The first container is a showcase. The factory's best people handle it, the best raw material goes into it, and management watches every step. By the third order, your product is routine. Cheaper inputs creep in, a subcontractor takes the overflow, and nobody is watching as closely. Nothing dishonest need have happened; the attention simply moved on.
What prevents it
- A written specification with the approved sample as the reference, signed by the factory, so "the same as last time" has a definition.
- A test on every lot at an accredited laboratory, with samples drawn by someone who works for you, not by the factory.
- A pre-shipment inspection of the finished goods against the spec before the container is booked, with the right to reject.
- Loading supervised, with photos of the empty container, the loading and the seal, so what was inspected is what was shipped.
- A scorecard after each order shared with the factory. Factories pay attention to what is measured.
The cost of not doing it
One rejected container usually costs more than a year of inspection and testing. The arithmetic is why established importers treat per-lot testing as a fixed cost of buying from anywhere, not an optional extra.