ASTM D4798-08
(Test Method)Standard Practice for Accelerated Weathering Test Conditions and Procedures for Bituminous Materials (Xenon-Arc Method)
Standard Practice for Accelerated Weathering Test Conditions and Procedures for Bituminous Materials (Xenon-Arc Method)
SIGNIFICANCE AND USE
It is not possible to establish a precise correlation between accelerated and 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. This weathering apparatus and procedure are used for comparing the weathering characteristics of bituminous materials against a control material for which the outdoor weathering characteristics are known. Guide G 141 provides guidance regarding this issue.
Note 1—This practice can be used for other than bituminous materials, but the significance and use have not been evaluated.
SCOPE
1.1 This practice covers test conditions and procedures for xenon-arc exposures according to Practices G 151 and G 155 for bituminous roofing and waterproofing materials that have a minimum softening point of approximately 95°C (200°F) as determined by Test Method D 36. (Also see Terminology G 113.)
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:D4798–08
Standard Practice for
Accelerated Weathering Test Conditions and Procedures for
1
Bituminous Materials (Xenon-Arc Method)
This standard is issued under the fixed designation D4798; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope for Exposure of Non-Metallic Materials
1.1 This practice covers test conditions and procedures for
3. Summary of Test Method
xenon-arc exposures according to Practices G151 and G155
3.1 Thin films of bitumen are uniformly applied to alumi-
for bituminous roofing and waterproofing materials that have a
num panels. Shingles and similar products are cut to size and
minimum softening point of approximately 95°C (200°F) as
exposed to specified cycles of temperature, light, and water.A
determined by Test Method D36. (Also see Terminology
choice of two test cycles is given along with options for
G113.)
determining the period of exposure and evaluating results.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Significance and Use
only.
4.1 It is not possible to establish a precise correlation
1.3 This standard does not purport to address all of the
between accelerated and natural weathering because (1) there
safety concerns, if any, associated with its use. It is the
are geographical climatic variations, local weather variations,
responsibility of the user of this standard to establish appro-
and variations in local pollutants, and (2) the relation between
priate safety and health practices and determine the applica-
accelerated and natural weathering is material dependent with
bility of regulatory limitations prior to use.
differences in acceleration factors between materials as well as
2. Referenced Documents for different formulations of the same material. This weather-
2 ing apparatus and procedure are used for comparing the
2.1 ASTM Standards:
weathering characteristics of bituminous materials against a
D36 Test Method for Softening Point of Bitumen (Ring-
control material for which the outdoor weathering characteris-
and-Ball Apparatus)
tics are known. Guide G141 provides guidance regarding this
D1669 Practice for Preparation of Test Panels forAcceler-
issue.
ated and Outdoor Weathering of Bituminous Coatings
D1670 Test Method for Failure End Point in Accelerated
NOTE 1—Thispracticecanbeusedforotherthanbituminousmaterials,
and Outdoor Weathering of Bituminous Materials but the significance and use have not been evaluated.
G113 Terminology Relating to Natural and Artificial
5. Apparatus
Weathering Tests of Nonmetallic Materials
5.1 The xenon-arc apparatus used shall conform to the
G141 GuideforAddressingVariabilityinExposureTesting
requirements defined in Practices G151 and G155.
of Nonmetallic Materials
5.2 Filters—Daylight filter as described in Practice G155.
G147 Practice for Conditioning and Handling of Nonme-
5.3 Radiometer—The use of a radiometer to monitor and
tallic Materials for Natural andArtificial Weathering Tests
control the amount of radiant energy received at the specimen
G151 Practice for Exposing Nonmetallic Materials in Ac-
is required. The use of the radiometer shall comply with the
celerated Test Devices that Use Laboratory Light Sources
requirements in Practice G151.
G155 Practice for Operating Xenon Arc Light Apparatus
6. Test Specimens
1
ThispracticeisunderthejurisdictionofASTMCommitteeD08onRoofingand
6.1 Unless otherwise agreed upon, test specimens shall be
Waterproofing and is the direct responsibility of Subcommittee D08.02 on Prepared
3 7
approximately 70 by 150 mm (2 ⁄4 by 5 ⁄8 in.). Bituminous
Roofings, Shingles and Siding Materials.
materials shall be applied as uniform coatings on aluminum
Current edition approved Feb. 1, 2008. Published March 2008. Originally
approved in 1988. Last previous edition approved in 2004 as D4798–04.
panels in accordance with Practice D1669. Fabricated materi-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
als such as bituminous roofing, shingles, and similar products
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
shall be cut to size and their weather surfaces exposed. If these
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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D4798–08
are too flexible to sustain their own weight in a vertical 7.3.1 Cycle A—51-min light only exposure, 9-min light and
posit
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D4798–04 Designation:D4798–08
Standard Practice for
Accelerated Weathering Test Conditions and Procedures for
1
Bituminous Materials (Xenon-Arc Method)
This standard is issued under the fixed designation D4798; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) 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 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D36 Test 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 onof 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 Nonm-Metallic Materials
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
4.1It is not possible to establish a precise correlation between accelerated and natural weathering because of geographical
climatic variations, local weather variation from normal, and local pollutants. This weathering apparatus and procedure are used
forcomparingtheweatheringcharacteristicsofbituminousmaterialsagainstareferencematerialforwhichtheoutdoorweathering
characteristics are known. Guide G141
4.1 It is not possible to establish a precise correlation between accelerated and 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. This weathering apparatus and procedure are used for comparing the weathering
characteristics of bituminous materials against a control material for which the outdoor weathering characteristics are known.
Guide G141 provides guidance regarding this issue.
NOTE 1—This practice can be used for other than bituminous materials, but the significance and use have not been evaluated.
1
This practice is under the jurisdiction of ASTM Committee D08 on Roofing and Waterproofing and is the direct responsibility of Subcommittee D08.02 on Prepared
Roofings, Shingles,Shingles and Siding Materials.
Current edition approved Nov.Feb. 1, 2004.2008. Published November 2004.March 2008. Originally approved in 1988. Last previous edition approved in 20012004 as
D4798–014.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D4798–08
5. Apparatus
5.1 The xenon-arc apparatus used shall conform to the requirements defined in Practices G151 and G155.
5.2 Filters—Daylight filter as des
...
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