Copter™Screenprotector Copter™Screenprotector consists of an extremely durable material originally developed for military use. The material is an offshoot of a urethane film that was developed by the U.S. Army during the Gulf War to protect helicopter rotor blades from the abrasive desert sand. The film is transparent and has a lifetime guarantee against yellowing or cracking due to UV exposure. It withstands freezing temperatures; high heat, oils and gasoline, and wear and tear caused by rocks and other abrasive elements. Substrate thickness: 0.178 mm Adhesion to steel: 0.438 N/mm Tensile strength: 10.508 N/mm Elongation: 500% Operating temperature: -51°C to 149°C Application temperature: 10°C to 49°C