ASTM D1670/D1670M-11(2023)

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: D1670/D1670M − 11 (Reapproved 2023)
Standard Test Method for
Failure End Point in Accelerated and Outdoor Weathering of
Bituminous Materials
This standard is issued under the fixed designation D1670/D1670M; 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 D4799/D4799M Practice for Accelerated Weathering Test
Conditions and Procedures for Bituminous Materials
1.1 This test method covers the use of a spark-generating
(Fluorescent UV, Water Spray, and Condensation Method)
apparatus for determination of failure due to cracking of
bituminous materials undergoing accelerated or outdoor weath-
3. Summary of Test Method
ering on electrically conductive backings.
3.1 Dry, weathered, bituminous-coated test panels are
1.2 The values stated in either SI units or inch-pound units
grounded and a feeler electrode is passed over the back of a
are to be regarded separately as standard. The values stated in
linagraphic or ultra high sensitivity thermal fax paper placed on
each system may not be exact equivalents; therefore, each
the bituminous surface with the emulsion side down. Photo-
system shall be used independently of the other. Combining
copies are made of the front side of the paper on which the
values from the two systems may result in nonconformance
spots caused by the sparks appear. The photographs are
with the standard.
covered with an acrylic grid and the number of squares
1.3 This standard does not purport to address all of the
containing the spark records are counted and reported. Spark-
safety concerns, if any, associated with its use. It is the
ing in 26 or more grid squares is representative of failure.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
4. Significance and Use
mine the applicability of regulatory limitations prior to use.
4.1 The extent of cracking or pitting of bituminous films is
1.4 This international standard was developed in accor-
a measure of the extent of deterioration due to weathering.
dance with internationally recognized principles on standard-
Failure due to cracking is more accurately determined electri-
ization established in the Decision on Principles for the
cally than visually.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4.2 Failure determined by this test method will depend not
Barriers to Trade (TBT) Committee.
only on the characteristics of the bituminous material and the
extent of weathering, but also on the film thickness, and the
2. Referenced Documents
amount and type of mineral filler present.
2.1 ASTM Standards:
4.3 Tests on a similar material of known weathering char-
D1435 Practice for Outdoor Weathering of Plastics
acteristics (a control) exposed at the same time as the test
D1669/D1669M Practice for Preparation of Test Panels for
material is strongly recommended as a check on the validity of
Accelerated and Outdoor Weathering of Bituminous Coat-
the test results.
ings
D4798/D4798M Practice for Accelerated Weathering Test
5. Apparatus
Conditions and Procedures for Bituminous Materials
5.1 Any Spark-Generating Apparatus —Fig. 1 is an ex-
(Xenon-Arc Method)
ample of an acceptable configuration for the test feeler. Other
configurations are not prohibited, subject to the following
conditions:
This test method is under the jurisdiction of ASTM Committee D08 on Roofing
and Waterproofing and is the direct responsibility of Subcommittee D08.02 on Steep
Roofing Products and Assemblies.
Current edition approved July 1, 2023. Published July 2023. Originally approved
in 1959. Last previous edition approved in 2018 as D1670/D1670M – 11 (2018). The sole source of supply of the apparatus known to the committee at this time
DOI: 10.1520/D1670_D1670M-11R23. is Electrotechnic Model BD-40B Spark Generator, available from Electro-Technic
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Products Co., 4642 N. Ravenswood Ave., Chicago, IL 60642. If you are aware of
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D1670/D1670M − 11 (2023)
FIG. 1 Feeler
5.1.1 The cross-dimension of the wire loop is to be 50 6
3 1
5 mm [1 ⁄4 6 ⁄8 in.].
5.1.2 The device is capable of delivering a 5 kV peak
voltage and of operating at 60 Hz.
FIG. 2 Counting Grid
5.2 Photographic Equipment—A supply of sheets of matte
surface, regular weight photocopy paper or linagraphic paper
cut to the dimensions of the test panel, developer, and fixing
8. Procedures for Weathering
chemicals.
8.1 Outdoor Weathering—Expose specimens to outdoor
5.3 Counting Grid, as shown in Fig. 2. Photocopy the grid
weathering in accordance with requirements of Practice D1435
on a transparency film that is suitable for use with plain paper
at a site, rack angle, and backing to be agreed on by the
copiers. Trim the outside edges to the exact dimensions of the
interested parties.
test panel, making sure that the grid and the bituminous film on
8.2 Laboratory-Accelerated Weathering—Expose speci-
the test panel are aligned.
mens to laboratory-accelerated weathering in accordance with
3 7
Outside dimensions, mm [in.] 69.8 by 149.1 [2 ⁄4 by 5 ⁄8 ] or
procedures described in Practice D4798/D4798M or D4799/
panel size
7 7
D4799M. The practice used and the specific
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