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Film Former

HYDROGENATED BUTADIENE/ISOPRENE/STYRENE COPOLYMER

CAS 132778-07-5
78

Safety score · 0–100

Fine

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

A fully hydrogenated triblock copolymer (think saturated SEBS-type rubber) that gives elastic, water-resistant films in long-wear cosmetics. Hydrogenation removes reactive double bonds, leaving a very inert polymer with the usual monomer-residue caveat.

Function

FILM FORMING

Skin benefits

  • Forms elastic, water-resistant films
  • Improves wear and rub-off resistance
  • Hydrogenation removes reactive double bonds for stability
  • Inert, non-reactive cured polymer

Known concerns

  • Residual styrene/butadiene monomer concern if poorly stripped
  • Limited specific toxicology — niche industrial-grade polymer

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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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.