This standard establishes specifications for film products with thermal shrinkage properties, primarily made from polystyrene resin through flat film extrusion and biaxial stretching processes. Its core content encompasses product classification, requirements, test methods, inspection rules, labeling, packaging, and more. The standard specifically stipulates the film's thickness, width, appearance, and various key performance indicators, with "thermal shrinkage rate" as the core performance, which must be determined according to specialized test methods. To evaluate these properties, the standard explicitly references multiple fundamental testing methods, involving key testing instruments such as a universal material testing machine (for determining mechanical properties like tensile strength), a gloss meter (for assessing surface gloss), and a thickness gauge. Furthermore, the standard clearly states that it does not apply to films intended for direct contact with food.