The NF P61-547-5-2016 standard specifies the technical requirements, test methods, conformity assessment, classification and designation of liquid waterproof films used for the bottom of tile Adhesive joints. The standard is suitable for scenes where waterproof treatment is required before tile paving, especially wet areas such as bathrooms and kitchens. By clarifying the performance indicators and testing procedures of waterproof films, it is ensured that they meet the needs of construction and long-term use. The standard also covers the classification and labeling of products, which helps to standardize market application, guide production and construction parties to select appropriate Water proofers, and provide protection for the durability and functionality of tile paving.