The ASTM D1331-20 standard specifies a standard test method for the determination of surface tension and interfacial tension of Coatings, solvents, surfactant solutions and related materials. This method is suitable for evaluating the tension characteristics between the liquid surface and the liquid. These properties are important for the wettability of Coatings, coating performance and adhesion on different surfaces. Through this test, researchers and engineers can be helped to optimize the formulation, improve the performance of Coatings and related materials, and ensure their effectiveness and Reliability in practical applications. This standard has important guiding significance for the research and development and quality control of surfactants, Coatings and solvents.