ASTM C732-17(2022)

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:C732 −17 (Reapproved 2022)
Standard Test Method for
Aging Effects of Artificial Weathering on Latex Sealants
This standard is issued under the fixed designation C732; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 4. Summary of Test Method
1.1 This test method covers a laboratory procedure for the 4.1 The sealant is placed in a specially constructed wood-
determination of aging effects of artificial weathering on latex and-aluminum fixture (referred to as a “channel panel”) and
sealants. exposedforintervalsof500 htospecifiedalternatewetanddry
cycles in an accelerated weathering unit, then periodically
1.2 The values stated in SI units are to be regarded as
examined for evidences of deterioration.
standard. The values given in parentheses after SI units are
provided for information only and are not considered standard.
5. Significance and Use
1.3 This standard does not purport to address all of the
5.1 Accelerated weathering exposure serves to indicate
safety concerns, if any, associated with its use. It is the
long-term exterior durability of the sealant. In this test method,
responsibility of the user of this standard to establish appro-
durability is tested when the sealant is used with wood or
priate safety, health, and environmental practices and deter-
aluminum.
mine the applicability of regulatory limitations prior to use.
NOTE 1—Currently there is no ISO standard similar to this test method.
6. Apparatus
1.4 This international standard was developed in accor-
6.1 Accelerated Weathering Device—One of the units as
dance with internationally recognized principles on standard-
described in Practice C1442. Because of differences in spectral
ization established in the Decision on Principles for the
power distributions of the exposure sources and exposure
Development of International Standards, Guides and Recom-
parameters used in the different types of devices described in
mendations issued by the World Trade Organization Technical
Practice C1442, test results may differ with the type of
Barriers to Trade (TBT) Committee.
accelerated weathering device. Choice of type of device shall
be by mutual agreement among the interested parties.
2. Referenced Documents
6.2 Channel Panel attached to a Sample Holder, as shown
2.1 ASTM Standards:
in Fig. 1.
C717 Terminology of Building Seals and Sealants
6.3 Knife, for tooling.
C1442 Practice for Conducting Tests on Sealants Using
Artificial Weathering Apparatus
7. Sampling
3. Terminology
7.1 Use the sealant to be tested directly from the container
as commercially supplied by the manufacturer.
3.1 Definitions:
3.1.1 Definitions of the following terms are found in Ter-
8. Test Specimens
minology C717: adhesive failure (loss of adhesion); latex
8.1 Prepare two 25 mm by 70 mm by 175 mm (1-in. by
sealant; sealant, standard conditions.
2 ⁄4-in. by 7-in.) wood-and-aluminum channel panels as shown
in Fig. 1, using the following materials:
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
8.1.1 ExteriorFirPlywood,withawater-resistantthermoset
Seals and Sealantsand is the direct responsibility of Subcommittee C24.40 on
glue such as urea or melamine-formaldehyde type.
Weathering.
8.1.2 Ponderosa Pine Sapwood, white kiln dried and free of
Current edition approved Jan. 1, 2022. Published January 2022. Originally
knots or imperfections.
approved in 1972. Last previous edition approved in 2017 as C732 – 17. DOI:
10.1520/C0732-17R22.
8.1.3 Aluminum Alloy 6063-T5 or 6061-T6, clear, anodized
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
a minimum of 30 min over a scale-free finish.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
8.1.4 Polyethylene Bond-Breaker of low-density film ap-
Standards
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