1.1 本试验方法涵盖了由沥青浸渍毡和增强聚合物改性沥青片材组成的屋面低温展开引起的表面开裂的物理试验和分析程序。这些产品可以在一侧使用各种表面材料。 1.2 以国际单位制或英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完全相等；因此，每个系统应独立使用。 将两个系统的值合并可能导致不符合标准。 1.3 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建立适当的安全、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 由于毛毡或片材屋面或防水材料被卷起并展开，因此该测试方法模拟了展开过程中毛毡或薄膜在实际现场条件下的行为。 5.2 本试验方法旨在帮助那些对屋面和防水毡和板材的物理性能感兴趣的人。 5.3 这种测试方法使研究人员能够在实验室条件下测量屋面和防水毡或片材的低温展开的相对行为。 5.4 从该试验方法获得的数据不允许预测使用寿命或材料在试验温度下安装的能力。在应用过程中，展开能力很重要，并且据信展开时的温度会影响屋顶和防水膜的性能。然而，测试数据和性能之间的实际联系未知，取决于材料和暴露。

1.1 This test method covers the procedure for the physical testing and analysis of surface cracking due to low-temperature unrolling of roofing composed of bituminous impregnated felts and reinforced polymer-modified bituminous sheet materials. These products may employ various surfacing materials on one side. 1.2 The values stated in either SI units 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 shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. 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 Since felts or sheet roofing or waterproofing materials are brought to the roof in a roll and unrolled, this test method simulates felt or membrane behavior under actual field conditions during the unrolling process. 5.2 This test method is designed to aid those interested in the physical properties of roofing and waterproofing felts and sheet materials. 5.3 This test method enables a researcher to measure the relative behavior of low-temperature unrolling of roofing and waterproofing felt or sheet materials under laboratory conditions. 5.4 The data obtained from this test method will not permit service life prediction or the ability of the material to be installed at the tested temperature. Unrolling capabilities are important during application, and the temperature at the time of unrolling is believed to affect the performance of roofing and waterproofing membranes. However, the actual link between the test data and performance is unknown and is dependent on the materials and exposure.