whole statistical point.
- Inspecting after payment Once the balance is paid, the supplier has no incentive to rework.
- Using one AQL for everything A phone charger and a decorative candle carry very different risk.
How RND SOURCING Protects You
RND SOURCING treats inspection as a gate, not a favor. We write the AQL into your purchase order, run IQC and IPQC with the factory, and book an independent AQL 2.5 pre-shipment inspection before the container is sealed — then we hold the balance payment against a passed report.
You get a documented inspection result, not a supplier's promise, before your money moves.
Book AQL 2.5 inspection with RND SOURCINGRelated Questions
- How can I verify a Chinese supplier's business license and avoid scams?
- How do I tell if a Chinese supplier is a factory or a trading company?
- Who is responsible for customs clearance and freight under different Incoterms?
- When should I hire a China sourcing agent, and who should pay them?
- What should a China quality inspection report include?
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