ASTM C1246-17

Standard Test Method for Effects of Heat Aging on Weight Loss, Cracking, and Chalking of Elastomeric Sealants After Cure

SIGNIFICANCE AND USE
5.1 Weight loss from a sealant after application in a building joint can be detrimental to long term sealant durability. A sealant's service life will be shortened if it contains components, critical to its durability, that are volatilized by high environmental temperatures. Also, development of cracks and chalking lessens a sealant's service life.  
5.2 The test described herein measures weight loss, cracking, and chalking. The amount of weight lost during the heat aging period and any cracking or chalking helps predict premature sealant failure. However, a sealant developing no cracks or chalking, or low weight loss in this test, does not necessarily ensure good durability.
SCOPE
1.1 This test method covers a laboratory procedure for determining the effects of heat aging on weight loss, cracking and chalking of elastomeric joint sealants (single and multicomponent) for use in building construction.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 The committee having jurisdiction for this specification is not aware of any similar ISO standard.  
1.4 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.  
1.5 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.

General Information

• Status: Historical
• Publication Date: 31-May-2017
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.20 - General Test Methods

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C1246 − 17
Standard Test Method for
Effects of Heat Aging on Weight Loss, Cracking, and
1
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 706 2°C (158 6 3.6°F). The
1.2 The values stated in SI units are to be regarded as the
percentage weight lost during the heat aging period is then
standard. The values given in parentheses are for information
determinedandexaminationismadeforpresenceofcracksand
only.
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 and health practices and determine the applica-
components, critical to its durability, that are volatilized by
bility 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-
5.2 The test described herein measures weight loss,
ization established in the Decision on Principles for the
cracking, and chalking. The amount of weight lost during the
Development of International Standards, Guides and Recom-
heat aging period and any cracking or chalking helps predict
mendations issued by the World Trade Organization Technical
premature sealant failure. However, a sealant developing no
Barriers to Trade (TBT) Committee.
cracks or chalking, or low weight loss in this test, does not
necessarily ensure good durability.
2. Referenced Documents
2
2.1 ASTM Standards: 6. Apparatus
C717 Terminology of Building Seals and Sealants
6.1 Forced-Draft Oven, controlled at 70 6 2°C (158 6
E691 Practice for Conducting an Interlaboratory Study to
3.6°F).
Determine the Precision of a Test Method
6.2 Balance, sensitive to 0.01 g.
3. Terminology
6.3 Rectangular Brass or TFE-Fluorocarbon Frame, with
1 1
3.1 Definitions—Definitions of the following terms are
inside dimensions 130 by 40 by 3.2 mm (5 by 1 ⁄2 by ⁄8 in.).
found in Terminology C717: cure, elastomeric, joint, sealant,
6.4 Aluminum Panels, three, each 152 by 80 by 0.6 to 1.6
self-leveling sealant, standard conditions.
mm (24 to 16 gage) (6 by 3 by 0.024 to 0.0625 in.).
6.5 Straight Edge, metal or plastic, about 152 mm (6 in.)
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
long.
Seals and Sealants and is the direct responsibility of C24.20 on General Test
Methods.
6.6 Thin Knife Blade.
Current edition approved June 1, 2017. Published June 2017. Originally
6.7 Spatula, steel, about 152 mm (6 in.) long.
approved in 1993. Last previous edition approved in 2012 as C1246 – 00(2012).
DOI: 10.1520/C1246-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7. Procedure
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
7.1 Unless otherwise specified by those authorizing the test,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. standard conditions shall be used.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1246 − 17
7.2 Test of Multicomponent Sealants: 8.1.2 Description of the type of sealant, such as single or
7.2.1 Condition at least 400 g of base compound and multicomponent, nonsag or self-leveling, color, etc.
appropriate amount of curing agent in closed containers for at 8.1.3 The percent weight losses during heat aging, % WL ,
ha
least 24 h at standard conditions; then mix thoroughly together of
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C1246 − 00 (Reapproved 2012) C1246 − 17
Standard Test Method for
Effects of Heat Aging on Weight Loss, Cracking, and
1
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
1.1 This test method covers a laboratory procedure for determining the effects of heat aging on weight loss, cracking and
chalking of elastomeric joint sealants (single and multicomponent) for use in building construction.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 The committee having jurisdiction for this specification is not aware of any similar ISO standard.
1.4 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.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C717 Terminology of Building Seals and Sealants
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions—Definitions of the following terms are found in Terminology C717: cure, elastomeric, joint, sealant,
self-leveling sealant.sealant, standard conditions.
4. Summary of Test Method
4.1 Sealant is spread on three aluminum panels and the net weight of sealant on each panel is determined. After the three sealant
specimens are allowed to cure for 28 days at standard conditions, two specimens are then heat-aged for 21 days in a forced-draft
oven maintained at 706 2°C (158 6 3.6°F). The percentage weight lost during the heat aging period is then determined and
examination is made for presence of cracks and chalking.
5. Significance and Use
5.1 Weight loss from a sealant after application in a building joint can be detrimental to long term sealant durability. A sealant’s
service life will be shortened if it contains components, critical to its durability, that are volatilized by high environmental
temperatures. Also, development of cracks and chalking lessens a sealant’s service life.
5.2 The test described herein measures weight loss, cracking, and chalking. The amount of weight lost during the heat aging
period and any cracking or chalking helps predict premature sealant failure. However, a sealant developing no cracks or chalking,
or low weight loss in this test, does not necessarily ensure good durability.
1
This test method is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of C24.20 on General Test Methods.
Current edition approved June 1, 2012June 1, 2017. Published July 2012June 2017. Originally approved in 1993. Last previous edition approved in 20062012 as
C1246 – 00(2006).(2012). DOI: 10.1520/C1246-00R12.10.1520/C1246-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1246 − 17
6. Apparatus
6.1 Forced-Draft Oven, controlled at 70 6 2°C (158 6 3.6°F).
6.2 Balance, sensitive to 0.01 g.
1 1
6.3 Rectangular Brass or TFE-Fluorocarbon Frame, with inside dimensions 130 by 40 by 3.2 mm (5 by 1 ⁄2 by ⁄8 in.).
6.4 Aluminum Panels, three, each 152 by 80 by 0.6 to 1.6 mm (24 to 16 gage) (6 by 3 by 0.024 to 0.0625 in.).
6.5 Straight Edge, metal or plastic, about 152 mm (6 in.) long.
6.6 Thin Knife Blade.
6.7 Spatula, steel, about 152 mm (6 in.) long.
7. Procedure
7.1 Unless otherwise specified by those authorizing the test, standard conditions of temperature and re
...