Cetrimonium bromide is an ammonium salt used in hair and skincare products.
It prevents static build-up that causes flyaway hair.
Cetrimonium bromide acts as a preservative.
It is also an emulsifier and a surface-active agent (surfactant).
All surfactants are partly water-soluble and partly oil-soluble. It is this quality that allows oil and water to mix.
When used at above minimum concentration, the surfactant molecules become organized in a structure that can trap oil-based dirt. This allows the oil and dirt trapped in it to be rinsed away cleaning the hair.
We use cetrimonium bromide in our American Cream, Retread, Jungle, Veganese and Coolaulin hair conditioners; it allows the hair to lie flat and gives it a silky shine.