Weathered outdoor gear sheds PFAS into the environment
Six months on a Sydney rooftop cut total fluorine in DWR fabrics and raised residual PFAAs up to 100-fold, showing outdoor textiles as PFAS sources.
Source
An Outdoor Aging Study to Investigate the Release of Per- And Polyfluoroalkyl Substances (PFAS) from Functional Textiles
What they did
Authors weathered C4, C6, and C8 side-chain fluoropolymer polyamide fabrics for 3 and 6 months on a Sydney rooftop, then abraded and washed them, tracking total fluorine, targeted PFAAs, TOP-assay precursors, fiber damage, and water repellency versus sealed and untreated controls.
What they found
After 6 months, total fluorine fell 4%, 26%, and 52% for C6, C8, and C4 finishes. After weathering plus abrasion/washing, losses reached 20–71%. PFAAs in remaining fabric rose up to 100-fold (PFDoDA from 2 to 834 ppb). Untreated cloth picked up no PFAS from air, so increases were precursor transformation, not deposition.
The limits
What it doesn't show
Spiked PFAAs were 74–92% lost to rain, so remaining-fabric PFAAs underestimate total emissions. n=2 weathered replicates per finish, and Sydney UV is a harsh-use scenario, not a typical closet.
Key terms
- PFAS / PFAA
- Per- and polyfluoroalkyl substances; PFAAs are the persistent acid end-products such as PFOA and PFDoDA.
- Side-chain fluorinated polymer (SFP)
- A durable water-repellent finish with fluorinated side chains on a nonfluorinated backbone.
- DWR
- Durable water repellent coating applied to outdoor and protective textiles.
- TOP assay
- Total oxidizable precursor assay that converts hidden PFAS precursors into measurable PFAAs.
- Total fluorine (TF)
- Bulk organic fluorine remaining in the fabric, a proxy for remaining SFP finish.
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Quiz yourself
Outdoor weathering of SFP textiles:
Common questions
Did rain just wash factory PFAAs off?
Spiked PFAAs did wash off, yet weathered SFP fabrics still gained up to 100-fold more PFAAs than unexposed cloth—evidence of precursor conversion.
Could the rooftop have deposited PFAS from air?
No. Untreated fabrics after 6 months had no observable PFAAs.
Which finish lost the most total fluorine?
The C4 (C4F9) treatment: 52% after weathering, 71% after abrasion and washing.
Why does this matter for regulation?
Occupational and outdoor textiles can emit PFAS during use, not only at manufacture or disposal.
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