Stearic acid called Octadecanoic Acid. Stearic acid is found in animal and plant fats and is component of cocoa butter and shea butter. Stearic acid is mixture of equal amounts of stearic and palmitic acids and small amounts of oleic acid. In nature stearic acid found as mixed triglyceride or fat with long-chain acids and as an ester of fatty alcohol. It is abundant in animal fat and vegetable fat, lard and tallow often contain up to 30 percent stearic acid.