ASTM D4798-00
(Test Method)Standard Test Method for Accelerated Weathering Test Conditions and Procedures for Bituminous Materials (Xenon-Arc Method)
Standard Test Method for Accelerated Weathering Test Conditions and Procedures for Bituminous Materials (Xenon-Arc Method)
SCOPE
1.1 This test method covers test conditions and procedures for xenon-arc exposures according to Practice G151 and G155 for bituminous roofing and waterproofing materials having a minimum softening point of approximately 95°C (200°F) as determined by Test Method D36.(Also see Terminology G113.)
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of 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.
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Designation: D 4798 – 00
Standard Test Method for
Accelerated Weathering Test Conditions and Procedures for
Bituminous Materials (Xenon-Arc Method)
This standard is issued under the fixed designation D 4798; 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 num panels. Shingles and similar products are cut to size and
exposed to specified cycles of temperature, light, and water. A
1.1 This test method covers test conditions and procedures
choice of two test cycles is given along with options for
for xenon-arc exposures according to Practices G 151 and
determining the period of exposure and evaluating results.
G 155 for bituminous roofing and waterproofing materials that
have a minimum softening point of approximately 95°C
4. Significance and Use
(200°F) as determined by Test Method D 36. (Also see
4.1 It is not possible to establish a precise correlation
Terminology G 113.)
between accelerated and natural weathering because of geo-
1.2 The values stated in SI units are to be regarded as the
graphical climatic variations, local weather variation from
standard. The values given in parentheses are for information
normal, and local pollutants. This weathering apparatus and
only.
procedure are used for comparing the weathering characteris-
1.3 This standard does not purport to address all of the
tics of bituminous materials against a reference material for
safety concerns, if any, associated with its use. It is the
which the outdoor weathering characteristics are known. Guide
responsibility of the user of this standard to establish appro-
G 141 provides guidance regarding this issue.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Apparatus
5.1 The xenon-arc apparatus used shall conform to the
2. Referenced Documents
requirements defined in Practices G 151 and G 155.
2.1 ASTM Standards:
5.2 Filters—Daylight filter as described in Practice G 155.
D 36 Test Method for Softening Point of Bitumen (Ring-
2 5.3 Radiometer —The use of a radiometer to monitor and
and-Ball Apparatus)
control the amount of radiant energy received at the specimen
D 1669 Practice for Preparation of Test Panels for Acceler-
2 is required. The use of the radiometer shall comply with the
ated and Outdoor Weathering of Bituminous Coatings
requirements in Practice G 151.
D 1670 Test Method for Failure End Point in Accelerated
and Outdoor Weathering of Bituminous Materials
6. Test Specimens
G 113 Terminology Relating to Natural and Artificial
3 6.1 Unless otherwise agreed upon, test specimens shall be
Weathering Tests of Nonmetallic Materials
3 7
approximately 70 by 150 mm (2 ⁄4by 5 ⁄8 in.). Bituminous
G 141 Guide for Addressing Variability in Exposure Testing
3 materials shall be applied as uniform coatings on aluminum
on Nonmetallic Materials
panels in accordance with Practice D 1669. Fabricated materi-
G 147 Practice for Conditioning and Handling of Nonme-
3 als such as bituminous roofing, shingles, and similar products
tallic Materials for Natural and Artificial Weathering Tests
shall be cut to size and their weather surfaces exposed. If these
G 151 Practice for Exposing Nonmetallic Materials in Ac-
3 are too flexible to sustain their own weight in a vertical
celerated Test Devices that Use Laboratory Light Sources
position, they may be mounted on aluminum panels.
G 155 Practice for Operating Xenon Arc Light Apparatus
3 6.1.1 Unless otherwise specified, expose at least three rep-
for Exposure of Nonmetallic Materials
licate specimens of each test and control material.
3. Summary of Test Method 6.1.2 Other test specimen sizes may be used to provide
sufficient material for post-exposure testing when desired.
3.1 Thin films of bitumen are uniformly applied to alumi-
6.1.3 Follow the procedures described in Practice G 147 for
identification, conditioning, and handling of specimens of test,
This test method is under the jurisdiction of ASTM Committee D-8 on Roofing,
control, and reference materials prior to, during, and after
Waterproofing, and Bituminous Materials and is the direct responsibility of
exposure.
Subcommittee D08.02 on Prepared Roofings, Shingles, and Siding Materials.
Current edition approved Jan. 10, 2000. Published March 2000. Originally 6.1.4 Do not mask the face of a specimen for the purpose of
published as D 4798 – 88. Last previous edition D 4798 – 95.
showing on one panel the effects of various exposure times.
Annual Book of ASTM Standards, Vol 04.04.
Misleading results may be obtained by this method, since the
Annual Book of ASTM Standards, Vol 14.04.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
D 4798
masked portion of the specimen is still exposed to temperature performed, the transfer of the panels from the exposure
and humidity cycles that in many cases will affect results. apparatus to the refr
...
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