GB/T 4 2919.6 - 2023 is the thermal conductivity testing standard for plastics. Focusing on the comparative method based on temperature modulation technology, it is used to determine the thermal conductivity and thermal diffusion coefficient of plastics. The standard specifies the scope of plastics, explains the technical principles, and specifies the instrumentation and equipment, sample prepative, test process, data processing and other links. With this standard, the thermal performance data of plastics can be accurately obtained, providing a key basis for the selection and application of plastics in temperature control fields such as electronics and construction, and helping related industries optimize product design and improve product thermal management efficiency.