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The short answer: a rubber duck order needs two inspection passes, not one. An inline inspection catches a defect at the line so it can be fixed before it repeats, while a final inspection verifies the finished lot against your AQL. Inline is a control, final is a gate; you need both to get a clean shipment.
Why one QC pass is not enough
A final inspection alone checks the finished lot but does nothing to stop a defect from being made. If a duck has a colour mismatch or a seam defect and it is only caught at the end, the whole lot may be rejected. An inline inspection looks at the line as it runs, so a recurring problem is caught and corrected before it spreads across the batch. That is why a good factory runs both.
Inline vs final inspection
| Pass | What it checks | When | Benefit |
|---|---|---|---|
| Inline | Colour, seam, print, shape as it is made | During production | Catches a defect before it repeats |
| Final | Finished lot vs your AQL and spec | Before shipping | Gates the whole shipment |
Inline inspection is about the process: is the colour right, is the seam sealed, is the print in the right place, is the shape consistent. Final inspection is about the product: does the finished lot meet your AQL and your spec. The two answer different questions, so a factory that only does one leaves a gap. Ask which inspections your supplier runs and whether you can be there for either.
What to check at final
At the final gate, confirm the duck against your spec: the dimensions, the colour against the approved sample, the print registration, the squeaker and the drain hole, and the smell or any surface defect. Confirm the AQL you set so the pass or fail is not subjective. A final report records the sample size, the defect count and the conclusion, and that report is the document you hold a supplier to.
What inline catches that final cannot
Inline is where you catch the cause, not just the symptom. If the colour drifts, you need to know at the line so the dye can be corrected; if the print misregisters, that is a set-up fix, not a rework of the lot. A final inspection tells you the lot failed, while an inline inspection tells you why and lets you fix it in time. That is the real value of the first pass.
Inspection and the standard to reference
The level of inspection and the acceptance criteria are set against a sampling standard, so the pass or fail is consistent rather than a judgment call. Referencing a recognised inspection method gives you an objective boundary for how many defects are acceptable. That makes a QC verdict checkable and reproducible across orders.
ASTM covers the test methods that govern duck quality, and a sampling standard defines the inspection level, so reference them so your QC is consistent.
FAQs about rubber duck quality inspection
Why do I need two inspection passes?
Inline controls the process so a defect does not repeat; final gates the finished lot against your AQL. One without the other leaves a gap.
What does an inline inspection check?
Colour, seam, print and shape as the duck is made, so a recurring problem is caught and corrected during production.
What should a final inspection check?
Dimensions, colour against the approved sample, print registration, the squeaker and drain hole, and any surface defect or smell.
What is an AQL?
An acceptable quality limit that sets how many defects are allowed in a lot. It makes the pass or fail objective rather than a judgment.
Should I be present at inspection?
Ask whether you can be there or receive a report. Either way, get the sample size, defect count and conclusion in writing.
Control the process and gate the lot
Ask for both an inline and a final pass, confirm the AQL, and get the report in writing. If you want a rubber duck order that is inspected on both passes, talk to our rubber duck team and see our quality assurance guide.
Related reading: Inline vs Final Inspection: The Two QC Passes Every Duck Order Needs
