The GB/T 21460.2 - 2008 standard is for styrene-acrylonitrile (SAN) molding and extrusion materials in plastics. It focuses on standardizing the sample preparation process of the material and specifies how to obtain samples that meet the testing requirements. At the same time, it specifies the measurement methods of relevant performance, covering a variety of key performance indicators. This standard provides an important basis for the production, mass testing and application evaluation of SAN materials, helping to ensure the mass and performance of materials, and promoting the development of related industries.