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Polyimide film is a thin and light base film material, which has a good application in the field of aerospace and other outer space. The ultra-thin and ultra-light characteristics make it an irreplaceable role in protecting the spacecraft's normal operation. The polyimide film is used as the main insulation of the cable used in the wiring harness connecting the different key components of the rocket to ensure its functionality. The film's high temperature resistance, weight and space savings make it a very important feature in aerospace applications.