This standard pertains to the product technical specification for modified polyvinyl alcohol-coated biaxially oriented films—sections 1-4. It specifies the product classification, technical requirements (including dimensions, physical and mechanical properties, etc.), test methods, and inspection rules for such films—sections 1-6. The standard is applicable to films produced by coating modified polyvinyl alcohol onto biaxially oriented polypropylene (BOPP), polyester (BOPET), or polyamide (BOPA) substrates, primarily used as printing and composite base materials—sections 1-6. According to the test methods referenced in the standard, the core testing instruments involved include precision thickness gauges for measuring thickness deviation, film tensile testing machines for determining tensile properties, light transmittance haze meters for evaluating optical performance, as well as water vapor transmission rate testers and gas permeability testers for detecting barrier properties against water vapor or gases—sections 6-10.