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BIS-SOYOYL/RAPESEEDOYL ETHYL HYDROXYETHYLMONIUM METHOSULFATE

CAS -
65

Safety score · 0–100

Fine

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

About

A quaternary ammonium conditioning agent derived from plant oils, used in hair and skin care products; moderate sensitization concerns in the EU.

Bis-soyoyl/rapeseedoyl ethyl hydroxyethylmonium methosulfate is a di-acylderived quaternary ammonium salt (methosulfate counterion) used as an antistatic and conditioning agent in rinse-off cosmetic products. Quaternary ammonium compounds with two long-chain alkyl groups (ditallow, dicoco, disoy) are reviewed by SCCS for skin absorption and irritation potential. The methosulfate anion is considered low risk; the ester linkages may hydrolyze under extreme conditions. The EU's conditioning agent review notes that di-alkyl quaternary ammonium compounds are permitted in rinse-off products at up to 2.5% but restricted in leave-on due to inhalation and irritation concerns.

Skin benefits

  • Provides anti-static conditioning for hair
  • Softens skin and improves sensory feel
  • Acts as emulsifier in oil-water formulations

Known concerns

  • Quaternary ammonium - potential skin/eye irritation in susceptible individuals
  • Ester linkage may hydrolyze to fatty acid and ethanolamine derivatives
  • Not recommended for leave-on or aerosol products due to inhalation exposure

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.