This is a fundamental and universal method standard for thermogravimetric analysis (TG) of polymeric materials. It specifies general methods for analyzing polymers using thermogravimetric techniques, applicable to liquids, powders, granules, and suitably sized molded products. The standard covers two core measurement modes: the dynamic mode, which measures mass changes as a function of temperature or time under programmed temperature control, and the isothermal mode, which measures mass changes over time at a constant temperature. Additionally, the standard clarifies that tests can be conducted in various atmospheres (e.g., inert gases) to separate processes such as thermal decomposition and oxidative degradation. According to the standard requirements, performing such analyses requires the use of a thermogravimetric analyzer (or thermobalance), which is capable of accurately measuring minute mass changes in samples under controlled temperature programs. The instrument typically needs to feature a controllable atmosphere system and precise temperature control capabilities. Through this method, the decomposition temperature and rate of polymers can be effectively determined, while simultaneously quantifying the content of volatiles, additives, or fillers present.