Pre-Shipment Inspection in China

What a pre-shipment inspection actually tells you

A pre-shipment inspection, often shortened to PSI or called a final random inspection, is a check of substantially completed goods before they leave the factory. SGS describes its final random inspection as taking place when all goods are produced and at least 80 percent are packed and ready for dispatch. At that point, an inspector can draw samples from finished stock, compare them with the buyer's requirements, and examine the packaging in close to its shipping condition.

Review the SGS description of final random inspection.

The inspection should answer a limited but commercially important question: does the available lot appear to meet the defined requirements well enough for the buyer to accept, hold, or reject it under the agreed plan?

Typical checks include:

• available quantity and packing completion;
• product identity, model, color, size, and assortment;
• visible workmanship and assembly defects;
• basic dimensions, weight, and accessible functional checks;
• retail packaging, carton construction, labels, barcodes, and shipping marks;
• comparison with the purchase order, specification sheet, and approved sample;
• photographic evidence of the goods, factory location, sampling, tests, and defects.

The words "quality inspection" can sound broader than the work really is. A one-day inspection cannot recreate months of product development, verify every component inside every unit, or substitute for a laboratory program. Its value comes from a disciplined sample, a clear checklist, and a decision made while the goods can still be corrected at origin.

Do not book the inspection before defining the order

A common buyer request is simply: "Please inspect the goods and confirm the quality is good." That sentence leaves nearly every important decision to the inspection company. Good compared with what? Which scratches are acceptable? How many units should be switched on? Is the barcode content part of the inspection? Does the inspector have permission to open sealed cartons or perform a destructive test?

Prepare an inspection pack before confirming the visit. It should be controlled by the buyer, not assembled at the last minute by the supplier being inspected.

Identify the exact lot

Provide the purchase order number, supplier legal name, factory address, product model, SKU, color and size breakdown, ordered quantity, and required shipping date. State whether several models are combined in one lot and whether each model needs its own sampling or functional checks. If the factory has split production across buildings or subcontractors, identify where every part of the lot is stored.

Attach the approved product record

The inspector needs more than a catalog picture. Send the approved sample photographs, dated specification sheet, bill of materials details that can be checked without disassembly, dimensions and tolerances, color reference, artwork, and approved packaging files. If the sample changed after approval, issue a revision that shows exactly what changed.

The article on ordering product samples from China explains how to turn a sample into a controlled approval record rather than a loose reference kept on someone's desk.

Write product-specific tests

"Function test" is too vague. For a rice cooker, the checklist might specify lid operation, control response, heating indication, cord and plug type, accessory count, and a short powered cycle under safe factory conditions. It would not prove long-term thermostat reliability, food-contact compliance, electrical safety, or performance after hundreds of cycles. Those require separate methods and, where applicable, qualified laboratories.

For each test, define the sample quantity, equipment, method, expected result, tolerance, and response to a failure. An inspector should not have to invent a test while standing on the production floor.

Define packaging as carefully as the product

Many expensive inspection failures are not manufacturing defects. They are wrong retail artwork, unreadable barcodes, mixed accessories, weak inner protection, incorrect carton quantities, missing country-of-origin marking, or shipping marks that do not match the booking documents. Include approved artwork and a packing diagram, and say which information must be scanned or measured rather than checked visually.

AQL is a sampling system, not a quality promise

AQL stands for Acceptance Quality Limit. It is used to select a sampling plan and set acceptance or rejection thresholds for defined nonconformities. ISO published the third edition of ISO 2859-1 in January 2026. The current edition replaces the 1999 edition and includes single, double, and multiple sampling schemes, switching rules, and updated guidance for applying AQL-indexed sampling.

See the official ISO 2859-1:2026 record. The related ANSI/ASQ Z1.4 standard also describes normal, tightened, and reduced plans for inspection by attributes. See ASQ's overview of Z1.4 and Z1.9.

The tables in the applicable standard connect several inputs:

• Lot size: the number of units presented as one inspection lot.
• Inspection level: the level agreed for the inspection, which affects the sample size.
• Sample size code and plan: the table result used to determine how many units to inspect.
• AQL for each defect class: the index used to obtain acceptance and rejection numbers.
• Observed nonconformities: the classified findings counted in the sample.

