GB/T 13477.19-2002 is part of the test method for building sealing materials, focusing on the determination of mass and volume changes. The standard details the test process and specifies the required equipment, such as high-precision Balance, measuring tools for volume measurement, etc. For sealing material specimens under specified conditions, such as before and after different temperatures, Humidity environment or specific chemical media, the mass and volume are accurately measured. By comparing the data, the mass and volume change rates are calculated to evaluate the sealing material Stability. This provides a key test basis for the long-term performance of building sealing materials in complex environments and ensures the durability of sealing projects.