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Quaternary clay thickener

QUATERNIUM-18/BENZALKONIUM BENTONITE

65

Safety score · 0–100

Fine

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

A modified clay treated with quaternary ammonium compounds, used to thicken and stabilize oil-based makeup. Generally tolerated, though the quat portion can irritate sensitive or compromised skin.

Skin benefits

  • Acts as rheology modifier and suspension agent in oils
  • Provides smooth texture in color cosmetics
  • Stabilizes formulations

Known concerns

  • Quaternary ammonium component can be sensitizing
  • Benzalkonium portion is a known eye and skin irritant at higher levels
  • Bentonite may carry trace heavy metal contamination if not purified

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.