本文件规定了一种测定涂料、清漆和相关产品涂层水蒸气传输性能的方法。 它补充了ISO 12572。程序、定义和计算已尽可能从ISO 12572中接管。如有必要，可参考ISO 12572，以更好地理解本文件中规定的程序。 超过680 g/（m2？d）（即小于0.03 m的水蒸气扩散当量空气层厚度sd）的水蒸气透过率不能通过本文件中描述的试验方法准确量化。

This document specifies a method for determining the water-vapour transmission properties of coatings of paints, varnishes and related products. It supplements ISO 12572. As far as possible, the procedure, the definitions and the calculations have been taken over from ISO 12572. ISO 12572 can be consulted, if necessary, to obtain a better understanding of the procedure specified in this document. Water-vapour transmission rates of more than 680 g/(m2？d) (i.e. water-vapour diffusion-equivalent air layer thicknesses, sd, of less than 0,03 m) are not accurately quantified by the test method described in this document.