1.1 本试验方法涵盖了测量压敏胶带水蒸气透过率的一个程序。 1.2 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统必须独立使用，不得以任何方式组合值。 1.3 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、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 该测试方法的结果将表明胶带通过其最小尺寸（通常垂直于胶带背衬）的水蒸汽相对渗透率。 5.1.1 与胶带厚度相比，平行于胶杯界面的水蒸汽路径很大，后者通常是传输蒸汽的唯一来源。 5.1.2 某些类型的胶带允许在垂直于背衬的方向上或沿着平行于胶杯界面的背衬路径形成相对自由的路径，从而使粘合剂成为主要屏障。 5.2 如果粘合剂在暴露期间没有继续粘附在杯法兰上，从而导致意外的水蒸气通道，则应认为未进行测量。 因此，胶带可能被视为不适合在接近试验的湿度条件下在杯形法兰等表面上使用。 注1: 可能的兴趣只是将胶带材料作为水蒸汽屏障。在这种情况下，胶带与杯形法兰的粘附程度可能无关紧要，因此应采取措施防止任何边缘效应。这些在第节中提到 10 .

1.1 This test method covers one procedure for measuring the water vapor transmission rate of pressure-sensitive tape. 1.2 The values stated in either SI or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system must be used independently, without combining values in any way. 1.3 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. 1.4 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 results of this test method will indicate the relative permeability by water vapor of the tape through its smallest dimension (generally normal to the tape's backing). 5.1.1 The pathway for the water vapor parallel to the adhesive-cup interface is great compared to the tape's thickness and the latter is usually the nearly exclusive source of transmitted vapor. 5.1.2 Some tape types allow a relatively free path in a direction normal to the backing or along backing pathways parallel to the adhesive-cup interface allowing the adhesive to become the principal barrier. 5.2 If the adhesive does not continue to adhere to the cup flange during the exposure periods allowing unintended pathways for water vapor to occur, the measurement should be considered as not having been made. Consequently, the tape might be considered as being inappropriate for use on surfaces like the cup flange under moisture conditions approximating those of the test. Note 1: It may be that the interest is simply in the tape material as a water vapor barrier. In this case, how well the tape adheres to the cup flange may be of little consequence, and steps to prevent any edge effects are in order. These are referred to in Section 10 .