ASTM C734-15(2019)

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:C734 −15 (Reapproved 2019)
Standard Test Method for
Low-Temperature Flexibility of Latex Sealants After Artificial
Weathering
This standard is issued under the fixed designation C734; 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 4. Summary of Test Method
1.1 This test method covers a laboratory procedure for the 4.1 A slab of the sealant is exposed, after drying, for a
determination of low-temperature flexibility of latex sealants minimum of 500 h in an artificial weathering unit, after which
after 500 h artificial weathering. it is conditioned and flexed at−17 61°C(0 6 2 °F).
1.2 The values stated in metric (SI) units are to be regarded
5. Significance and Use
as the standard. The values given in parentheses are for
5.1 This test evaluates the flexibility of artificially weath-
information only.
ered latex sealants in a low-temperature environment.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Apparatus
responsibility of the user of this standard to establish appro-
6.1 T3 Temper Alclad Aluminum Panels, three, each 76 by
priate safety, health, and environmental practices and deter-
153-mm (3 by 6-in.) of 16 to 24 gauge (1.29 to 0.511 mm).
mine the applicability of regulatory limitations prior to use.
6.2 Accelerated Weathering Device—One of the units as
NOTE 1—Currently there is no ISO standard similar to this test method.
described in Practice C1442. Because of differences in spectral
1.4 This international standard was developed in accor-
power distributions of the exposure sources and exposure
dance with internationally recognized principles on standard-
parameters used in the different types of devices described in
ization established in the Decision on Principles for the
Practice C1442, test results may differ with the type of
Development of International Standards, Guides and Recom-
accelerated weathering device. Choice of type of device shall
mendations issued by the World Trade Organization Technical
be by mutual agreement among the interested parties.
Barriers to Trade (TBT) Committee.
6.3 Cold Box or Freezer.
2. Referenced Documents
6.4 Mandrel, Wood or Metal, 25 mm (1 in.) in diameter.
2.1 ASTM Standards:
6.5 Template, consisting of a 3.2-mm ( ⁄8-in.) thick brass
C717Terminology of Building Seals and Sealants
plate with a rectangular opening 38 by 127 mm (1 ⁄2 by 5 in.).
C1442Practice for Conducting Tests on Sealants Using
6.6 Spatula, metal.
Artificial Weathering Apparatus
7. Sampling
3. Terminology
7.1 Take the sealant to be tested directly from the container
3.1 Definitions—Refer to Terminology C717 for definitions
as commercially supplied by the manufacturer.
of the following terms used in this test method: adhesive
failure, latex sealant, sealant, substrate, and standard condi-
8. Test Specimens
tions.
8.1 Prepare three test specimens as follows:
8.1.1 Center the template on an aluminum panel, fill it to
excess with the sealant, and strike the excess off flush with the
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
surface of the template with the metal spatula.
Weathering.
8.1.2 Cut around the perimeter of the sealant, next to the
Current edition approved Oct
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