Dicetyldimethylammonium chloride

Dicetyldimethylammonium chloride (CAS 1812-53-9), also known as Dicetyldimonium chloride and Quaternium-31, is a dialkyl quaternary ammonium compound used as a cationic surfactant and biocide. Its dual long-chain structure delivers strong surface adsorption, making it effective for conditioning, antimicrobial action, and emulsion stabilization across personal care and industrial applications.

In hair care formulations, it functions as a primary conditioning agent in rinse-off conditioners and treatment masks, depositing onto negatively charged hair fiber to improve detangling and softness. Textile and leather processors use it as a fabric softener and antistatic agent applied during finishing stages. In water treatment, it acts as a biocide targeting bacteria and algae.

Paper manufacturers apply it as a wet-strength additive and surface sizing agent to improve sheet performance. It is also utilized in hard surface disinfectants for institutional cleaning. Dicetyldimethylammonium chloride is supplied as a paste, flake, or aqueous dispersion. Standard grades include cosmetic-grade and technical-grade material for various processing requirements.

Cosmetic-grade product meets purity specifications suitable for leave-on and rinse-off personal care formulations. Typical active concentrations in commercial supply range from 70% to 90% active content.