This standard specifies the terms and definitions, product classification, technical requirements, test methods, inspection rules, marking, Encasement, transportation and storage of polyvinyl butyral (PVB) film for building photovoltaic modules. It is applicable to PVB film used in building photovoltaic modules and photovoltaic modules used in ground power stations. Normative reference documents include determination of Tear strength of vulcanized rubber or thermally plasticity rubber, product geometry technical specifications, determination of density of plastic non-foam plastics, etc. In terms and definitions, polyvinyl butyral (PVB) film for building photovoltaic modules refers to the film whose main component is polyvinyl butyral, which is used for the encapsulation of building photovoltaic modules.