Quality inspection explained
When to inspect, what the common inspection types are, and why checking before shipment is far cheaper than after.
Inspection is leverage, not paperwork
The value of an inspection is not the report. It is where in the process the report arrives. A problem found while the goods are still in the factory is a conversation about rework. The same problem found in your warehouse is a choice between accepting it, scrapping it, or paying to send it back to the other side of the world.
That is the whole argument. Inspection buys you the ability to say no while saying no is still cheap, and while the balance of your money has not yet been paid.
The four points you can inspect at
Before production, an inspection checks that the materials and components on site are what you specified. This is the only stage at which a wrong material can be fixed without remaking anything, and it is the stage most buyers skip.
During production, usually when the first ten to twenty per cent is complete, a check catches a systematic error early. If a whole run is being made a few millimetres out or in the wrong shade, you want to know at unit two hundred rather than unit five thousand.
Pre-shipment, when production is finished and packed, is the standard inspection and the one most people mean. It is your last independent look before the goods leave, and it is normally the trigger for releasing the balance of payment.
Container loading supervision checks that what was inspected is what actually goes into the container, correctly packed and counted. It matters most where mixed products, high value or fragile goods are involved.
How the accept or reject decision is made
Nobody checks every unit. An inspector draws a sample from the finished batch according to a recognised sampling standard, inspects it against your specification, and the batch is accepted or rejected against limits agreed in advance.
Defects are normally graded. A critical defect makes the product unsafe or unsaleable. A major defect is one a customer would likely notice and object to. A minor defect is a cosmetic imperfection that most buyers would accept. You agree how many of each is tolerable in a batch before production starts.
The important part is that these limits are in the order document. An inspection without agreed limits produces an opinion, and an opinion is exactly what you cannot enforce. With limits, a failed batch is a fact, and the conversation moves straight to rework, sorting, discount or rejection.
What to give the inspector
The written specification, the approved sample or clear photographs of it, the packing and labelling requirements, and the defect standard. An inspector without a specification can only tell you the goods exist, are the right count, and look broadly like the photograph. That is worth very little.
Be explicit about what to measure and how many of them. Which dimensions, which functions to test and on how many units, whether packaging is opened, whether barcodes are scanned, whether cartons are weighed. Also say what to photograph, because the photographs are what you will actually use if there is a dispute.
If your goods are regulated, ask the inspector to verify markings and that the documentation matches the product configuration in front of them. Marking errors are common, cheap to fix in the factory, and expensive to fix once the goods are in the UK.
Who should do it
A third-party inspection firm is the usual route. They are independent, they charge by the day, and for most orders the cost is small next to the value of the batch. Book earlier than feels necessary; inspectors are scheduled in advance and the peak before Chinese New Year is genuinely constrained.
A factory's own quality report is useful information, not independent evidence. It is written by the party being assessed, and it usually arrives when the balance payment is due.
An agent acting for you combines the two roles: someone who knows your specification, has seen your previous batches, and will still be dealing with the supplier next month. The value is continuity, since knowing what went wrong last time is what stops it recurring.
What to do when a batch fails
Do not release the balance payment. That leverage exists for exactly this moment and it evaporates the instant the money moves.
Ask for the root cause rather than a promise. A supplier who explains what happened and what changes is likelier to fix it than one who apologises and offers a discount.
Then choose deliberately between rework, sorting at the factory's cost, a discount that genuinely reflects the loss, or rejection. Re-inspect after rework, and say so up front, because a rework that is not re-inspected is a hope.
And write the failure into the specification so it cannot happen the same way twice. Your defect list after order one is the most valuable document you own going into order two.
Frequently asked questions
When should I inspect goods from China?
Pre-shipment, once production is complete and packed, is the standard and the one to tie your balance payment to. On a first order or a complex product, add a during-production check at around ten to twenty per cent complete so a systematic error is caught early.
How much does a third-party inspection cost?
Firms usually charge by inspector-day, and for most orders it is small relative to the value of the batch. Compare it not to the order value but to the cost of discovering the same problem in your UK warehouse.
What is an AQL inspection?
A sample is drawn from the finished batch according to a recognised sampling standard and checked against your specification, with the batch accepted or rejected against defect limits agreed in advance. The limits must be in the order, otherwise the inspection produces an opinion rather than a decision.
Can I rely on the factory's own quality report?
Treat it as useful information rather than independent evidence. It is produced by the party being assessed and usually arrives when the balance is due. Independent inspection is what gives you something to act on.
What should I do if the inspection fails?
Hold the balance payment, ask for root cause rather than an apology, and choose deliberately between rework, sorting at the factory's cost, a discount reflecting the real loss, or rejection. Re-inspect after any rework, and agree that up front.