This is a method standard for determining the specific heat capacity of plastics using differential scanning calorimetry. It specifies the core methodology for accurately obtaining thermal performance parameters of plastic materials through thermal analysis techniques. The key to this standard lies in conducting experiments using specific DSC instruments, typically involving three consecutive measurements: blank, reference material (such as sapphire), and sample. Reliable specific heat capacity data are obtained through comparative analysis. This method provides a standardized technical approach for evaluating the ability of plastics to store or transfer thermal energy at specific temperatures, serving as an important basis for material research and industrial quality control.