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Emollient

PERFLUOROBUTYLETHYL STEARYL DIMETHICONE

CAS 915223-67-5 Updated
35

Safety score · 0–100

Caution

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

About

A silicone with a stearyl chain on one side and a perfluorobutyl (C4 PFAS) tail on the other — gives long-wear waterproofing. Performance is real, but EU REACH is restricting cosmetic PFAS and the molecule can degrade to persistent short-chain PFAS.

Function

ANTIFOAMINGSKIN CONDITIONING - EMOLLIENTHAIR CONDITIONINGDISPERSING NON-SURFACTANTSLIP MODIFIERSURFACE MODIFIER

Skin benefits

  • Exceptional water and oil repellency
  • Smooth slip on skin and hair
  • Stable to heat and chemicals

Known concerns

  • Contains a perfluoroalkyl (PFAS) C4 chain
  • EU is restricting PFAS in cosmetics under REACH
  • Environmental persistence and potential bioaccumulation
  • Possible degradation to short-chain PFAS like PFBA

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 — always read the physical product label and consult a healthcare professional for personal concerns.