ForMatter/Finishes/coating/Durable water repellent (DWR)
finish_coating_dwr_textile

Durable water repellent (DWR)

coating · matte · DWR, Teflon DWR, C8 / C6 / C0 fluorocarbon, non-fluorinated DWR, Nikwax

A polymer coating sprayed or dipped onto fabric that lowers surface energy so water beads instead of soaking in. The finish on Gore-Tex shells, Patagonia rain jackets, the polyester pants of every modern hiker. Wears off over washes; refresh with reapplication. Reads as no visible change to the fabric until you watch a drop bead off it.

Two main families: long-chain perfluorocarbon (C8 fluorotelomer) — historically the standard, exceptional performance, but bioaccumulative PFAS concern triggered a phase-out by major brands 2015–2025; short-chain (C6) — interim replacement, less persistent, similar performance; non-fluorinated (C0) — silicone, dendrimer, paraffin-wax based, the 2020s standard for major outdoor brands. Applied by pad-bath / spray / foam at finishing stage; cured at 130–160 °C to crosslink. Performance: contact angle ≥ 110° beading, AATCC 22 spray rating ≥ 90 fresh, drops to 60–70 after 20 washes. Refreshable in home wash cycle (Nikwax TX.Direct, Granger's Performance Repel) — wash, tumble-dry to reactivate. Distinct from waterproof membrane (Gore-Tex, eVent) which is the layer beneath; DWR is the surface treatment that keeps the face fabric from saturating and chilling.

character — no visual change to fabric, water beads off, performance / outdoor register.

Finish properties

  • levelmatte
  • subcategoryfluorocarbon or hydrocarbon water-shed treatment
  • applies totextile

Incompatibilities

  • C8 PFAS-restricted regions (REACH, US state-level bans 2024+) for long-chain formulations

Second life

reversibilitymoderate — most coatings can be stripped chemically (methylene chloride for paint, NaOH for some powder coats) or thermally / mechanically (sandblasting). Some specialty coatings (DLC, ceramic) require commercial-service strip.
blocks substrate recyclingno
renewabilityfield- to shop-renewable — most paint and clear coats can be touched up or re-coated in service; powder coat and PVD coatings require a coating-house re-application.

SSPC / NACE surface-coating standards; manufacturer technical literature for the specific coating chemistry.

Citations