Crystal Flex Clear Lexan Resin 30 GaugeCrystal Flex (LEXAN) is made of 100% Polycarbonate and comes uncoated with a clear protective glazing. Due to the LEXAN resin, Crystal Flex may be used in areas that are exposed to high temperatures, including 140-160 degree water temperature. Crystal Flex is easily cleaned with mild soap and water and is an excellent choice for marine enclosures and automobiles.