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Surface Treatment

HEXYLTRIMETHOXYSILANE

CAS 3069-19-0
50

Safety score · 0–100

Moderate

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

A silane coupling agent used to surface-treat mineral pigments. Once reacted onto a surface it is inert; the free monomer is a skin/eye irritant and releases methanol on hydrolysis.

Function

SKIN CONDITIONING

Skin benefits

  • Pigment surface treatment
  • Water repellency
  • Powder dispersion

Known concerns

  • Methanol byproduct on hydrolysis
  • Skin/eye irritation in free form

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.