GB/T 4207 - 2022 focuses on the performance detection of solid insulating materials, and specifies the determination method of the electric trace resistance index and the comparative electric trace index. It specifies the specifications and requirements of the test equipment, and details the sample preparation, test solution configuration and test operation process. By simulating the actual situation of the material in the electrical environment, the accurate determination of these two key indices provides a scientific basis for evaluating the anti-electric trace ability of solid insulating materials under the combined action of electric field and pollution, and helps to improve the material selection and safety performance of electrical equipment.