Behentrimonium chloride, also known as docosyltrimethylammonium chloride or BTAC-228, is a yellow waxlike organic compound with chemical formula CH3(CH2)21N(Cl)(CH3)3, used as an antistatic agent and, sometimes, a disinfectant.

It is commonly found in cosmetics such as conditioners, hair dye, and mousse, and also in detergents.

Laboratory tests have indicated that it does readily biodegrade.

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