Film Former
HYDROGENATED STYRENE/BUTADIENE COPOLYMER
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A hydrogenated synthetic film former (CAS 66070-58-4) used to create smooth flexible coatings. Hydrogenation improves stability versus the raw copolymer; residual styrene is the primary caveat for cosmetic-grade material.
Function
Skin benefits
- Smooth flexible film former
- Hydrogenation improves stability
- Less reactive than raw copolymer
- Used in long-wear formulations
Known concerns
- Possible residual styrene monomer — IARC Group 2A
- Not biodegradable
- Limited human dermal safety data
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.