GB/T 13477.20-2002 for the determination of Pollution properties of building sealing materials. This standard specifies the specific measurement process and specifies the required test materials, such as adjacent substrates of specific materials. The sealing material and the substrate are placed in combination as required. After a certain period of time and environmental conditions, the pollution of the sealing material to the substrate is observed, including whether bleeding, stains and other phenomena occur. This measurement method provides a basis for evaluating the impact of building sealing materials on surrounding materials in actual use, which helps to ensure the appearance of the building. Appearance is clean and tidy, ensure the compatibility of the sealing material with the surrounding environment, and improve the overall mass of the building.