POM (Acetal) Buttons: High Gloss, Wear Resistance and Wash Stability
POM — acetal — is the button chosen for its face: high gloss, low friction, and surface hardness that resists scratching where a button rubs against webbing, hardware or a bag body. It also holds dimensions through washing because it absorbs almost no water. This page covers the moulding route, where acetal buttons belong, and how POM compares with nylon and ABS.
Construction: moulded acetal, gloss as a specification
POM buttons are injection moulded from acetal into a steel mould at final shape. The material is semi-crystalline, self-lubricating and wear-resistant; the mould surface decides the gloss, so a polished tool is part of the specification, not a finishing afterthought. Two POM buttons from different tools do not read the same on a bag front.
Water absorption is the quiet advantage: acetal takes up almost no moisture, so a button that starts at 20.0 mm stays at 20.0 mm through wash and humidity. On bags and outerwear, where the button sits beside webbing and hardware, dimensional stability is what prevents wobble and rattle.
Sizes and where acetal earns its price
Acetal runs about 14L–32L. Bags, backpacks, outerwear and utility pieces are the natural home — places where the button face is exposed to abrasion rather than to a pressing line.
| Ligne | Diameter | Typical application |
|---|---|---|
| 14L | 8.9 mm | Bag closures, pocket flaps |
| 18L | 11.4 mm | Outerwear plackets |
| 24L | 15.2 mm | Jackets, utility coats |
| 28L | 17.8 mm | Statement outerwear, bag fronts |
| 32L | 20.3 mm | Large bag and luggage closures |
POM, nylon or ABS: what each material is bought for
| Property | POM (acetal) | Nylon (PA) | ABS |
|---|---|---|---|
| Surface gloss | Highest | Matte to satin | Gloss after plating |
| Scratch / wear resistance | Excellent — self-lubricating | Good | Moderate; plating is the weak layer |
| Dimensional stability in wash | Excellent — minimal water uptake | Good | Good |
| Heat near pressing lines | Not the choice | Yes — heat-resistant grades | No |
The line to remember: POM for the face, nylon for the heat, ABS for the plated look. Choosing on price alone lands the wrong polymer on the wrong garment, and the failure shows up as a scratched face, a distorted button or a lifted finish.
Buyer pitfalls: how POM button orders go wrong
Gloss expectations across tools. Approve the physical counter sample, not a rendering — the same colour on a rougher tool reads duller. If the face is a design feature, specify the finish and hold the retained sample.
Heat exposure. Acetal is not the material for a pressing line. If the garment goes through automatic pressing, the RFQ should say so, and the answer changes to nylon or urea.
Outdoor programmes and UV. For long-exposure outdoor use, ask for a UV-stabilised grade. Standard acetal can chalk on a bag left in sunlight, and the complaint arrives a season after the shipment.
Questions buyers ask about this button
What is a POM button?
A button moulded from POM (acetal) — a semi-crystalline, self-lubricating thermoplastic with a high-gloss moulded face and very low water absorption. It is chosen where the button face takes abrasion and must stay dimensionally stable through wash.
Are POM buttons wash-safe?
Yes — acetal absorbs almost no water, so dimensions and gloss hold through laundering. Heat is the limit, not water: a garment that passes through a hot pressing line needs nylon or urea instead.
POM or nylon buttons for outerwear?
POM when the face is glossy and rubs against webbing or hardware; nylon when the garment runs through a pressing line or needs impact toughness. Specify by the load and the finishing route, not by price per gross.
Sizes and test numbers referenced here are collected on the standards reference page; the full type list lives on the buttons knowledge page.
Buttons are what we manufacture in-house
This type sits inside the button families Senfa produces. MOQs, sampling, lab dips and compliance documents are handled on the product pages — with the lot-test data behind them.
- 01Corozo — Corozo Button? Material, Sizes and Buyer Pitfalls
- 02Shell (MOP) — Shell Button
- 03Horn — Horn Buttons
- 04All 29 button types — the master list