Behentrimonium Methosulfate (and) Cetyl Alcohol (and) Butylene Glycol

BTMS-50 is a pre-blended conditioning emulsifier system combining behentrimonium methosulfate (a mild cationic quaternary ammonium compound derived from rapeseed/canola oil), cetyl alcohol (a fatty alcohol emollient and co-emulsifier), and butylene glycol (a humectant and solvent). It is the industry-standard self-emulsifying base for conditioning hair care products, particularly leave-in and rinse-out conditioners, because its cationic charge causes it to substantively deposit onto negatively charged, damaged hair, providing detangling, slip, and frizz control. Formulators favor BTMS-50 over older quaternary ammonium compounds like BTAB because it is significantly milder, produces stable oil-in-water emulsions without additional emulsifiers, and delivers a lightweight, non-greasy skin and hair feel.