ISO 12572:2016规定了一种基于杯试验的方法，用于在等温条件下测定建筑产品的水蒸气渗透性和建筑材料的水蒸气渗透性。规定了不同的试验条件。 一般原则适用于所有吸湿和不吸湿的建筑材料和产品，包括隔热材料，以及带有饰面和整体外壳的材料和产品。附件给出了适用于不同材料类型的试验方法的详细信息。 通过该方法获得的结果适用于设计目的、生产控制和产品规范。

ISO 12572:2016 specifies a method based on cup tests for determining the water vapour permeance of building products and the water vapour permeability of building materials under isothermal conditions. Different sets of test conditions are specified. The general principles are applicable to all hygroscopic and non-hygroscopic building materials and products, including insulation materials and including those with facings and integral skins. Annexes give details of test methods suitable for different material types. The results obtained by this method are suitable for design purposes, production control and for inclusion in product specifications.