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Hair Conditioning

SILICONE QUATERNIUM-20

CAS -
65

Safety score · 0–100

Fine

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

About

A silicone-grafted quaternary ammonium polymer used as a durable hair conditioner. Deposits well on hair; build-up over time is the main caveat.

Silicone Quaternium-20 is one of a family of amodimethicone/polyquaternium hybrids that combine silicone (polydimethylsiloxane) backbones or grafts with quaternised nitrogen side chains. The cationic functionality helps the silicone deposit durably on damaged (negatively charged) hair, giving long-lasting smoothing and heat protection. Safety profile for the class is generally favourable — low dermal absorption, low irritation. Environmental persistence of silicone fragments and long-term hair build-up are the main caveats. No EU restrictions.

Function

HAIR CONDITIONING, SKIN CONDITIONING

Skin benefits

  • Silicone-grafted cationic polymer — long-lasting hair conditioning
  • Reduces flyaways and smooths cuticle
  • Heat-protective effect

Known concerns

  • Silicone bioaccumulation concerns for the class
  • Build-up on hair over repeated use
  • Limited specific toxicology data

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.