1.1 本规范涵盖了拟与符合规范的沥青一起使用的沥青或煤沥青饱和的机织棉布 D312/D312M 或 D449/D449M ，符合规范的煤沥青 D450/D450米 ，或在屋面和防水系统的施工中使用适当的含溶剂沥青材料。 1.1.1 沥青饱和棉布应与沥青基层水泥混合使用；典型的是符合规范的拖地沥青 D312/D312M 或 D449/D449M 或适当的含溶剂的沥青化合物。 1.1.2 煤焦油饱和棉布应与煤一起使用- 焦油基胶合板；一种典型的沥青是符合规范的煤沥青 D450/D450米 或适当的含溶剂的煤焦油化合物。 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。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值结合起来可能会导致不符合标准。 1.3 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。

1.1 This specification covers woven cotton fabrics saturated with either asphalt or coal-tar pitch intended to be used with asphalts conforming to Specification D312/D312M or D449/D449M , coal-tar pitches conforming to Specification D450/D450M , or appropriate solvent bearing bituminous materials in the construction of roofing and waterproofing systems. 1.1.1 Asphalt-saturated cotton fabric shall be used with asphalt base plying cement; typical ones are mopping asphalts conforming to Specification D312/D312M or D449/D449M or appropriate solvent bearing asphaltic compounds. 1.1.2 Coal-tar-saturated cotton fabric shall be used with coal-tar based plying cements; a typical one is coal-tar pitch conforming to Specification D450/D450M or appropriate solvent bearing coal-tar compounds. 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 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.