Didecyl dimethyl ammonium chloride

Basic Info:

  • Chemical Synonym(s): didecyl(dimethyl)azanium,chloride;
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  • CAS Number: 7173-51-5
  • Chemical Formula:


  • MSDS: Download


Melting point
88 °C
Storage temp.
Store below +30°C.
Appearance & Physical State
0.95 g/cm3 (20ºC)
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Didecyl dimethyl ammonium chloride, a colorless liquid with a characteristic odor. Didecyl dimethyl ammonium chloride is a quaternary ammonium compound.

Sometimes, it is called Didecylmethyldimethylammoniumchloride, DMDAC, R-40, and other names. Many of them have a strong effect on the mucous membrane of the respiratory tract and eyes.

Inhalation of this substance can cause severe irritation to respiratory organs that may lead to asphyxiation.

It is produced when propylene oxide reacts with hydrogen chloride gas in the presence of a dodecyl amine catalyst. Often used along with benzyl benzoate, it is found in personal hygiene products, such as shampoo.


Didecyl dimethyl ammonium chloride is a non-ionic surfactant widely used in various personal care products.

It is one of the most commonly produced chemicals in the world. It is a major component in many products such as shampoo, toothpaste, dish soap, and laundry detergent.

It is a mild surfactant whose primary function is to improve the viscosity and stability of aqueous formulations. It is used to preserve the foamability of cosmetics, as a solvent or dispersing agent, as a lower or higher foaming emulsifier, as a surfactant for cleansing and as an anti-static agent.

It is used as an antimicrobial agent in cosmetics, textiles and detergents. It is used as a sanitizer for hard surfaces and a preservative in personal care and cosmetic products.

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