GB/T 3392-2025 "Flexible graphite plate, test method" is a national standard, which is applicable to the performance testing and quality control of flexible graphite plates. The standard specifies the test methods for the physical performance, Mechanical Properties and chemical performance of flexible graphite plates, including key indicators such as density, tensile strength, compression rate, rebound rate, thermal conductivity, ash content, etc. The standard describes the sample preparation, test equipment, test procedures and data processing requirements in detail to ensure the accuracy and comparability of test results. Compared with the old version, new test items such as high temperature Stability and oxidation resistance have been added, and some test procedures have been optimized to improve test efficiency.