Inspect before you pay the 70% balance, because once the factory has 100% you lose all leverage — returns and litigation over a $30–50k order aren't realistic. A pre-shipment inspection checks the finished, packed batch against your spec using AQL sampling and returns a clear pass/fail while you can still hold payment.
Once you have wired the supplier 100% of the amount, you lose any leverage. If the batch turns out defective, returning the goods to China for rework is almost impossible, and litigating a contract worth $30,000–50,000 makes no economic sense. That is why the only real point of control is a factory inspection before the balance payment. As long as the remaining 70% is still unpaid, the factory has an incentive to fix defects: without your payment it will not receive the main part of the money. Below is how such an inspection works, what exactly the inspector checks, and why this step cannot be skipped when buying by the container.
What a factory inspection is and how it differs from photos in a messenger
A factory inspection is a physical, on-site check of the finished batch at the factory by an independent inspector using a statistical sampling. It is not the same as the photos and videos a manager sends you in a messenger.
The difference is critical for a wholesale buyer:
- Photos show one or two showcase units. A batch of thousands of units may differ in material, assembly and packaging.
- A classic risk is the "sample vs batch" quality swap: the sample is perfect, but mass production is worse. Sampling-based inspection is exactly what reveals this gap. How it works and how a golden sample stops the swap, we covered separately in the guide "Sample OK, batch defective: how factories swap quality".
- Keep a separate focus on how to tell a manufacturer from a trader: an intermediary often does not control the actual factory and cannot guarantee batch consistency.
- The inspector works to your checklist and records the result in a report with photos, measurements and test results — it is a document, not an assurance.
Why the inspection is done right before the balance payment (the 30/70 scheme)
The most common payment scheme with Chinese factories is 30/70 by bank transfer (T/T): a 30% deposit before production starts and a 70% balance before shipment. Those 70% are your leverage.
The logic is simple: the moment 100% is paid, no leverage remains. That is why the recommended approach is to write into the contract that the balance is paid only after the batch has passed a quality inspection. This shifts a significant part of the control to your side and gives the factory a strong incentive to do it right the first time.
What you lose if you pay the balance "on trust"
- Defective goods can rarely be sent back to China for repair or replacement — logistically and cost-wise it is usually not worth it.
- In practice, the deposit is almost never refunded: the factory claims the money has already been spent on materials ("non-refundable deposit").
- For mid-sized orders, the legal route is mostly not worth the cost — even if you are formally in the right.
Bottom line: an inspection before the balance is not an "extra service" but a way to move the moment of detecting a problem to the stage where it can still be fixed at someone else's expense.
Types of inspections: when and what is checked
Depending on the production stage, different kinds of checks are used. For wholesale batches, the most reliable combination is during-production control plus pre-shipment inspection: early defects are caught before they spread across the whole batch.
- Pre-production (PPI) — before production starts, at the raw-materials and components stage: a check of materials and conformity to the specification before launch.
- During production (DUPRO / DPI) — at roughly 20–40% readiness: early defect detection and on-the-fly process correction.
- Pre-shipment (PSI / FRI) — when 100% is produced and ≥80% is packed: the final check before shipment and the balance payment.
- Container loading (CLI) — during container loading: quantity, cargo condition and correctness of loading.
You should not rely on the final PSI alone. If a defect is systemic (for example, in the raw materials), fixing it at the finished-batch stage costs more and eats into your time buffer before shipment.
How a pre-shipment inspection works: step by step
- Booking and agreeing the inspection date with the factory and finalizing the checklist for your product.
- Random sampling of units by the international standard ISO 2859-1 (equivalent to ANSI/ASQ Z1.4).
- Physical check: actual quantity, conformity to the specification, functionality, dimensions, color, labeling and packaging.
- On-site specialized tests — functional and safety-related, depending on the product type.
- A report with photos, measurements and test results.
- A decision based on the report: accept the batch, demand rework, or reject it.
A practical tip: schedule the inspection a few days before shipment and build in a buffer of about two weeks in case of rework. An inspection right up against the deadline strips you of the ability to demand rework without missing the schedule.
AQL: how the "acceptable" number of defects is calculated
AQL (Acceptance Quality Limit) is the maximum allowable defect level of a batch under the ISO 2859-1 standard (third edition — ISO 2859-1:2026). The standard defines how many units to take in the sampling and how many defects are permissible before the entire batch is rejected.
Inspection levels are general I, II and III; by default Level II is applied for most goods, while for critical items a stricter Level III or a lower AQL is used. Defects are classified by severity:
- Critical — a danger to the user or a violation of mandatory regulations; a typical AQL of 0% (the batch is rejected for any).
- Major — affects function or significantly affects appearance; a typical AQL of 2.5%.
- Minor — cosmetic deviations that do not affect use; a typical AQL of 4.0%.
AQL is an agreement between the buyer and the factory, fixed before the inspection. If it is not agreed in advance, you will have no objective "pass / fail" criterion, and the factory will interpret a dispute in its own favor.
Checklist: what the inspector must check before the balance payment
- Actual quantity against the order — a recount of boxes and pallets.
- Conformity to the specification: material, model, article number, configuration.
- Functionality and specialized tests for the product type.
- Dimensions, weight and tolerances.
- Appearance, color, absence of critical defects.
- Labeling, labels, barcodes — to the requirements of the destination market.
- Packaging: export packaging, palletization, box marking.
- Accompanying documentation: packing list, conformity to the order.
Common buyer mistakes and how to avoid them
- Paying 100% upfront or before the inspection — a complete loss of leverage.
- The absence of a rework clause in the contract — the factory is not obligated to redo defects for free.
- An inspection done too late — no time left to fix things before shipment.
- Trusting the manager's photos and approving only the sample without checking the batch. If you are still at the stage of choosing a factory, first figure out how to find and verify a factory in China, in the guide "How to find and verify a manufacturing factory in China: a guide for wholesale importers".
- No agreed AQL and checklist before the start. A baseline reference is the guide "Supplier check before the deposit: a Chinese supplier verification checklist".
Inspection as part of the full Silk Way Sourcing cycle
An inspection is not a standalone service in a vacuum but a link in the full cycle: factory search → supplier verification → production supervision → quality control → logistics. This is what fundamentally sets us apart from companies that only handle delivery: a carrier is not responsible for what actually goes into the container. We cross-check the factory's legal entity against official data — for example, through China's state business registry (gsxt.gov.cn) — and the inspection is carried out by a real person on site before the 70% balance is paid. The founder has 10+ years of working in China, while suppliers and customs on the ground are handled by a Beijing team of native Chinese speakers: for a China-based company to which a foreign buyer wires funds, a face and accountability on the ground are the main lever of trust.
