Provides requirements for properties of flexible copper clad polyimide film, of defined flammability and optional requirements which apply only by agreement between purchaser and supplier. Copper clad film complying with all the requirements not marked 'optional' should be deemed to comply with this specification. Includes internal marking, electrical properties, non-electrical properties of the copper clad film non-electrical properties of the base material after complete removal of the copper foil, packaging and marking, acceptance testing and additional requirements.