Kydex is a type of thermoplastic that is used for all kinds of purposes. Since being made by its trademark owner Kydex LLC, this material has found its way in a variety of items ranging from cargo lining and safety helmets to exhaust systems and equipment housings. This is made possible by its unique structure. Kydex material is a combination of acrylic and polyvinyl chloride. This combination is responsible for most of the intrinsic properties of this material.