Polyimide film coated F46 composite film has excellent resistance to high and low temperature, laminated mica sheet, adhesion, radiation resistance, resistance to media, can be as low as -269 ℃ up to +400 ℃ temperature range use. Composite film also has the characteristics of high temperature self-adhesive seal. They can be used as high temperature flexible printed circuit substrate, flat circuit, wire and cable, wire insulation layer and used for a variety of motor insulation. Has been widely used in aircraft, spacecraft, nuclear industry, nuclear submarines, electric locomotives, audio devices, instrumentation, petrochemical and other departments.