Case Study: Custom O-Ring for an Amazon Private Label Seller in Portugal
Source:Enamel Pin Badges /
Time:2026-09-18
O-Ring for an Amazon Private Label Seller in Portugal
An Amazon Private Label Seller approached us with a o-ring requirement for the Portugal market. The brief was specific: a defined look, a hard launch date and a unit cost that had to survive freight and duty. This case study records what was specified, what went wrong in sampling and how the bulk order was delivered.
The challenge
- A spec that lived in an email instead of a tech pack
- An interlining that bubbled after the first press
- A zipper puller that broke under pull test at the warehouse
What we specified
| Item | O-Ring |
|---|---|
| Client type | An Amazon Private Label Seller |
| Market | Portugal |
| Order volume | 2,000 pieces across 2 specifications |
| Base material | Nylon |
| Standard size | 38 mm Width |
| Finish | Epoxy Doming |
| Sampling rounds | 4 |
| Delivery window | 4 weeks from PO to ex-factory |
| Compliance | ISO 9001 |
How it was resolved
- We rebuilt the specification around Nylon and locked the tolerance before bulk.
- The finish was moved to Brushed Silver Finish after strike-off tests showed better durability.
- A pre-production sample was approved and retained as the golden reference.
- Production ran with in-line inspection and a mid-run photo report.
- Cartons were packed to the client's own barcode and ratio specification.
Result
- 2,000 pieces delivered inside the 4-week window.
- Unit cost held within 1.5% of the original quotation.
- Inspection-related rejection stayed under 0.5%.
- The specification is now on file, so reorders reproduce the approved sample.
What we would repeat
Keep one accountable owner on both sides. Most delays come from hand-offs, not from machines.
Planning something similar?
Send the reference sample or tech pack and we will come back with a costed specification, a sampling timetable and the compliance documents your market requires.
