Benzalkonium chloride is an organic salt classified as quaternary ammonium compound. It is used as cationic surfactant. Synonyms of benzalkonium chloride include alkyldimethylbenzylammonium chloride, BAC, BKC, and ADBAC. It is white or yellowish white powder, or a gelatinous substance that is soapy to touch. It is soluble in water and water.