ASTM D1670-98

Standard Test Method for Failure End Point in Accelerated and Outdoor Weathering of Bituminous Materials

SCOPE
1.1 This test method covers the determination of failure due to cracking of bituminous materials undergoing accelerated or outdoor weathering, on electrically conductive backings.
1.2 This standard does not purport to address 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.

General Information

• Status: Historical
• Publication Date: 09-Jul-1998
• Technical Committee: D08 - Roofing and Waterproofing
• Drafting Committee: D08.02 - Steep Roofing Products and Assemblies

Relations

• Replaced By: ASTM D1670-98(2003) - Standard Test Method for Failure End Point in Accelerated and Outdoor Weathering of Bituminous Materials
• Effective Date: 10-Apr-2003

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 1670 – 98
Standard Test Method for
Failure End Point in Accelerated and Outdoor Weathering of
Bituminous Materials
This standard is issued under the fixed designation D 1670; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.2 Photographic Equipment—A supply of sheets of matte
surface, regular weight, photo copy paper cut to the dimen-
1.1 This test method covers the determination of failure due
sions of the test panel, developer, and fixing chemicals.
to cracking of bituminous materials undergoing accelerated or
4.3 Counting Grid as shown in Fig. 1: Photocopy the grid on
outdoor weathering, on electrically conductive backings.
a transparency film that is suitable for use with plain paper
1.2 This standard does not purport to address the safety
copiers. Trim the outside edges to the exact dimensions of the
concerns, if any, associated with its use. It is the responsibility
test panel making sure that the grid and the bituminous film on
of the user of this standard to establish appropriate safety and
the test panel are aligned.
health practices and determine the applicability of regulatory
3 7
Outside dimensions, in. (mm) 2 ⁄4by 5 ⁄8 (69.8 by 149.1) or panel size
limitations prior to use.
7 7
Grid dimensions, in. (mm) 1 ⁄8 by 4 ⁄8 (47.6 by 123.8)
Number of squares in grid 260 (10 by 26)
2. Summary of Test Method
Size of squares, in. (mm) ⁄16 (4.76)
2.1 Dry, weathered, bituminous-coated test panels are
5. Calibration of the Spark-Generating Apparatus
grounded and a feeler electrode is passed over the bituminous
5.1 Voltage—Calibrate the peak voltage of the spark gen-
surface. Before re-exposure, a photographic record is made of
erator to 5 6 0.5 kV according to the manufacturer’s instruc-
all panels showing sparking in 15 or more positions. The
tions.
photographs are covered with a grid, and when sparking has
occurred in 26 or more grid squares, failure is reported.
6. Detection of Cracks in Weathered Film
3. Significance and Use
6.1 At the end of an exposure period, remove the test panel
from the weathering unit or outdoor exposure site. Allow the
3.1 The extent of cracking or pitting of bituminous films is
panels to dry thoroughly and bring them to room temperature.
a measure of the extent of deterioration due to weathering.
6.2 Ground each panel at the back surface or the conductive
Failure due to cracking is more accurately determined electri-
edge. The test feeler (see Fig. 2 for example) of the spark
cally than visually.
instrument should be passed over the complete surface of the
3.2 Failure determined by this test method will depend not
bituminous film in 5 to 10 s. The number of sparks should be
only on the characteristics of the asphalt and the extent of
noted during the pass. If the number of sparkthrough points on
weathering, but also on the film thickness, and the amount and
any panel is less than 15, at least ⁄16 in. apart, set the panel
type of mineral filler present.
aside for re-exposure. Make a photographic record of the rest
4. Apparatus
of the specimens showing sparking in 15 or more positions.
Place one of the photocopy sheets (cut to the exact dimensions
4.1 Any Spark-Generating Apparatus, capable of deliver-
ing a 5-kV peak voltage and of operating at 60 Hz. of the test panel) emulsion side down on the panel, making sure
that the sheet and the panel are aligned, and pass the test feeler
of the spark gap instrument over the back of the paper. The
This test method is under the jurisdiction of ASTM Committee D-8 on Roofing,
complete passage from top to bottom shall be within 5 to 10 s.
Waterproofing, and Bituminous Materials and is the direct responsibility of
Subcommittee D08.02 on Prepared Roofings, Shingles, and Siding Materials.
Current edition approved July 10, 1998. Published September 1998. Originally
e1 3
published as D 1670 – 59 T. Last previous edition D 1670 – 90 (1994) . Thermal facsi
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