Polyimide film, also called polyimide film, is a kind of thin-film insulating material. It is mainly made of pyromellitic dianhydride (PMDA) and diaminodiphenyl ether (DDE) in a strong polar solvent through polycondensation and casting to form a film and then imidization. Polyimide film generally appears yellow, but now it can be made into various colors, such as amber polyimide film, black polyimide film, red polyimide film, green polyimide film and transparent polyimide film.