This specification covers coal-tar-saturated organic felt intended to be used with coal-tar pitches conforming to the appropriate requirements in the construction of built-up roofs and in the construction of waterproofing systems. In the process of manufacture, a single thickness of dry felt shall be saturated with refined coal-tar from which some of the more volatile constituents have been removed. The material shall conform to the physical requirements prescribed. Test methods shall be performed to determine the properties of the material.

1.1 This specification covers coal-tar-saturated organic felt that may be used with coal-tar pitches conforming to the appropriate requirements of Specification D 450 in the construction of built-up roofs and in the membrane system of waterproofing.

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.