Copper Two-Way Separating Zipper for Backpacks — Specification, Uses and Sourcing Notes
Copper Two-Way Separating Zipper for Backpacks: Specification, Uses and Sourcing Notes
Copper Two-Way Separating 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
Copper gives two-way separating zipper its drape and hand feel. In practice that means the trim behaves differently in cutting, in finishing and in wear: shrinkage allowance has to be built into the spec. 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 | Two-Way Separating Zipper |
|---|---|
| Base material | Copper |
| Standard size | 12 mm Width |
| Common finishes | Black Nickel Finish, Chrome Plating, Yarn-Dyed Finish |
| Processes | Calendering, Water Repellent Finishing, Injection Moulding |
| Typical application | Backpacks |
| Related applications | Evening Wear, Skirts, Sportswear, Uniforms |
| Test standard | GB 18401 |
| Usual packing | 500 pieces per polybag, 10000 per carton |
Properties that matter in buying
- Dimensional stability — 1% allowance is built into the spec before cutting.
- Colour fastness — tested to GB 18401 on the actual base material, not on a substitute.
- Mechanical performance — abrasion resistance after 50 cycles or washes.
- Compliance — GB 18401 documentation issued with the shipment.
- Consistency — the approved counter sample becomes the reference for every reorder.
Common uses
- Sneakers
- Socks
- Kidswear
- Blazers
- Sleepwear
- Scarves
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 pom pom trim, two-way separating zipper, satin fabric, stud trim, and the processes most often paired with two-way separating zipper include mercerising, bonding, singeing.
If you are comparing suppliers, send us the spec they quoted against. We will quote the same spec and show you where the difference sits.
