TPU Waterproof Zipper for Backpacks — Specification, Uses and Sourcing Notes
TPU Waterproof Zipper for Backpacks: Specification, Uses and Sourcing Notes
TPU Waterproof Zipper 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 waterproof zipper its strength and surface character. In practice that means the trim behaves differently in cutting, in finishing and in wear: plating and coating adhesion must be tested on the actual base. 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 | Waterproof Zipper |
|---|---|
| Base material | TPU |
| Standard size | 9 mm Width |
| Common finishes | Piece-Dyed Finish, Sandblasted Finish, Glossy Enamel Coating |
| Processes | Embroidery, Anti-Static Finishing, Embossing |
| Typical application | Backpacks |
| Related applications | Evening Wear, Luggage, Sportswear, Backpacks |
| Test standard | WRAP |
| Usual packing | 200 pieces per polybag, 2000 per carton |
Properties that matter in buying
- Dimensional stability — 2% allowance is built into the spec before cutting.
- Colour fastness — tested to WRAP on the actual base material, not on a substitute.
- Mechanical performance — abrasion resistance after 50 cycles or washes.
- Compliance — WRAP documentation issued with the shipment.
- Consistency — the approved counter sample becomes the reference for every reorder.
Common uses
- Blazers
- Dresses
- Underwear
- Jeans
- Suits
- Gloves
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 shoulder pad, embroidered patch, collar canvas, satin fabric, and the processes most often paired with waterproof zipper include sanforising, garment washing, screen printing.
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