This standard specifies the terms and definitions, basic requirements, technical requirements, test methods, inspection rules, marking, packaging, storage, transportation and quality commitments for double-sided fluorine film insulating backsheets for crystalline silicon solar cell modules. This standard applies to insulating backsheets for crystalline silicon solar cell modules (hereinafter referred to as "backsheets") using polyester film as the base material and a double-sided composite fluorine film (polyvinylidene fluoride film, etc.).