Magentran Sputtering film is made by pure gold, silver and other 24 kinds of rare metal. And then use a magnetic field to evenly sputter metalions onto an optical-grade PET substrate and deposit them into a metal coating layer to play the role of continuous heat insulation. The product features a high-definition view, strong infrared blocking, effective UV protection, low internal reflection, non-oxidizing, non-fading, and no signal interference. Working temperature: -40°~ 120°