Polyimide film is a special plastic film, has excellent mechanical properties, dielectric properties, flame does not melt at -195 ℃ - 280 ℃ under the conditions of long-term use. Because of its unique high performance main as the base dielectrics for Flexible Printed Circuits (FPC), Tape Automated Bonding (TAB), Pressure Sensitive Tape (PST), Insulation for Electric Motor (Insulation) etc., it is widely used in sophisticated product of military affairs, satellite navigation, digital product, H grade and F grade electric motors, computer and mobile phone etc.