Film Former

STYRENE/STEARYL METHACRYLATE CROSSPOLYMER

CAS 91838-84-5 Updated April 2026

58

Safety score · 0–100

Moderate

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

About

A styrene-based crosspolymer used for long-wear film effects. Inert as cured polymer, but residual styrene monomer is the toxicology concern.

Function

ABSORBENTSKIN CONDITIONING

Skin benefits

Film former
Long-wear
Texture aid

Known concerns

Residual styrene monomer (IARC 2B)
Microplastic-class polymer

References

EU

EU CosIng database

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

Related film formers

ACRYLONITRILE/METHACRYLONITRILE/METHYL METHACRYLATE COPOLYMER

BIS-HEMA POLY(CAPROLACTONE NEOPENTYL GLYCOL)/IPDI COPOLYMER

BIS-HEMA POLY(DIGLYCOL ADIPATE)/IPDI COPOLYMER

BIS-HEMA POLYNEOPENTYL GLYCOL ADIPATE/IPDI COPOLYMER

BIS-HYDROXYETHYL ACRYLATE POLY(1,4-BUTANEDIOL)-9/TMHDI COPOLYMER

BIS-HYDROXYPROPYLTRISILOXYL IPDI/PEG-23 COPOLYMER

BIS-METHOXY PEG-10 DIMETHYL MEA/HDI/BIS-PEG-10 DIMETHICONE COPOLYMER

BIS-PENTAERYTHRITOL TRIACRYLATE/SMDI COPOLYMER

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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.