Nylon Buttons (PA): Heat Resistance for Pressing-Line Garments
Nylon — polyamide, PA66 in most button grades — is the material chosen when the garment goes through automatic pressing equipment. It takes 150 °C and above, resists impact and keeps its shape through industrial laundering. This page covers the grades, the sizes, how nylon differs from urea and cast polyester in the RFQ, and the documentation a recycled-nylon claim needs.
Construction and grades
Nylon buttons are injection moulded from polyamide into a steel mould at final shape. The grade is the specification: standard PA66 covers most shirt and workwear programmes, and heat-resistant grades are marked as such on the bag and the quotation. Two buttons that look identical can behave differently at 150 °C, which is why the grade belongs on the tech pack rather than in a supplier's memory.
The material also brings toughness: nylon resists impact and flexing better than most button plastics, so it survives the repeated loading of a workwear placket without stress cracking at the holes.
Sizes and use
Nylon runs about 14L–28L in practice — shirt, workwear and uniform territory. Colours are solid; there is no horn or pearl effect in this material.
| Ligne | Diameter | Typical programme |
|---|---|---|
| 14L | 8.9 mm | Work shirts, uniform cuffs |
| 16L | 10.2 mm | Shirts through pressing lines |
| 18L | 11.4 mm | Workwear, utility shirts |
| 20L | 12.7 mm | Overshirts, light jackets |
| 24L | 15.2 mm | Uniform outer layers |
Nylon, urea or cast polyester: the RFQ question to ask
All three can be white, 18L and 4-hole, and all three will pass a wash test. The difference appears in the finishing route and the impact load:
| Requirement | Nylon (PA) | Urea | Cast polyester |
|---|---|---|---|
| Automatic pressing, 150 °C+ | Yes, heat-resistant grades | Yes | No |
| Impact and flex toughness | Highest | Moderate — can chip at thin rims | Moderate |
| Horn / shell / pearl effects | No | No | Yes |
| Recycled-content claim | Possible — GRS with TC documents | Rarely | Possible (rPET grades) |
If a recycled-nylon claim is going into brand marketing, ask for the GRS scope certificate and transaction certificates before the claim is written, not after the goods ship. A claim without paperwork is a compliance problem, not a marketing one.
Buyer pitfalls: how nylon button orders go wrong
Grade substitution. Standard PA quoted, heat-resistant grade expected. Name the grade and the temperature on the trim card, and ask for the material certificate with the approval sample.
Colour drift between lots. Nylon is dyed in the mass; a lab dip per colour and a Delta E limit against the approved sample remain the control, exactly as for any dyed trim.
Claims ahead of documents. Recycled content needs chain-of-custody paperwork. Ordering the documents after the hangtag is printed is the expensive sequence.
Questions buyers ask about this button
What temperature can nylon buttons withstand?
Heat-resistant PA grades take 150 °C and above, which covers automatic pressing equipment. The grade has to be named on the trim card — standard and heat-resistant grades look identical and behave differently.
Are nylon buttons available in recycled content?
Yes, in GRS-certified grades. The claim needs the scope certificate and transaction certificates (TC) covering the actual shipment — ask for them before the brand copy is written.
Nylon or urea buttons for workwear shirts?
Both are heat-safe. Nylon brings more impact and flex toughness; urea is the classic uniform button with a harder, more traditional face. The deciding line is usually the pressing route plus the drop and flex loads the placket sees.
Sizes and test numbers referenced here are collected on the standards reference page; the full type list lives on the buttons knowledge page.
Senfa manufactures this button in-house
MOQs, sampling and compliance documents are covered on the product page — the commercial side of the same button, with the lot-test data behind it.
- 01Corozo — Corozo Button? Material, Sizes and Buyer Pitfalls
- 02Shell (MOP) — Shell Button
- 03Horn — Horn Buttons
- 04All 29 button types — the master list