ASTM D2178/D2178M-15a(2021)

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:D2178/D2178M −15a (Reapproved 2021)
Standard Specification for
Asphalt Glass Felt Used in Roofing and Waterproofing
This standard is issued under the fixed designation D2178/D2178M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope ing and Waterproofing
D1079 Terminology Relating to Roofing and Waterproofing
1.1 This specification covers glass felts impregnated to
D7654/D7654M Specification for Asphalt Used in Roofing
varying degrees with asphalt intended to be used with asphalts
Measured by Dynamic Shear Rheometer
conforming to the requirements of Specification D312/D312M
or D7654/D7654M in the construction of built-up roofs, and
3. Terminology
with asphalts conforming to the requirements of Specification
3.1 Definitions:
D449/D449M in the construction of waterproofing systems.
3.1.1 For definitions of terms used in this specification, refer
1.2 The values stated in either SI units or inch-pound units
to Terminology D1079.
are to be regarded separately as standard. The values stated in
3.2 Definitions of Terms Specific to This Standard:
each system may not be exact equivalents; therefore, each
3.2.1 net dry mass—the mass of the asphalt-impregnated
system shall be used independently of the other. Combining
glass felt exclusive of wrapping and packing material, after
values from the two systems may result in nonconformance
drying to constant weight and after removing all detached
with the standard.
comminuted surfacing material as described in 8.2.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Classification
responsibility of the user of this standard to establish appro-
4.1 Asphalt-impregnated glass felts Types IV and VI are
priate safety, health, and environmental practices and deter-
covered by this specification.
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
5. Materials and Manufacture
dance with internationally recognized principles on standard-
5.1 The felt shall be a thin, porous sheet of uniformly
ization established in the Decision on Principles for the
distributed glass fibers, with or without the addition of rein-
Development of International Standards, Guides and Recom-
forcing stranded glass yarns, and bonded with a water-resistant
mendations issued by the World Trade Organization Technical
resinous binder.
Barriers to Trade (TBT) Committee.
5.2 In the process of manufacture, the felt shall be impreg-
2. Referenced Documents
nated with asphalt which shall be permitted to contain a
mineral stabilizer so that the individual glass fibers are coated
2.1 ASTM Standards:
and the asphalt is evenly distributed throughout.
D146/D146M Test Methods for Sampling and Testing
Bitumen-Saturated Felts and Woven Fabrics for Roofing
5.3 The impregnated glass felt shall be surfaced with a
and Waterproofing
material to prevent sticking in the roll. The nature and quantity
D312/D312M Specification for Asphalt Used in Roofing
of the surfacing material shall not interfere with adhesion
D449/D449M Specification forAsphalt Used in Dampproof-
between the plies of a membrane.
6. Physical Properties, Dimensions, Masses, and
This specification is under the jurisdiction of ASTM Committee D08 on
Permissible Variations
Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.04
on Felts, Fabrics and Bituminous Sheet Materials.
6.1 The finished product shall conform to the physical
Current edition approved July 1, 2021. Published July 2021. Originally approved
properties, dimensions, masses, and permissible variations as
in 1963. Last previous edition approved in 2015 as D2178/D2178M – 15a. DOI:
prescribed in Tables 1 and 2.
10.1520/D2178_D2178M-15AR21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 The finished product shall not crack nor be so sticky as
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
to cause tearing or other damage upon being unrolled at
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. temperatures between 10 and 60 °C [50 and 140 °F].
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D2178/D2178M−15a (2021)
TABLE 1 Physical Properties of Asphalt Glass Felt
D146/D146M, except for the net dry mass of asphalt-
Type IV Type VI impregnated glass felt.
A
Breaking strength, min, kN/m [lbf ⁄in.]:
8.2 Net Dry Mass ofAsphalt-Impregnated Glass Felt—Cuta
Longitudinal (with the fiber grain) 7.7 [44] 10.5 [60]
representativesamplefromthefullwidthofeachsamplerollas
Transverse (across the fiber grain) 7.7 [44] 10.5 [60]
Pliability, 13-mm [ ⁄2-in.] radius bend no failures no failures
described in Section 10 of Test Methods D146/D146M. Sus-
A
To prevent the asphalt-impregnated glass felt from slipping from between the pend the samples vertically and allow them to dry to constant
jaws of the tension testing machine, insert a thin strip of soft gasket rubber
weight. Remove the detached comminuted surfacing as de-
between the felt and each of the four jaw faces of the machine.
scribed in Section 11 of Test Methods D146/D146M. Then
weigh each sample of felt and calculate the individual and
avera
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