Caprolactam is a cyclic amide with the chemical formula C6H11NO. It is a colorless, viscous liquid that is primarily used as a monomer for the production of nylon-6, a synthetic polymer widely utilized in textiles, engineering plastics, and automotive components. First synthesized in the early 20th century, caprolactam is produced through the hydrogenation of cyclohexanone oxime. The material is known for its excellent strength, durability, and resistance to abrasion, making it an essential raw material in various industrial applications.