Emulsifier
AMMONIUM STYRENE/MA COPOLYMER
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
An ammonium salt of styrene-maleic anhydride copolymer used as an emulsion stabilizer. Cured polymer is high-MW and inert; the styrene monomer is an IARC 2A probable carcinogen, so residual control is essential.
Function
Skin benefits
- Stabilizes oil-in-water emulsions
- Forms protective colloidal films
- Effective at low use levels
Known concerns
- Residual styrene monomer is an IARC 2A probable carcinogen
- Residual maleic anhydride is a respiratory sensitizer
- Modern grades control residuals to <50 ppm
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related emulsifiers
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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.