Film Former
ISOBUTYLENE/ISOPRENE COPOLYMER
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
Butyl rubber used as a thick, water-resistant film former in cosmetics — think long-wear textures. Inert and non-absorbed, but petroleum-derived with microplastic concerns in rinse-off.
Function
Skin benefits
- Inert film former and rheology modifier
- Adds water resistance
- High-molecular-weight, non-absorbed
Known concerns
- Petroleum-derived polymer
- Unwanted residual monomers possible if low-grade
- Microplastic considerations in rinse-off
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.