When a buyer says they want a third-party inspection before shipment, a good factory says "good." A supplier who pushes back is telling you something. We would rather hand the inspector our own checklist than have them invent one, so here is what we run on the line — use it on us or on anyone else.
Sampling, not 100%
Nobody opens every carton. Furniture QC normally uses AQL sampling (the ISO 2859-1 / ANSI Z1.4 tables), where the inspector pulls a statistically set sample from the lot and counts critical, major and minor defects against agreed limits. Agree the AQL level before the booking, not after a fail — that argument is much easier to have in advance.
What to actually check on a chair
The defects that come back as customer complaints are boring and predictable, so the checklist is too:
- Gas lift: does it hold height under load without sinking; is the class stamp present and correct.
- Casters: all five fitted, roll freely, no missing or loose stem.
- Tilt mechanism: engages and locks; tension knob works through its range.
- Base: no cracks at the spokes; correct material (nylon vs aluminum as ordered).
- Upholstery / mesh: no loose threads, even tension, no glue marks; foam matches ordered density.
- Assembly & hardware: bolts torqued, the right Allen key and instructions in the carton.
- Carton & marks: drop-resistant packing, correct shipping marks, count matches the load plan.
On top of the visual check, a function test on the sampled units catches the failures a photo never will — sit, recline, lock, swivel, roll.
The trade-off on inspection timing
Here is the honest tension. A during-production inspection catches problems while there is still time to fix them, but it cannot check the final packed count. A pre-shipment inspection checks the finished, packed goods but leaves little room to rework a systemic fault without delaying the vessel. For a first order with a new supplier, we recommend both — accept the small extra cost, because a rework discovered at pre-shipment on a full container is the expensive version of the same problem. For repeat orders on a stable line, pre-shipment alone is usually enough. The pre-shipment inspection guide at ChairManufacturer.net covers how to brief a third-party agency and what to include in the scope of work.
We build our chairs to BIFMA/EN test methods and welcome your inspector or a third-party agency at the factory; lab testing can be arranged per order. If you want our full inspection sheet to brief your agent, ask through the contact form or [email protected]. Our ODM/OEM workflow shows where inspection sits in the schedule.