PFAS have become one of the most discussed chemical families of the decade – in drinking water, in frying pans and, less famously, in makeup. These "forever chemicals" give foundations their long wear and mascaras their waterproof hold. But the same property that makes them useful is exactly what makes regulators uneasy: they barely break down at all. Here is what PFAS actually are, why they end up in cosmetics, and how to find them in the ingredient list.
What PFAS are – and why "forever"
PFAS stands for per- and polyfluoroalkyl substances: a large family of thousands of synthetic chemicals built around carbon chains studded with fluorine atoms. The carbon–fluorine bond is one of the strongest in organic chemistry, which makes these molecules extraordinarily stable. That stability is the whole point industrially – and the whole problem environmentally. PFAS resist heat, water, grease and, crucially, degradation. Once released, many of them persist in soil, water and living organisms for a very long time.
Why they end up in your makeup bag
PFAS are not there by accident. In cosmetics they add slip and a smooth, silky feel, make products water- and sweat-resistant, and help long-wear formulas actually last. That profile explains where they most often turn up:
- Foundations – especially long-wear and matte formulas.
- Mascara and eyeliner – above all waterproof versions.
- Long-wear and waterproof makeup in general, from lip products to brow gels.
- Some creams, where fluorinated polymers act as skin-conditioning or texture agents.
How to spot PFAS in the INCI list
Many – though not all – PFAS carry a telltale fragment in their INCI name: fluoro, perfluoro, polyperfluoro or the abbreviation PTFE. A few concrete examples:
| INCI name | Role in product | Note |
|---|---|---|
| PTFE (Polytetrafluoroethylene) | Bulking / slip agent | PFAS-family polymer; can carry trace PFOA from manufacturing |
| Perfluorooctanoic Acid (PFOA) | No legitimate role today | Forbidden in EU cosmetics (Annex II); REACH SVHC |
| Polyperfluoromethylisopropyl Ether | Skin conditioning | Fluorinated polymer, part of the PFAS family |
| Names containing "Perfluoro", "Polyfluoro", "Nonafluoro"… | Varies (film formers, emollients) | E.g. Perfluorodecalin, C9-15 Fluoroalcohol Phosphate – the "fluoro" fragment is the cue |
The name check is a useful shortcut, but it is not watertight in either direction: some fluorinated names belong to less-studied substances, and some PFAS hide behind names without an obvious "fluoro". This is where automated ingredient matching earns its keep.
Regulation is tightening
The clearest case is PFOA (Perfluorooctanoic acid). It is prohibited in EU cosmetics under Annex II of the Cosmetics Regulation and is a REACH Substance of Very High Concern, classified as toxic for reproduction and as PBT – persistent, bioaccumulative and toxic. Its harmonised classification also includes suspected carcinogenicity (H351) and reprotoxicity (H360).
Beyond PFOA, the direction of travel is broad: the EU is working toward a wide restriction of PFAS as an entire class under REACH, and several countries and US states have passed or proposed bans on intentionally added PFAS in cosmetics. None of this makes every product with a fluorinated ingredient illegal today – but the regulatory trend points one way.
An honest nuance
Not every fluorinated ingredient is equally studied or equally hazardous. PTFE, for instance, is officially "harmless" in ECHA self-classifications – it is flagged because it belongs to the PFAS polymer family and can carry trace PFOA as a manufacturing contaminant. Skinimalist models this precisely: PTFE is linked to PFOA as a possible contaminant, without pretending PTFE itself carries PFOA's hazard profile. For PFAS as a group, the main concerns are environmental persistence and bioaccumulation rather than acute harm to your skin.
If you want to reduce PFAS
- Start with long-wear and waterproof makeup – that is where PFAS most often do their job.
- Scan the INCI list for "fluoro", "perfluoro" and PTFE.
- Do not panic-toss everything: the issue is long-term persistence, not an acute risk from a single mascara.
Skinimalist recognises PFAS even under alternative names – its database covers 36,700+ ingredients and 91,200+ synonyms – and analyses the label entirely on your device, summing everything up in a score from 1 to 5.
Check your makeup for PFAS with Skinimalist. Scan the label or share a link – and see the score, the flagged forever chemicals and how well the product fits your skin.
Sources: Swedish Chemicals Agency (KEMI) PFAS list; US EPA CompTox PFAS reference list (PFASOECD); EU Cosmetics Regulation (EC) No 1223/2009, Annex II (PFOA prohibition); ECHA REACH Candidate List (SVHC) and CLP harmonised classifications (H351, H360); ongoing EU REACH restriction proposal for PFAS as a class. This guide is decision support, not medical advice.