Cetrimonium chloride, or cetyltrimethylammonium chloride (CTAC), is a topical antiseptic and surfactant. It is commonly used in hair conditioners and shampoos, as a conditioning agent. Also used in adhesives and sealants, coating products, fillers, putties, plasters, modelling clay, washing & cleaning products, polishes and waxes and cosmetics and personal care products.