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PEG-9 DIETHYLMONIUM CHLORIDE

70

Safety score · 0–100

Fine

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

About

A water-soluble quaternary ammonium conditioner with a short PEG-9 chain, used primarily in hair rinses and conditioning products.

PEG-9 diethylmonium chloride is a quaternary ammonium compound with a diethylamino group ethoxylated with approximately 9 moles of ethylene oxide. The PEG chain reduces the positive charge density, making it milder than non-ethoxylated quats while retaining conditioning benefits. EU cosmetics law does not specifically restrict this compound, but standard PEG impurity controls (1,4-dioxane) apply. It is primarily used in rinse-off hair care products.

Skin benefits

  • Provides effective hair conditioning
  • Improves wet combing and detangling
  • Leaves hair soft and manageable

Known concerns

  • Potential for 1,4-dioxane contamination from PEG-9 chain
  • Mild eye irritant at high concentrations

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.