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ASTM C734-06

(Test Method)

Standard Test Method for Low-Temperature Flexibility of Latex Sealants After Artificial Weathering

Standard Test Method for Low-Temperature Flexibility of Latex Sealants After Artificial Weathering

SIGNIFICANCE AND USE
This test evaluates the flexibility of artificially weathered latex sealants in a low-temperature environment.
SCOPE
1.1 This test method covers a laboratory procedure for the determination of low-temperature flexibility of latex sealants after 500 h artificial weathering.
1.2 The values stated in metric (SI) units are to be regarded as the standard. The values given in parentheses are for information only.
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.Note 1
Currently there is no ISO standard similar to this test method.

General Information

Status
Historical
Publication Date
31-Aug-2006
ICS
91.100.50 - Binders. Sealing materials
Technical Committee
C24 - Building Seals and Sealants
Drafting Committee
C24.40 - Weathering
Current Stage
Ref Project

Relations

Replaces
ASTM C734-01 - Standard Test Method for Low-Temperature Flexibility of Latex Sealants After Artificial Weathering
Effective Date
01-Sep-2006
Replaced By
ASTM C734-06(2012) - Standard Test Method for Low-Temperature Flexibility of Latex Sealants After Artificial Weathering
Effective Date
01-Jun-2012
Referred By
ASTM C1193-16(2023) - Standard Guide for Use of Joint Sealants
Effective Date
01-Sep-2006
Referred By
ASTM C1021-08(2023) - Standard Practice for Laboratories Engaged in Testing of Building Sealants
Effective Date
01-Sep-2006
Referred By
ASTM C834-17(2023) - Standard Specification for Latex Sealants
Effective Date
01-Sep-2006

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ASTM C734-06 - Standard Test Method for Low-Temperature Flexibility of Latex Sealants After Artificial WeatheringASTM C734-06 - Standard Test Method for Low-Temperature Flexibility of Latex Sealants After Artificial Weathering
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ASTM C734-06 - Standard Test Method for Low-Temperature Flexibility of Latex Sealants After Artificial Weathering
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C734 – 06
Standard Test Method for
Low-Temperature Flexibility of Latex Sealants After Artificial
1
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 6. Apparatus
1.1 This test method covers a laboratory procedure for the 6.1 T3 Temper Alclad Aluminum Panels, three, each 76 by
determination of low-temperature flexibility of latex sealants 153-mm (3 by 6-in.) of 16 to 24 gage (1.29 to 0.511 mm).
after 500 h artificial weathering. 6.2 Accelerated Weathering Device—One of the units as
1.2 The values stated in metric (SI) units are to be regarded described in Practice C1442. Because of differences in spectral
as the standard. The values given in parentheses are for power distributions of the exposure sources and exposure
information only. parameters used in the different types of devices described in
1.3 This standard does not purport to address all of the Practice C1442, test results may differ with the type of
safety concerns, if any, associated with its use. It is the accelerated weathering device. Choice of type of device shall
responsibility of the user of this standard to establish appro- be by mutual agreement among the interested parties.
priate safety and health practices and determine the applica- 6.3 Cold Box or Freezer.
bility of regulatory limitations prior to use. 6.4 Mandrel, Wood or Metal, 25 mm (1 in.) in diameter.
1
6.5 Template, consisting of a 3.2-mm ( ⁄8-in.) thick brass
NOTE 1—Currently there is no ISO standard similar to this test method.
1
plate with a rectangular opening 38 by 127 mm (1 ⁄2 by 5 in.).
6.6 Spatula, metal.
2. Referenced Documents
2
2.1 ASTM Standards:
7. Sampling
C717 Terminology of Building Seals and Sealants
7.1 Take the sealant to be tested directly from the container
C1442 Practice for Conducting Tests on Sealants Using
as commercially supplied by the manufacturer.
Artificial Weathering Apparatus
8. Test Specimens
3. Terminology
8.1 Prepare three test specimens as follows:
3.1 Definitions—Refer to Terminology C717 for definitions
8.1.1 Center the template on an aluminum panel, fill it to
of the following terms used in this test method: adhesive
excess with the sealant, and strike the excess off flush with the
failure, latex sealant, sealant, substrate.
surface of the template with the metal spatula.
8.1.2 Cut around the perimeter of the sealant, next to the
4. Summary of Test Method
template, with the spatula, and carefully remove template.
4.1 A slab of the sealant is exposed, after drying, for a
minimum of 500 h in an artificial weathering unit, after which
9. Conditioning
it is conditioned and flexed at−17 6 1°C (0 6 2°F).
9.1 Condition the three specimens for 2 days at standard
conditions.
5. Significance and Use
5.1 This test evaluates the flexibility of artificially weath-
10. Procedure
ered latex sealants in a low-temperature environment.
10.1 Placetheconditionedspecimensintheartificialweath-
ering unit and cycle them for a minimum of 500 h, beginning
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
withthestartofthelight
...

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5.1 It is known that solar radiation contributes to the degradation of sealants in exterior building joints. The use of a laboratory accelerated weathering machine with actinic radiation, moisture and heat appears to be a feasible means to give indications of early degradation by the appearance of sealant cracking. However, simulated weather factors in combination with extension may produce more severe degradation than weather factors only. Therefore, the effect of the weathering test is made more sensitive by the addition of the bending of the specimen at cold temperature.
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5.1 Preformed tape sealants are tacky, deformable solids that are used under compression between two substrates in a variety of sealing applications. This procedure is not intended to simulate an actual use condition, but it will give some indication of the flexibility and adhesion of a tape at low temperature. It can serve to differentiate between flexible tapes that can take some movement and those that tend to harden or embrittle on aging and crack or lose adhesion when flexed at low temperature. It will also aid in identifying sealants that have poor flexibility because they are overextended and contain a low level of binder as well as those sealants having binders that will embrittle at low temperature.
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