ASTM C736-12(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: C736 − 12 (Reapproved 2022)
Standard Test Method for
Extension-Recovery and Adhesion of Latex Sealants
This standard is issued under the fixed designation C736; 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 3. Terminology
3.1 Definitions—Refer to Terminology C717 for definitions
1.1 This test method covers a laboratory procedure for the
of the terms used in this test method.
determination of the extension-recovery and adhesion of latex
sealants.
4. Summary of Test Method
1.2 The values stated in SI units are to be regarded as
4.1 A joint of prescribed dimensions, between glass and
standard. The values given in parentheses after SI units are
aluminum plates is filled with the sealant. After an aging
provided for information only and are not considered standard.
period, the joint width is increased 25 %, the force is removed,
and the specimen is permitted to recover. The amount of
1.3 This standard does not purport to address all of the
recovery and the percent of adhesion loss are measured.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety, health, and environmental practices and deter-
5.1 This test method evaluates the performance of a latex
mine the applicability of regulatory limitations prior to use.
sealant in joints subjected to a limited amount of extension.
NOTE 1—Arelated ISO standard is ISO 7389. Users should compare to
determine how the ISO standard differs from this test method.
6. Apparatus
1.4 This international standard was developed in accor-
6.1 Extension Machine that can be operated at a steady rate
dance with internationally recognized principles on standard-
of12.7mm/min(0.5in./min)andheldatconstantextensionfor
ization established in the Decision on Principles for the
5 min.
Development of International Standards, Guides and Recom-
6.2 Aluminum Alloy Plates, six, anodized, 6.4 mm by 25.4
mendations issued by the World Trade Organization Technical
mm by 76.2 mm ( ⁄4 in. by 1 in. by 3 in.). Plates shall conform
Barriers to Trade (TBT) Committee.
to Guide C1375.
6.3 Glass Plates, six, 6.4 mm by 25.4 mm by 76.2 mm ( ⁄4
2. Referenced Documents
in. by 1 in. by 3 in.). Plates shall conform to Guide C1375.
2.1 ASTM Standards:
6.4 U Shaped Spacers, six, as shown in Fig. 1(a) made of a
C717 Terminology of Building Seals and Sealants
rigid, nonadhering material such as polyethylene, TFE-
C1375 Guide for Substrates Used in Testing Building Seals
fluorocarbon, or release-covered metal.
and Sealants
6.5 Metal C Clamps, twelve.
2.2 ISO Standard:
6.6 Circulating Air Oven, capable of maintaining 50 °C 6 1
ISO 7389 Building Construction–Sealants–Determination of
°C (122 °F 6 2 °F).
Elastic Recovery
7. Sampling
7.1 Take the sealant to be tested directly from the container
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
as commercially supplied by the manufacturer.
Seals and Sealantsand is the direct responsibility of Subcommittee C24.30 on
Adhesion.
8. Test Specimens
Current edition approved Jan. 1, 2022. Published January 2022. Originally
approved in 1972. Last previous edition approved in 2017 as C736 – 12 (2017).
8.1 Prepare a test specimen as follows: Apply a bead of
DOI: 10.1520/C0736-12R22.
1 1
sealant, 12.7 mm by 12.7 mm by 50.8 mm ( ⁄2 in. by ⁄2 in. by
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2 in.) between parallel glass and anodized aluminum plates as
Standards volume information, refer to the standard’s Document Summary page on
shown in Fig. 1(b), using rigid, nonadhering spacer bars. Use
the ASTM website.
the C-clamps to hold the test assembly during the filling and
Available from theAmerican National Standards Institute, 11 W. 42nd St., 13th
Floor, New York, NY 10036. subsequent curing and handling of the specimens.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C736 − 12 (2022)
detergent solution and a final rinse with distilled or deionized water and
then air dried prior to assembly of specimens.
9. Conditioning
9.1 Cure the six test specimens for 7 days at st
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