POLYQUATERNIUM-31
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A cationic polymer used in hair and skin formulations to provide conditioning benefits and substantivity to surfaces.
Polyquaternium-31 is a cationic polymer derived from acrylonitrile homopolymerization with quaternary ammonium modification, used as a film-forming and conditioning agent. It is not listed in EU Cosmetics Regulation Annexes II or III. The primary concern relates to residual acrylonitrile monomer content, which is regulated. The quaternary ammonium structure provides substantivity to skin and hair proteins but is not associated with significant irritation at use concentrations.
Skin benefits
- Provides film-forming conditioning benefits to skin and hair
- Improves wet combing and sensory feel of hair care products
Known concerns
- Residual acrylonitrile monomer is a regulated impurity
- Not recommended for use in oral care or lip products due to cationic nature
References
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.