ASTM D4990-97a(2020)

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.
Designation:D4990 −97a (Reapproved 2020)
Standard Specification for
Coal-Tar Glass Felt Used in Roofing and Waterproofing
This standard is issued under the fixed designation D4990; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
3.1 Definitions—For definitions of terms used in this
1.1 This specification covers glass felt impregnated with
specification, refer to Terminology D1079.
coal-tar intended to be used with coal-tar pitch conforming to
the appropriate requirements of Specification D450/D450M in
3.2 Definitions of Terms Specific to This Standard:
construction of built-up roofs and in the construction of
3.2.1 net dry mass—the mass of the coal-tar-impregnated
waterproofing systems. glass felt exclusive of wrapping and packing material, after
drying to constant weight and after removing all detached
1.2 The values stated in SI units are to be regarded as the
comminuted surfacing material as described in 8.2.
standard. The values given in parentheses are for information
only.
4. Classification
1.3 The following safety hazards caveat pertains only to the
4.1 Coal-tar-impregnated glass felt covered by this specifi-
Test Methods portion, Section 8, of this specification: This
cation is of one type.
standard does not purport to address all of the safety concerns,
if any, associated with its use. It is the responsibility of the user
5. Materials and Manufacture
of this standard to establish appropriate safety, health, and
5.1 The felt shall be a thin, porous sheet of uniformly
environmental practices and determine the applicability of
distributed glass fibers, with or without the addition of rein-
regulatory limitations prior to use.
forcing stranded glass yarns, and bonded with a water-resistant
1.4 This international standard was developed in accor-
resinous binder.
dance with internationally recognized principles on standard-
5.2 In the process of manufacture, the felt shall be impreg-
ization established in the Decision on Principles for the
nated with coal-tar which shall be permitted to contain a
Development of International Standards, Guides and Recom-
mineral stabilizer so that the individual glass fibers are coated
mendations issued by the World Trade Organization Technical
and the coal-tar is evenly distributed throughout.
Barriers to Trade (TBT) Committee.
5.3 The impregnated glass felt shall be surfaced lightly with
a suitable finely comminuted material to prevent sticking in the
2. Referenced Documents
roll. The nature and quantity of the surfacing material shall not
2.1 ASTM Standards:
interfere with adhesion between the plies of a membrane.
D146/D146M Test Methods for Sampling and Testing
Bitumen-Saturated Felts and Woven Fabrics for Roofing
6. Physical Properties, Dimensions, and Masses
and Waterproofing
6.1 The material shall conform to the physical properties,
D450/D450M Specification for Coal-Tar Pitch Used in
dimensions, and masses prescribed in Tables 1 and 2.
Roofing, Dampproofing, and Waterproofing
6.2 The finished product shall not crack nor be so sticky as
D1079 Terminology Relating to Roofing and Waterproofing
to cause tearing or other damage upon being unrolled at
temperatures between 10 and 60 °C (50 and 140 °F).
6.3 After extraction of the coal-tar in accordance with
This specification is under the jurisdiction of ASTM Committee D08 on
Section 16 of Test Methods D146/D146M, the desaturated felt
Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.04
on Felts, Fabrics and Bituminous Sheet Materials.
shall remain flat and unbuckled, shall retain its original shape
Current edition approved May 1, 2020. Published May 2020. Originally
and dimensions, and individual fibers shall remain firmly set in
approved in 1989. Last previous edition approved in 2013 as D4990 – 97a (2013).
place.
DOI: 10.1520/D4990-97AR20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.4 The pliability specimen shall be conditioned in air at 25
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6 1 °C (77 6 2 °F) for at least 1 h and tested in a room
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. maintained at the same temperature (immersion in water not
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D4990−97a (2020)
TABLE 1 Physical Properties of Coal-Tar Glass Felt
8.2 Net Dry Mass of Coal-Tar-Coated Glass Felts—Cut a
A
Breaking Strength, min, kN/M (lbf/in.) Type 1 representativesamplefromthefullwidthofeachsamplerollas
Longitudinal (with the fiber grain) 7.7 (44) described in Section 10 of Test Metho
...