There are two mistakes to avoid. First, an AQL of 2.5 is not a promise that exactly 2.5 percent of the shipment is defective. Acceptance sampling involves probabilities, defined plans, and risks for both producer and customer. Second, a passed sample does not prove the uninspected units are perfect. It supports a lot-acceptance decision under that plan.

Do not copy an AQL setting from an unrelated product because it appears in a blog post or a supplier's standard form. The commercial effect of one loose thread on a promotional tote bag is not the same as an unstable leg on a child's chair or exposed wiring on an appliance. Product risk, customer expectations, manufacturing history, and the consequence of a defect should drive the plan.

Critical, major, and minor are buyer decisions

Inspection companies commonly group findings into critical, major, and minor defects. Those labels are useful only when the buyer and inspector agree on their meaning before the visit. A generic defect library is a starting point, not a complete product specification.

Context can move a finding from one class to another. A faint color variation may be minor on an internal component but major on a matched retail set. A spelling error may be cosmetic on an outer shipping carton but a compliance problem in a mandatory warning. Put representative photographs and edge cases in the inspection brief so the classification does not depend on a hurried message exchange during the visit.

How to read the report without stopping at PASS

Read the report in the order the inspection happened, not in the order designed for a quick executive summary.

1. Confirm the factory and inspection date

Check the factory name, address, contact, inspection date, purchase order, and product references. Photographs should make the inspected location and goods identifiable. If the report names a trading company while the visit occurred at an unknown subcontractor, record the relationship before relying on the result.

2. Check production and packing readiness

Compare ordered quantity, presented quantity, completed quantity, and packed quantity. A factory may present only the easiest cartons while unfinished or quarantined goods remain elsewhere. If the lot was not ready, the result may not represent what will eventually ship.

3. Follow the sampling trail

The report should state the lot size, sampling standard and edition, inspection level, sample size, selected carton count, AQL values, and acceptance and rejection numbers. Look for photographs of carton selection and opened samples. Samples should be drawn across the available lot rather than handed to the inspector as a prepared display.

4. Read every defect entry and photograph

Counts alone hide patterns. Six scratches spread randomly across a large sample may call for one response; six scratches in products from the same carton may suggest handling damage or a concentrated process issue. Check whether the photograph supports the written classification, whether several defects occurred on one unit, and whether the location of the defect matters to the customer.

5. Separate workmanship sampling from special tests

AQL counts often apply to the workmanship sample. Dimensions, function, barcode scanning, carton drop checks, assembly trials, or powered tests may use different and much smaller sample quantities. A passed workmanship result cannot cancel a failed safety-related or contractual test. Read the result of each test and its sample size independently.

6. Compare data, not just photographs

Dimensions, weight, electrical rating, assortment, carton quantity, barcode result, and shipping marks should be compared with an approved value. "Looks OK" is not a measurement. When the specification allows a tolerance, the report should show the measured values and the tolerance used.

7. Find what the inspector could not check

Reports often contain remarks such as no approved sample available, factory did not permit a test, equipment was unavailable, cartons were not packed, or the requested document was not provided. These are not footnotes to ignore. They define the limits of the conclusion.

Worked example: the report passes, the shipment stays on hold

A buyer orders 2,400 private-label rice cookers for the UK. The purchase order specifies a UK plug, 220-240 V rating, English retail packaging, one measuring cup, one spoon, and a scannable barcode linked to the correct SKU. Production is complete and 90 percent of the units are packed when an independent inspector visits.

The workmanship sample is within the agreed acceptance numbers. A few light surface marks are recorded as minor. Assembly, accessory count, and the short function check also meet the written criteria. The summary page shows PASS.

One report photograph, however, shows a two-pin EU plug beside the product. The plug check was absent from the inspection protocol, so the inspector treated the photograph as a general observation rather than a counted defect. The factory later explains that the first production cartons contain UK plugs but some remaining cartons were packed with EU cords because the correct cord stock arrived late.

The buyer does not release the shipment. The AQL result was calculated correctly for the checks that were defined, but the inspection brief was incomplete and the lot may contain a mixed, market-specific component. The buyer requests:

1. segregation of every carton by cord and plug type;
2. a factory count showing the affected quantity and carton numbers;
3. 100 percent replacement and verification of the cord set for the UK order;
4. updated packing records and photographs;
5. a focused reinspection that samples across the reworked lot and scans the retail barcode.

