Film Former
HYDROGENATED BUTYLENE/ETHYLENE/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 styrene block copolymer used as an inert film former for long wear. Non-reactive on skin; cosmetic grades are refined to remove residual styrene.
Function
Skin benefits
- Inert hydrocarbon film former
- Improves wear of makeup and sunscreens
- Non-reactive on skin
Known concerns
- Trace residual styrene monomer concern in unrefined grades
- Limited skin penetration so systemic risk minimal
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.