ISO 12571:2013规定了确定多孔建筑材料和产品吸湿性能的两种替代方法: a）使用干燥器和称重杯（干燥器方法）; b）使用气候室（气候室法）。 干燥器方法是参考方法。 ISO 12571:2013没有规定采样方法。 ISO 12571:2013中规定的方法可用于确定样品在特定温度和湿度下与空气平衡的含水量

ISO 12571:2013 specifies two alternative methods for determining hygroscopic sorption properties of porous building materials and products: a) using desiccators and weighing cups (desiccator method); b) using a climatic chamber (climatic chamber method). The desiccator method is the reference method. ISO 12571:2013 does not specify the method for sampling. The methods specified in ISO 12571:2013 can be used to determine the moisture content of a sample in equilibrium with air at a specific temperature and humidity.