GB/T 2546.2 - 2022 Specimen preparation and performance measurement of focused polypropylene (PP) (PP) molding and extrusion materials. In the sample preparation, the PP raw material processing, injection molding and extrusion molding parameters are specified in detail to ensure that the sample mass is uniform and representative. In terms of performance measurement, it covers mechanical properties such as stretching, Impact, bending, and physical properties such as melt flow rate and density. It clarifies various test methods, equipment requirements and operation procedures, can accurately obtain PP material performance data, provide key basis for PP material quality control, Product Research & Development and application, and promote the standardization development of related industries.