ASTM C1246-17(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: C1246 − 17 (Reapproved 2022)
Standard Test Method for
Effects of Heat Aging on Weight Loss, Cracking, and
Chalking of Elastomeric Sealants After Cure
This standard is issued under the fixed designation C1246; 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
4.1 Sealant is spread on three aluminum panels and the net
determining the effects of heat aging on weight loss, cracking
weight of sealant on each panel is determined. After the three
and chalking of elastomeric joint sealants (single and multi-
sealant specimens are allowed to cure for 28 days at standard
component) for use in building construction.
conditions, two specimens are then heat-aged for 21 days in a
forced-draft oven maintained at 70 °C 6 2 °C (158 °F 6 3.6
1.2 The values stated in SI units are to be regarded as the
°F). The percentage weight lost during the heat aging period is
standard. The values given in parentheses are for information
then determined and examination is made for presence of
only.
cracks and chalking.
1.3 The committee having jurisdiction for this specification
is not aware of any similar ISO standard.
5. Significance and Use
1.4 This standard does not purport to address all of the
5.1 Weightlossfromasealantafterapplicationinabuilding
safety concerns, if any, associated with its use. It is the
joint can be detrimental to long term sealant durability. A
responsibility of the user of this standard to establish appro-
sealant’s service life will be shortened if it contains
priate safety, health, and environmental practices and deter-
components, critical to its durability, that are volatilized by
mine the applicability of regulatory limitations prior to use.
high environmental temperatures.Also, development of cracks
1.5 This international standard was developed in accor-
and chalking lessens a sealant’s service life.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5.2 The test described herein measures weight loss,
Development of International Standards, Guides and Recom-
cracking, and chalking. The amount of weight lost during the
mendations issued by the World Trade Organization Technical
heat aging period and any cracking or chalking helps predict
Barriers to Trade (TBT) Committee.
premature sealant failure. However, a sealant developing no
cracks or chalking, or low weight loss in this test, does not
2. Referenced Documents
necessarily ensure good durability.
2.1 ASTM Standards:
C717 Terminology of Building Seals and Sealants
6. Apparatus
E691 Practice for Conducting an Interlaboratory Study to
6.1 Forced-Draft Oven, controlled at 70 °C 6 2 °C (158
Determine the Precision of a Test Method
°F 6 3.6 °F).
3. Terminology
6.2 Balance, sensitive to 0.01 g.
3.1 Definitions—Definitions of the following terms are
6.3 Rectangular Brass or TFE-Fluorocarbon Frame, with
found in Terminology C717: cure, elastomeric, joint, sealant,
inside dimensions 130 mm by 40 mm by 3.2 mm (5 in. by 1 ⁄2
self-leveling sealant, standard conditions.
in. by ⁄8 in.).
6.4 AluminumPanels, three, each 152 mm by 80 mm by 0.6
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
mm to 1.6 mm (24 to 16 gage) (6 in. by 3 in. by 0.024 in. to
Seals and Sealants and is the direct responsibility of C24.20 on General Test
Methods. 0.0625 in.).
Current edition approved Jan. 1, 2022. Published January 2022. Originally
approved in 1993. Last previous edition approved in 2017 as C1246 – 17. DOI: 6.5 Straight Edge, metal or plastic, about 152 mm (6 in.)
10.1520/C1246-17R22.
long.
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
6.6 Thin Knife Blade.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.7 Spatula, steel, about 152 mm (6 in.) long.
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C1246 − 17 (2022)
7. Procedure 8. Report
7.1 Unless otherwise specified by those authorizing the test, 8.1 Reportthefollowinginformationforeachsealanttested:
8.1.1 Identification of the sealant tested.
standard conditions shall be used.
8.1.2 Description of the type of sealant, such as single or
7.2 Test of Multicomponent Sealants:
multicomponent, nonsag or self-leveling, color, etc.
7.2.1 Condition at least 400 g of base compound and
8.1.3 The percent weight losses during heat aging, % WL ,
ha
appropriate amount of curing agent in closed containers for at
of the two hea
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