1.1 This specification covers glass felt impregnated with coal tar to be used with coal tar pitch conforming to the appropriate requirements of Specification D 450 in construction of built-up roofs and in the construction 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 The following safety hazards caveat pertains only to the test methods portion, Section 8, of this specification: 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.