GB/T 9345.4 - 2008 is dedicated to the determination of polyamide ash in plastics. It clearly defines the scope of application, elaborates on the sample preparation process, specifies the specifications of high temperature furnaces and other instruments and equipment, and standardizes the operation process of determining polyamide ash, including heating temperature, duration control, and method of calculating and reporting results. Polyamide ash content affects plastic performance and mass. This standard provides a unified method for accurately determining polyamide ash content in plastic production, testing and related application industries, helping to control product mass and promote the development of testing standardization in the plastics industry.