GB/T 9345.2 - 2008 focuses on the determination of ash content of polyterephthalate plastics. This standard defines the applicable range of polyterephthalate plastics, specifies the collection and pretreatment steps of samples, and specifies the specific requirements of high temperature furnaces and other equipment. It precisely specifies the measurement operation process, including the control of heating temperature, burning time, and rigorous results calculation and reporting methods. The ash content of polyterephthalate has a significant impact on its performance and mass. This standard provides a unified and accurate measurement method for related industries, helps enterprises control the mass of products, and promotes the standardization process of testing in the plastics industry