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.
About
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
Check your shelf
Find ISOBUTYLENE/STYRENE COPOLYMER in your products.
Scan any cosmetic product with LuxSense to see if it contains ISOBUTYLENE/STYRENE COPOLYMER and get a full ingredient breakdown with safety scores.
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.