GB/T 13465.5-2009 formulates a test method for the cissing rate of impermeable graphite phenolic adhesives. This standard specifies the preparation process of the sample to ensure that its specifications and materials meet the test requirements. Specify the equipment required for the test, and specify the accuracy of the measurement tools. In the test operation, standardize the curing conditions, including key factors such as temperature and time, as well as the Measurement mode of the cissing rate. Through this standard, the cissing condition of the adhesive during the curing process can be accurately determined. This is of great significance to the industries that use the adhesive, such as chemical equipment manufacturing, etc., and helps to optimize the process, ensure product mass, and reduce defects caused by cissing.