Quality control in China: how a pre-shipment inspection works

You can pick the supplier perfectly and negotiate a good price — and still receive defects if you skip quality control. A pre-shipment inspection turns “I hope it’s fine” into “verified, shipping.” Let us break down how it works.

Why should goods from China be inspected before shipment?

The main rule: quality is checked in China, before the cargo leaves. If defects surface at your warehouse, fixing them is late and expensive: the goods have to be returned halfway around the world, or you accept the loss.

When the inspection happens at the factory before shipment, you have leverage: the final payment and shipment are tied to the result. The factory is motivated to fix the findings.

Types of quality control

For most orders PSI is enough; for complex and large ones, add DUPRO.

What exactly is checked

• Quantity and completeness — against the spec.
• Appearance and defects — chips, scratches, coating/upholstery flaws.
• Dimensions and materials — against the brief, with measurements.
• Colour and tone — by sample or code.
• Functionality — mechanisms, hardware, connected units.
• Packaging and labelling — will it survive transit.

The acceptance standard: AQL

A professional inspection relies on AQL (Acceptable Quality Limit) under ISO 2859 — an acceptable defect level agreed in advance. Defects fall into three classes:

• Critical — not allowed (AQL 0): a hazard or total unfitness.
• Major — a common threshold of AQL 2.5.
• Minor — a common threshold of AQL 4.0.

The levels are fixed in the contract before the check — this removes the “defect or not” dispute.

How to read a photo report

A good report is not three “all good” pictures but a structured document: general batch photos, per-item photos of key items, macro shots of problem areas, measurements with a tool, and a conclusion (pass / fail with a list of findings). If the report has only general views, request a more thorough check.

Mini-case: 12% defects caught before shipment

A batch of 600 restaurant chairs. A PSI at AQL 2.5 found that ~12% of items had a sagging rocking mechanism and a tone mismatch in upholstery from two rolls. Because the final payment was tied to the inspection, the factory replaced the mechanisms and re-sewed the upholstery at its own cost before shipment. Without the inspection, the defects would have surfaced on site — with a return halfway around the world and a missed opening.

What to do if defects are found

• Minor defects — fixed by the factory before shipment.
• A systemic problem — rework at the manufacturer’s cost.
• Critical defects — no shipment until corrected; the final payment is held.

This is exactly why the inspection + staged payment pairing matters — it gives leverage, not promises. The acceptance reference is an approved golden sample.

How much does a China product inspection cost and who performs it?

Inspections are run by independent inspection agencies (third-party) or the sourcing agent’s inspector. The cost is usually counted in man-days: one inspector checks a limited volume per day against an AQL sample, the size of which comes from the ISO 2859 tables and depends on the batch size.

• Independent control versus the factory’s self-check. The factory is interested in shipping, so an outside inspector is more objective.
• Sample size grows with the batch, but not linearly — a representative sample is checked, not every single unit.
• The cost of inspection is incomparable to the loss from a defective batch on site.

For large and critical orders, in-process control (DUPRO) and loading supervision are added — so that exactly what was checked, in the right quantity, goes into the container.

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Want to be sure of quality before shipment? We run inspections at the production site to AQL with a photo report per item — you see exactly what is leaving for you, before it ships from China. A free consultation.