This is why the decision belongs to the buyer. The report records evidence against a protocol. It does not understand an omitted requirement, commercial promise, or destination-market consequence unless those items are made part of the inspection.

What a PSI does not prove

A careful pre-shipment inspection reduces uncertainty, but it has firm boundaries.

Regulated products may require testing and certification that cannot be replaced by an on-site visual inspection. The US Consumer Product Safety Commission states that manufacturers or importers must test many consumer products and issue the applicable certificate based on passing results. Children's products generally require testing by a CPSC-accepted third-party laboratory. Review the CPSC testing and certification guidance.

EU importers also have responsibilities to check that products meet applicable safety, health, and environmental requirements and that required documentation is available. Review the European Commission's importer guidance. For CE-marked goods, continue with the guide to checking a Chinese supplier's CE documents.

Inspection is not the same as an audit or company check

These controls overlap at the edges but they are not substitutes. A factory can pass an audit and later produce a defective lot. A lot can pass inspection while the buyer has contracted with the wrong legal entity. Read Factory Audit vs Company Verification for the identity and site distinction.

What to do after a failed or unclear inspection

Do not negotiate from the summary page alone. Turn the report into a controlled corrective-action record.

1. Hold the relevant release decision. Follow the payment and shipment conditions in your contract while the result is unresolved. An inspection company should report evidence; it should not make your commercial or legal decision.
2. Confirm the scope. Ask whether the failure is isolated, concentrated in certain cartons, associated with one production line, or potentially present across the lot.
3. Require containment. The supplier should identify affected goods, separate them from acceptable stock, and prevent packing or loading while review continues.
4. Agree on correction. Rework instructions need a defined method and acceptance record. "We checked everything" is not a corrective-action plan.
5. Inspect the correction. A reinspection should use an appropriate plan across the corrected lot. Do not ask the inspector simply to revisit the photographed units.
6. Preserve the original report. Keep the failure, supplier response, rework evidence, reinspection, and any approved deviation as separate dated records.

A commercial waiver may occasionally be reasonable for a known minor issue, but write down the affected quantity, customer impact, concession, and reason. Quietly changing the defect classification after a failure destroys the value of the inspection history.

Use results across orders, not one report at a time

The 2026 edition of ISO 2859-1 includes switching concepts for normal, tightened, reduced, and skip-lot inspection. These ideas reflect supplier performance over a continuing series of lots. They should not be treated as a shortcut after one good shipment.

Keep a simple supplier quality log:

• order, product, factory, inspection date, and lot size;
• sample plan and defect criteria used;
• critical, major, and minor findings by defect type;
• special-test failures and packaging issues;
• rework, reinspection, late shipment, return, and customer complaint outcomes;
• changes to materials, components, process, factory, or subcontractor.

Patterns matter more than a dashboard full of green PASS labels. Repeated barcode errors may show weak artwork control. A rise in loose fasteners may point to a process change. Clean inspection reports followed by customer failures may mean the on-site tests do not represent real use. Tighten the control where the evidence points, rather than increasing every sample indiscriminately.

An inspection request you can send

Please arrange an independent pre-shipment inspection for purchase order [number] at [factory legal name and address]. Inspect the presented lot against revision [number] of our product specification, approved sample record, packaging artwork, and attached defect list. Please report production and packing completion, sampling standard and edition, inspection level, sample size, AQL and acceptance/rejection numbers, selected carton count, defect photographs, measured values, function-test results, barcode scans, packaging checks, and every item that could not be verified. Do not allow the factory to preselect the samples. Contact us before closing the inspection if a safety issue, wrong product identity, missing test condition, or unlisted market-specific difference is found.

Send the pack to the inspection company and supplier together, then require written acknowledgement before the visit. The goal is not to surprise the factory. It is to remove ambiguity while correction is still possible.

Before the inspector visits

A strong pre-shipment inspection is not created by asking for more pages in the report. It comes from a controlled specification, representative sampling, product-specific defect rules, observable tests, and a buyer who reads the evidence behind the result.

Also confirm who owns the factory, invoice, and order documents. Use the guide to checking a Chinese business license before payment, search the Chinese company, or view a sample company report. Company verification establishes who stands behind the transaction; inspection establishes what was observed in the finished lot.

This article explains operational inspection concepts and is not a substitute for product-specific quality engineering, regulatory, legal, customs, or contract advice.