ISO 12571 "Determination of moisture absorption performance of building materials and products" specifies the method for measuring the moisture absorption performance of building materials and products. This standard is suitable for evaluating the moisture absorption behavior of building materials in heat and humidity environments, helping to understand the moisture adsorption characteristics of materials under humid conditions. The test determines the moisture absorption capacity of materials by measuring the amount of moisture absorbed by materials under different relative humidity. The standard is applicable to a variety of building materials, such as walls, floors, ceilings, etc., and is especially important in environments where moisture has a greater impact. The results of the moisture absorption performance test can provide data support for building design, material selection and performance evaluation in heat and humidity environments, ensuring the durability and comfort of the building.