Stearoxytrimethylsilane is classified as emollient and skin conditioning agent. It is used in a number of cosmetics formulations. It is derived from stearic acid, a fatty acid obtained from animal fat or plants. When derived from animals, it comes from cows, pigs, sheep, and according to Peta, from dogs and cats euthanized in shelters. Stearic acid is used in cosmetics and lubricants. DOWSIL™ 580 Wax (Stearoxytrimethylsilane (and) Stearyl Alcohol) is a soft, solid mixture of stearyl alcohol and stearoxy trimethylsilane. The cosmetic properties of the wax are a result of the silicone moiety. The inclusion of the stearoxy group involves compatibility with organic ingredients. Hair care and skin care products benefit from the property of this wax to facilitate the formation of a very thin film which is neither oily, tacky or too dry.