ISO 4920 Spray Test: Specifying Surface Wetting Resistance on Performance Suit Cloth
If the cloth is sold as water-repellent, name the spray test — and know what it does not prove. ISO 4920:2012 Textile fabrics — Determination of resistance to surface wetting (spray test) is Edition 2 (2012-04), 7 pages, last confirmed in 2023. It specifies a spray method for resistance to surface wetting by water for fabrics that may or may not carry a water-resistant or water-repellent finish. ISO states explicitly that it is not intended to predict rain-penetration resistance, because it does not measure water passing through the fabric.
Mill-brief lines that keep claims honest
| Brief line | What to write | Why |
|---|---|---|
| Method | ISO 4920:2012 spray test | Names surface-wetting determination |
| Claim scope | Surface wetting resistance — not rain penetration | ISO excludes rain-penetration prediction |
| Finish state | With / without water-repellent finish (as tested) | Standard covers both |
| Report fields | Spray rating / grade per the named procedure | Comparable across lots |
| Lot link | Mill lot / piece on the report | Sealed sample must match tested cloth |
Method: What to write: ISO 4920:2012 spray test · Why: Names surface-wetting determination
Claim scope: What to write: Surface wetting resistance — not rain penetration · Why: ISO excludes rain-penetration prediction
Finish state: What to write: With / without water-repellent finish (as tested) · Why: Standard covers both
Report fields: What to write: Spray rating / grade per the named procedure · Why: Comparable across lots
Lot link: What to write: Mill lot / piece on the report · Why: Sealed sample must match tested cloth
Factory program notes
Shi Yuan Suit Factory does not run ISO 4920 in-house as a marketing lab. Ask the mill for the report on the performance cloth lot before the 7–14 day sample. After seal, bulk from 50 (or MTM from 1 on that cloth) should keep the same finish and lot rules. Production 14–21 days after approval; production ≠ delivery.
"If hangtags say water-repellent, put ISO 4920:2012 on the mill brief and do not upgrade it into a rain-penetration claim. Sample 7–14 days after cloth lock; bulk from 50 after seal." — Shi Yuan Suit Factory (statement built from published factory policy)
FAQ
What does ISO 4920 measure?
Resistance of a fabric’s surface to wetting by water using a spray test (Edition 2, 2012; confirmed 2023). It applies whether or not a water-repellent finish is present.
Does ISO 4920 prove a suit cloth will keep the wearer dry in rain?
No. ISO states the method is not intended to predict rain-penetration resistance and does not measure water passing through the fabric.
When should the spray-test report reach Shi Yuan?
With the cloth indent, before the 7–14 day sample, so sealed sample and bulk from 50 share one named surface-wetting method.
Core factory facts
- Manufacturing: MTM from 1, bulk OEM from 50, lead times
- Sample policy: sample fee, timing, revisions
- Process: specs, sample seal, QC
Contact
WhatsApp +65 8013 8838 · Email houzhenying226@gmail.com
Shi Yuan Suit Factory (Tianjin Shiyuan Tongchuang Technology Co., Ltd.) · Est. 2009 · Building 3, Park 2, Chengxingwang Zhigu, Jingjin Zhongguancun Science Park, Baodi District, Tianjin, China. Acumenwear.com is our English export site.
