This standard is used to evaluate the leaching ability of latex paint films when they come into contact with water after application. The test focuses on analyzing the leaching of surfactants and Miscellaneous water-soluble materials from the paint film, which is essential to understand the performance of Coatings in humid environments. The standard helps identify possible contamination problems of Coatings, providing users with effective preventive measures to ensure stable and long-lasting performance of Coatings in practical applications.