GB/T 21461.2-2008 Focuses on ultra-high molecular weight polyethylene (PE) (PE-UHMW) molding and extrusion materials in plastics. This part mainly specifies the preparation method of the sample, covering the sample acquisition process under different processes such as molding and extrusion. At the same time, it clarifies the main points of various performance measurement, including mechanical properties, thermal performance, etc. Through standardized sample preparation and accurate performance measurement, it provides a reliable basis for the mass evaluation of PE-UHMW materials, helps related Product Research & Development, production and mass control, and promotes the rational application of this type of plastic materials in various industries.