GB/T 13477.9-2002 belongs to the test method standard for building sealing materials. This part focuses on the measurement of tensile adhesion after immersion in water, and specifies the specific process for testing the bonding performance of building sealing materials under immersion conditions. The test preparation, such as specimen preparation, immersion condition setting, and tensile test operation steps, are described in detail. By measuring the change of tensile bonding performance of sealing materials before and after immersion in water, the water-resistant bonding ability is evaluated, which provides a key mass detection basis for the application of building sealing materials in humid environments and guarantees the sealing effect and waterproof performance of buildings.