Since October 10, the European Union bans Undecafluorohexanoic acid (PFHxA) — a 'forever chemical' widely used for stain resistance in garments — above 25 parts per billion (ppb) per homogeneous material, closing a substitution route many fashion brands relied on after earlier PFAS restrictions.

The regulation, adopted in 2024 as an amendment to Reach (the EU's 2006 Registration, Evaluation, Authorization and Restriction of Chemicals law), came into force after a two-year transition period. It covers PFHxA, its salts and related substances across textiles, leather, furs and hides in clothing, footwear and accessories for the general public. Cosmetics and paper and cardboard food containers fall under the same restriction.

The limits are strict and structural. Each homogeneous material in a finished product must stay below 25 ppb for the sum of PFHxA and its salts, and below 1,000 ppb for the sum of its related substances.

What does the ban change in practice?

The measurement method matters as much as the threshold. The EU does not test a garment as a single unit. A jacket, for instance, counts as several materials — its outer shell fabric, its waterproof membrane, its durable water repellent finish and its lining must each be tested separately.

That is the compliance burden brands now carry, according to Naomie Halioua, co-founder and chief data officer of Cleo, an AI platform for product compliance, who explained the material-by-material approach in an analysis of the rule.

The stakes are higher than a simple chemical swap. PFHxA was the industry's designated replacement for another PFAS compound already banned by the EU. Brands that reformulated after that earlier restriction now face a second reformulation for the European market, with testing obligations extending down to every component and finish in the bill of materials.

Per- and polyfluoroalkyl substances (PFAS) are man-made compounds that can take thousands of years to break down, hence the nickname 'forever chemicals.' A 2023 toxicological review by the U.S. Environmental Protection Agency found evidence suggesting PFHxA can harm the liver 'given sufficient exposure conditions.'

Who pays, and what is still coming?

For sourcing and supply-chain teams, the immediate questions are capacity and cost: which mills and finishers can deliver PFHxA-free durable water repellents at scale, what retesting of existing article libraries will cost, and who absorbs it — brand or vendor. The source material does not say. Nor does it quantify the share of current EU-bound inventory that fails the 25 ppb threshold.

The rule also lands on top of a growing stack of EU obligations. Brands must already verify product origins and account for end-of-life outcomes; they must now also document chemical composition at the component level.

More restrictions are scheduled. Next year, the EU will extend the PFHxA ban to textiles outside the clothing category — bed linen, curtains and carpets among them — giving home and interior suppliers a shorter runway than apparel makers received.

And the EU's targeted approach is not the outer limit. Denmark and France have already moved ahead with broader PFAS bans, meaning a product compliant under the EU-wide rule may still fail national rules in those markets. Suppliers shipping pan-European assortments will need to design to the strictest applicable standard rather than the bloc-wide floor.

Whether the EU eventually moves from substance-by-substance restrictions to a comprehensive PFAS framework remains open. For now, the burden of proof sits with the supply chain: test each material, document each finish, and expect the next ban to arrive on schedule.