1.1 本试验方法包括测定500至100范围内的水蒸气透过率的程序 000 g/（m 2. ·天）通过非织造和塑料屏障材料。该方法适用于薄膜、由单层或多层合成或天然聚合物组成的屏障、非织造织物和涂有3层以下薄膜的非织造织物 毫米（0.1 英寸）的厚度。该方法是定量的，并已通过随附的 表1 7586中有效测量材料水蒸气透过率的精度和偏差分析总结 g/（m 2. ·天）至51 996 g/（m 2. 白天 1.2 本试验方法用于测定( 1. )水蒸气透过率（WVTR），以及( 2. )对水蒸气的渗透性。 1.3 以国际单位制表示的数值应视为标准。SI单位后括号中给出的值仅供参考，不被视为标准值。WVTR的可接受单位通常为g/（m 2. 白天 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 本试验方法的目的是获得阻隔材料的WVTR值。 5.2 WVTR是材料的一个重要性质，可以与保质期有关；产品稳定性、呼吸能力和穿着舒适性。 5.3 如果买方和卖方已就取样程序、试验条件和验收标准达成一致，则该试验方法的数据适合作为试验的参考方法。

1.1 This test method covers a procedure for determining the rate of water vapor transmission ranging between 500 to 100 000 g/(m 2 ·day) through nonwoven and plastic barrier materials. The method is applicable to films, barriers consisting of single or multilayer synthetic or natural polymers, nonwoven fabric, and nonwoven fabrics coated with films up to 3 mm (0.1 in.) in thickness. This method is quantitative and has been demonstrated by the enclosed Table 1 Summary of Precision and Bias Analysis to be effective for measuring the water vapor transmission rate of materials from 7586 g/(m 2 ·day) to 51 996 g/(m 2 ·day). 1.2 This test method provides for the determination of ( 1 ) water vapor transmission rate (WVTR), and ( 2 ) the permeance to water vapor. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. The acceptable units for WVTR are usually g/(m 2 ·day). 1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The purpose of this test method is to obtain values for the WVTR of barrier materials. 5.2 WVTR is an important property of materials and can be related to shelf life; product stability, breath-ability, and wearing comfort. 5.3 Data from this test method is suitable as a referee method of testing, provided that the purchaser and seller have agreed on sampling procedures, test conditions, and acceptance criteria.