This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of biaxially oriented nylon (BOPA)/low density polyethylene (LDPE) composite films and bags (hereinafter referred to as films and bags) . This standard applies to composite films and bags made from biaxially stretched nylon film and low-density polyethylene resin or film through extrusion compounding or dry compounding. The products are mainly used for evacuation, ventilation, freezing, low-temperature sterilization packaging and general packaging films and bags.