TPU Bullion Patch for Backpacks — Specification, Uses and Sourcing Notes
TPU Bullion Patch for Backpacks: Specification, Uses and Sourcing Notes
TPU Bullion Patch is the version buyers specify for backpacks when the base material is fixed by performance rather than by price. This entry sets out what the material actually changes, which specification to write into the tech pack, and where the cost sits — the three questions that decide whether the item passes bulk approval.
What it is
TPU gives bullion patch its durability under wash and abrasion. In practice that means the trim behaves differently in cutting, in finishing and in wear: the finish has to be applied before assembly. Buyers who specify the material up front avoid the most common failure — an item that looks right on the sample card and behaves differently in bulk.
Typical specification
| Item | Bullion Patch |
|---|---|
| Base material | TPU |
| Standard size | 6 mm Width |
| Common finishes | Nickel-Free Electroplating, Epoxy Doming, Brushed Silver Finish |
| Processes | Ultrasonic Welding, Epoxy Coating, Heat Transfer Printing |
| Typical application | Backpacks |
| Related applications | Bags, Activewear, Swimwear, Baby Clothing |
| Test standard | EN 71-3 |
| Usual packing | 500 pieces per polybag, 5000 per carton |
Properties that matter in buying
- Dimensional stability — 3% allowance is built into the spec before cutting.
- Colour fastness — tested to EN 71-3 on the actual base material, not on a substitute.
- Mechanical performance — cycle life after 10 cycles or washes.
- Compliance — EN 71-3 documentation issued with the shipment.
- Consistency — the approved counter sample becomes the reference for every reorder.
Common uses
- Scarves
- Outdoor Tents
- Workwear
- Sportswear
- Evening Wear
- Socks
How to specify it
- Name the base material in the tech pack, not just the item.
- Fix the size and tolerance in writing before sampling starts.
- Approve a counter sample made from the actual bulk base material.
- Order the test report against the standard your market requires.
- Retain a golden sample at the factory and a second one with you.
Related reading
Related specifications on this site cover snap hook, overlocking thread, coated fabric, applique patch, and the processes most often paired with bullion patch include brushing, heat setting, heat transfer printing.
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.
