1.1本试验方法涵盖了测定水蒸气通过柔性阻隔材料的透过率的程序。该方法适用于3 mm（0.1 in.）以下的薄板和薄膜在厚度上，由单层或多层合成或天然聚合物和箔组成，包括涂层材料。它规定了( 1. )水蒸气透过率（WVTR）( 2. )薄膜对水蒸汽的渗透性，以及( 3. )对于均质材料，水蒸气渗透系数。注1必须小心使用水蒸气渗透性和水蒸气渗透性的值。 WVTR与厚度的反比关系和WVTR与水汽分压差的直接关系可能并不总是适用。 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This test method covers a procedure for determining the rate of water vapor transmission through flexible barrier materials. The method is applicable to sheets and films up to 3 mm (0.1 in.) in thickness, consisting of single or multilayer synthetic or natural polymers and foils, including coated materials. It provides for the determination of ( 1 ) water vapor transmission rate (WVTR), ( 2 ) the permeance of the film to water vapor, and ( 3 ) for homogeneous materials, water vapor permeability coefficient. Note 1Values for water vapor permeance and water vapor permeability must be used with caution. The inverse relationship of WVTR to thickness and the direct relationship of WVTR to the partial pressure differential of water vapor may not always apply. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.