1.1 本规范涵盖不同程度浸有沥青的玻璃毡，拟与符合规范D 312要求的沥青一起用于组合式屋顶施工，与符合规范D 449要求的沥青一起用于防水系统施工。1.2 以英寸-磅单位表示的数值应视为标准。括号中给出的值仅供参考。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）。本标准的使用者有责任在使用前建立适当的安全和健康实践，并确定监管限制的适用性。

1.1 This specification covers glass felts impregnated to varying degrees with asphalt intended to be used with asphalts conforming to the requirements of Specification D 312 in the construction of built-up roofs, and with asphalts conforming to the requirements of Specification D 449 in the construction of waterproofing systems.1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.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 and health practices and determine the applicability of regulatory limitations prior to use.