ASTM D4798/D4798M-11

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Designation:D4798/D4798M–10 Designation:D4798/D4798M–11
Standard Practice for
Accelerated Weathering Test Conditions and Procedures for
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Bituminous Materials (Xenon-Arc Method)
This standard is issued under the fixed designation D4798/D4798M; 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
1.1 This practice covers test conditions and procedures for xenon-arc exposures according to Practices G151 and G155 for
bituminous roofing and waterproofing materials that have a minimum softening point of approximately 95°C [200°F] as
determined by Test Method D36. (Also see Terminology for bituminous roofing and waterproofing materials. (See Terminology
G113.)
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
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.
2. Referenced Documents
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2.1 ASTM Standards: D36Test Method for Softening Point of Bitumen (Ring-and-Ball Apparatus)
D1669 Practice for Preparation of Test Panels for Accelerated and Outdoor Weathering of Bituminous Coatings
D1670 Test Method for Failure End Point in Accelerated and Outdoor Weathering of Bituminous Materials
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
G141 Guide for Addressing Variability in Exposure Testing of Nonmetallic Materials
G147 Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests
G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
G155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials
G169 Guide for Application of Basic Statistical Methods to Weathering Tests
3. Summary of Test Method
3.1 Thin films of bitumen are uniformly applied to aluminum panels. Shingles and similar products are cut to size and exposed
to specified cycles of temperature, light, and water. A choice of two test cycles is given along with options for determining the
period of exposure and evaluating results.
4. Significance and Use
4.1 Tests conducted according to this practice are used to compare the weathering characteristics of bituminous materials versus
a control material of known outdoor durability. It is not possible to establish a single relationship that is applicable to all materials
between time in accelerated tests conducted according to this practice and time in natural weathering because (1) there are
geographical climatic variations, local weather variations, and variations in local pollutants, and (2) the relation between
accelerated and natural weathering is material dependent with differences in acceleration factors between materials as well as for
different formulations of the same material. Guide G141 provides guidance regarding variability in outdoor and accelerated
weathering tests and about the use of control materials.
NOTE 1—It is recommended that outdoor weathering be used to validate the laboratory accelerated test in terms of performance ranking.
NOTE 2—This practice can be used for other than bituminous materials, but the significance and use have not been evaluated.
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This practice is under the jurisdiction ofASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.02 on Steep Roofing
Products and Assemblies.
Current edition approved JulyJan. 1, 2010.2011. Published January 2011. Originally approved in 1988. Last previous edition approved in 20092010 as D4798/
D4798M – 109. DOI: 10.1520/D4798_D4798M-101.
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volume information, refer to the standard’s Document Summary page on the ASTM website.
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