Film Former
ISOBUTYLENE/STYRENE COPOLYMER
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A hydrocarbon copolymer of isobutylene and styrene used as a film former and viscosity modifier. Cured polymer is inert; the styrene monomer is an IARC 2A probable carcinogen, so residual control is the safety lever.
Skin benefits
- Inert hydrocarbon copolymer
- Film-forming and viscosity control
- Stable across formulations
Known concerns
- Residual styrene monomer — IARC 2A probable carcinogen
- Not biodegradable
- Modern grades control styrene to <50 ppm
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, so always read the physical product label and consult a healthcare professional for personal concerns.