The polyurethane waterproofing coating for a subway project must be compatible with the alkaline concrete environment. The testing institution has conducted a special chemical corrosion resistance test. After immersing the samples in a specific concentration of sodium hydroxide solution for a specified duration, the tensile strength loss rate meets the standard, and the impermeability maintains no leakage under constant pressure. With its comprehensive service capabilities, the company has simultaneously completed tests on multiple indicators such as heat resistance and drying time, issuing a CMA report quickly to ensure the long-term waterproof life of the underground engineering.