ASTM D4799/D4799M-17(2023)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D4799/D4799M − 17 (Reapproved 2023)
Standard Practice for
Accelerated Weathering Test Conditions and Procedures for
Bituminous Materials (Fluorescent UV, Water Spray, and
Condensation Method)
This standard is issued under the fixed designation D4799/D4799M; 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 D1670/D1670M Test Method for Failure End Point in Ac-
celerated and Outdoor Weathering of Bituminous Materi-
1.1 This practice describes test conditions and procedures
als
for fluorescent UV and condensation exposures conducted
G113 Terminology Relating to Natural and Artificial Weath-
according to Practices G151 and G154 for bituminous roofing
ering Tests of Nonmetallic Materials
and waterproofing materials. (See Terminology G113.)
G141 Guide for Addressing Variability in Exposure Testing
1.2 The values stated in either SI units or inch-pound units
of Nonmetallic Materials
are to be regarded separately as standard. The values stated in
G147 Practice for Conditioning and Handling of Nonmetal-
each system may not be exact equivalents; therefore, each
lic Materials for Natural and Artificial Weathering Tests
system shall be used independently of the other. Combining
G151 Practice for Exposing Nonmetallic Materials in Accel-
values from the two systems may result in non-conformance
erated Test Devices that Use Laboratory Light Sources
with the standard.
G154 Practice for Operating Fluorescent Ultraviolet (UV)
1.3 This standard does not purport to address all of the
Lamp Apparatus for Exposure of Materials
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3. Summary of Test Method
priate safety, health, and environmental practices and deter-
3.1 Thin films of bitumen are uniformly applied to alumi-
mine the applicability of regulatory limitations prior to use.
num panels. Shingles and similar materials are cut to size and
1.4 This international standard was developed in accor-
exposed to specified cycles of temperature, light, and water. A
dance with internationally recognized principles on standard-
choice of six test cycles is given along with options for
ization established in the Decision on Principles for the
determining the period of exposure and evaluating results.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Significance and Use
Barriers to Trade (TBT) Committee.
4.1 This weathering apparatus is used for comparing the
weathering characteristics of bituminous materials against a
2. Referenced Documents
control material for which the outdoor weathering characteris-
2.1 ASTM Standards:
tics are known. It is not possible to establish a precise
D36/D36M Test Method for Softening Point of Bitumen
correlation between accelerated and natural weathering be-
(Ring-and-Ball Apparatus)
cause (1) there are geographical climatic variations, local
D1669/D1669M Practice for Preparation of Test Panels for
weather variations, and variations in local pollutants, and (2)
Accelerated and Outdoor Weathering of Bituminous Coat-
the relation between accelerated and natural weathering is
ings
material dependent. Acceleration factors differ between mate-
rials as well as between formulations of the same material.
Guide G141 provides guidance regarding this issue.
This practice is under the jurisdiction of ASTM Committee D08 on Roofing and
Waterproofing and is the direct responsibility of Subcommittee D08.02 on Steep
NOTE 1—This practice can be used for other than bituminous materials,
Roofing Products and Assemblies.
but the significance and use have not been evaluated.
Current edition approved Feb. 1, 2023. Published February 2023. Originally
approved in 1988. Last previous edition approved in 2017 as D4799/D4799M – 17.
5. Apparatus
DOI: 10.1520/D4799_D4799M-17R23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1 The fluorescent UV and condensation apparatus used
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
shall conform to the requirements defined in Practices G151
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. and G154.
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D4799/D4799M − 17 (2023)
5.2 Lamps—The lamps shall be fluorescent UVA-340 lamps Practice G154, Section 9.5, to ensure equal radiant exposure on
as described in 6.1.3.1 of Practice G154. all specimens or to compensate for differences within the
exposure chamber. If the specimens do not completely fill all of
5.3 Moisture—It is permitted to expose the test specimens to
the spaces, fill the empty spaces with blank panels of corrosion
moisture in the form of water spray, condensation, or high
resistant material to maintain the test conditions within the
humidity.
chamber.
5.3.1 Water Spray—It is permitted to equip the test chamber
Cycle A— 4 h UV at 60 °C ± 2.5 °C, alternating with 4 h condensation
with a means to introduce intermittent water spray onto the test
at 50 °C ± 2.5 °C.
specimens under specified conditions. The spray shall be
Cycle B— 20 h UV at 60 °C ± 2.5 °C, alternating with 4 h condensation
uniformly distributed over the samples. The spray system shall
at 50 °C ± 2.5 °C.
Cycle C— 20 h UV at 80 °C ± 2.5 °C, alternating with 4 h condensation
be made from corrosion resistant materials that do not con-
at 50 °C ± 2.5 °C.
taminate the water used.
Cycle D— 4 h UV at 60 °C ± 2.5 °C, 15 min water spray, alternating with
5.3.1.1 Spray Water Quality—Spray water shall have a 3.75 h condensation at 50 °C ± 2.5 °C.
Cycle E— 20 h UV at 60 °C ± 2.5 °C, 15 min water spray, alternating with
conductivity below 5 μS/cm, contain less than 1 ppm solids,
3.75 h condensation at 50 °C ± 2.5 °C.
and leave no observable stains or deposits on the specimens.
Cycle F— 20 h UV at 80 °C ± 2.5 °C, 15 min water spray, alternating with
Very low levels of silica in spray water can cause significant 3.75 h condensation at 50 °C ± 2.5 °C.
deposits on the surface of test specimens. Care should be taken
7.3 If inspection of the panels is to be per
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