Octadecyltrimethylammonium chloride OTAC, cas: 112-03-8, its English name: STAC； OTAC； Octadecyltrimethylammonium Chloride； Steartrimonium chloride； Stearyl trimethyl ammoium chloride； Trimethyloctadecylammonium chloride； Aliquat 7； It has good compatibility with cationic, non-ionic surfactants or dyes and remarkable synergistic effect. Good chemical stability, heat resistance, light resistance, strong acid and alkali resistance Has excellent permeability, softness, emulsification, anti-static and antibacterial properties. Octadecyltrimethylammonium chloride OTAC, cas: 112-03-8 is widely used in asphalt emulsification and waterproof coating emulsification, silicone oil emulsification, hair conditioner and cosmetic emulsification conditioning, fabric fiber softening and anti-static, organic bentonite modification, protein flocculation and water treatment flocculation in biopharmaceutical industry, glass fiber softening processing, nylon parachute surface anti burn treatment agent, oil paint cosmetic additive, hair conditioner, soft softener, as well as bactericides and disinfectants.