Benzalkonium chloride, also known as BZK, BKC, BAC, alkyldimethylbenzylammonium chloride and ADBAC, is a class of cationic surfactants. They are organic salts, called quaternary ammonium compounds. It has three main categories of use: as a biocide, a cationic surfactant, and phase transfer agent.[2] ADBACs are a mixture of alkylbenzyldimethylammonium chlorides, where the alkyl group has various even-numbered alkyl chain lengths