1.1 本试验方法测定了刚性隔热材料的扁平试样在浸没和暴露于干燥条件下后保留的水量（不包括地表水）。本试验方法旨在用于实验室材料的表征。其目的不是模拟建筑施工应用中可能遇到的任何特定环境条件。 1.2 本试验方法并未解决刚性隔热材料的所有可能吸水和保水机制以及相关现象。它仅与中概述的条件有关 1.1 . 测定因部分浸入、水蒸气传输、内部冷凝、冻结而在隔热材料中积聚的水分- 解冻循环或这些影响的组合需要不同的测试程序。 1.3 本试验方法不涉及或试图量化材料的排水特性。 1.4 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不一定是精确的等价物；因此，每个系统应相互独立使用。将两个系统的值结合起来可能会导致不符合标准。 1.5 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。 1.6 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 本试验方法提供了一种测量刚性隔热平面试样因浸入水中和暴露在干燥条件下而保持水分的方法。

1.1 This test method determines the amount of water retained (excluding surface water) by flat specimens of rigid thermal insulations after immersion and exposure to drying conditions. This test method is intended to be used for the characterization of materials in the laboratory. It is not intended to simulate any particular environmental condition potentially encountered in building construction applications. 1.2 This test method does not address all the possible mechanisms of water intake and retention and related phenomena for rigid thermal insulations. It relates only to those conditions outlined in 1.1 . Determination of moisture accumulation in thermal insulations due to partial immersion, water vapor transmission, internal condensation, freeze-thaw cycling, or a combination of these effects requires different test procedures. 1.3 This test method does not address or attempt to quantify the drainage characteristics of materials. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems has the potential to result in non-conformance with the standard. 1.5 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. 1.6 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 This test method provides a means of measuring the water retention of flat specimens of rigid thermal insulation as a result of immersion in water and exposure to drying conditions.