GB/T 13477.11-2002 For building sealing materials, the method for determining the adhesion of fixed extension after immersion in water is specified. The standard specifies the required equipment, such as stretching devices, etc. Detailed description of the specimen preparation, the sealing material is made into a specific shape and bonded to the substrate. The specimen is first immersed in water to simulate a humid environment, and then stretched to a certain elongation at a specified temperature and maintained. By observing the bonding status of the sealing material and the substrate after immersion in water, including whether it is debonded or cracked, the bonding performance under humid and tensile conditions is evaluated, which provides a key mass detection basis for the application of building sealing materials under humid conditions.