ASTM D4799-03

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Designation:D4799–03
Standard Practice for
Accelerated Weathering Test Conditions and Procedures for
Bituminous Materials (Fluorescent UV, Water Spray, and
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Condensation Method)
This standard is issued under the fixed designation D 4799; 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 3. Summary of Test Method
1.1 This practice describes test conditions and procedures 3.1 Thin films of bitumen are uniformly applied to alumi-
for fluorescent UV and condensation exposures conducted num panels. Shingles and similar materials are cut to size and
according to Practices G 151 and G 154 for bituminous roofing exposed to specified cycles of temperature, light, and water. A
and waterproofing materials that have a minimum softening choice of three test cycles is given along with options for
point of approximately 95°C (200°F) as determined by Test determining the period of exposure and evaluating results.
Method D 36. (Also see Terminology G 113.)
4. Significance and Use
1.2 The values stated in SI units are to be regarded as the
4.1 This weathering apparatus is used for comparing the
standard. The values given in parentheses are for information
only. weathering characteristics of bituminous materials against a
reference material in which the outdoor weathering character-
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the istics are known. It is not possible to establish a precise
correlation between accelerated and natural weathering be-
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- cause of geographical climatic variations, local weather varia-
tion from normal, and local pollutants. Guide G 141 provides
bility of regulatory limitations prior to use.
guidance regarding this issue.
2. Referenced Documents
5. Apparatus
2.1 ASTM Standards:
5.1 The fluorescent UV and condensation apparatus used
D 36 Test Method for Softening Point of Bitumen (Ring-
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and-Ball Apparatus) shall conform to the requirements defined in Practices G 151
and G 154.
D 1669 Practice for Preparation of Test Panels for Acceler-
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ated and Outdoor Weathering of Bituminous Coatings 5.2 Lamps—Unless otherwise specified, the lamps shall be
fluorescent UV-B lamps as described in 6.1.3.3 of Practice
D 1670 Test Method for Failure End Point in Accelerated
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and Outdoor Weathering of Bituminous Materials G 154.
5.2.1 Other fluorescent UV lamps meeting the size and
G 113 Terminology Relating to Natural and Artificial
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Weathering Tests of Nonmetallic Materials electrical characteristics in 5.2 may be used if mutually agreed
upon and provided that the lamp and spectral energy distribu-
G 141 Guide forAddressingVariability in ExposureTesting
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of Nonmetallic Materials tion are reported in conformance with Section 9.
5.3 Moisture—It is permitted to expose the test specimens
G 147 Practice for Conditioning and Handling of Nonme-
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tallicMaterialsforNaturalandArtificialWeatheringTests to moisture in the form of water spray, condensation, or high
humidity.
G 151 Practice for Exposing Nonmetallic Materials in Ac-
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celerated Test Devices that Use Laboratory Light Sources 5.3.1 WaterSpray—It is permitted to equip the test chamber
with a means to introduce intermittent water spray onto the test
G 154 Practice for Operating Fluorescent Light Apparatus
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for UV Exposure of Nonmetallic Materials specimens under specified conditions. The spray shall be
uniformly distributed over the samples. The spray system shall
be made from corrosion resistant materials that do not con-
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ThispracticeisunderthejurisdictionofASTMCommitteeD08onRoofingand
taminate the water used.
Waterproofing and is the direct responsibility of Subcommittee D08.02 on Prepared
5.3.1.1 Spray Water Quality—Spray water shall have a
Roofings, Shingles, and Siding Materials.
conductivity below 5 µS/cm, contain less than 1-ppm solids,
Current edition approved Jan. 10, 2003. Published February 2003. Originally
approved in 1988. Last previous edition approved in 2000 as D 4799 – 00.
and leave no observable stains or deposits on the specimens.
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Annual Book of ASTM Standards, Vol 04.04.
Very low levels of silica in spray water can cause significant
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Annual Book of ASTM Standards, Vol 14.04.
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D4799–03
NOTE 1—The cycle to be employed shall be specified in the product
deposits on the surface of test
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