Film Former
HYDROGENATED BUTADIENE/ISOPRENE/STYRENE COPOLYMER
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A fully hydrogenated triblock copolymer (think saturated SEBS-type rubber) that gives elastic, water-resistant films in long-wear cosmetics. Hydrogenation removes reactive double bonds, leaving a very inert polymer with the usual monomer-residue caveat.
Function
Skin benefits
- Forms elastic, water-resistant films
- Improves wear and rub-off resistance
- Hydrogenation removes reactive double bonds for stability
- Inert, non-reactive cured polymer
Known concerns
- Residual styrene/butadiene monomer concern if poorly stripped
- Limited specific toxicology — niche industrial-grade polymer
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related film formers
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.