... is an important chemical raw material and additive, widely used in rubber, plastics, cosmetics, pharmaceuticals, chemical auxiliary agent industries ... 16COOH. Its name comes from the Greek word, stear, which means tallow. Its IUPAC name is octadecanoic acid.Stearic acid ... and C18, white flake solid at ambient temperature, not dissolved in water, slightly dissolved in benzene and carbon bisulfide, and ...