ASTM C792-15
(Test Method)Standard Test Method for Effects of Heat Aging on Weight Loss, Cracking, and Chalking of Elastomeric Sealants
Standard Test Method for Effects of Heat Aging on Weight Loss, Cracking, and Chalking of Elastomeric Sealants
SIGNIFICANCE AND USE
5.1 Weight loss through volatilization of components of a sealant in a building joint may affect sealant appearance because of shrinkage and sealant performance because of the loss of functional sealant components. Exposure to high-temperature environments will accelerate the loss of volatiles.
5.2 This test method measures weight loss. It can be used in combination with a knowledge of sealant density to estimate shrinkage. In addition, when compared to sealant theoretical weight solids, it provides an estimate of the extent to which functional sealant components can be volatilized when exposed to high service temperatures. Substantial losses of this type may help predict early failures in durability. Also, development of cracks or chalking, or both, lessens sealant service life. However, a sealant that develops no cracks or chalking, or low weight loss in this test method, does not necessarily assure 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 cured-in-place elastomeric joint sealants (single- and multicomponent) for use in building construction.
1.2 This standard does not purport to address all of the safety problems, 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.
1.3 There is no known ISO equivalent to this test method.
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Designation: C792 − 15
Standard Test Method for
Effects of Heat Aging on Weight Loss, Cracking, and
1
Chalking of Elastomeric Sealants
This standard is issued under the fixed designation C792; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 5. Significance and Use
1.1 This test method covers a laboratory procedure for
5.1 Weight loss through volatilization of components of a
determining the effects of heat aging on weight loss, cracking,
sealant in a building joint may affect sealant appearance
and chalking of cured-in-place elastomeric joint sealants
because of shrinkage and sealant performance because of the
(single- and multicomponent) for use in building construction.
loss of functional sealant components. Exposure to high-
temperature environments will accelerate the loss of volatiles.
1.2 This standard does not purport to address all of the
safety problems, if any, associated with its use. It is the
5.2 This test method measures weight loss. It can be used in
responsibility of the user of this standard to establish appro-
combination with a knowledge of sealant density to estimate
priate safety and health practices and determine the applica-
shrinkage. In addition, when compared to sealant theoretical
bility of regulatory limitations prior to use.
weight solids, it provides an estimate of the extent to which
1.3 There is no known ISO equivalent to this test method.
functionalsealantcomponentscanbevolatilizedwhenexposed
to high service temperatures. Substantial losses of this type
2. Referenced Documents
mayhelppredictearlyfailuresindurability.Also,development
2
2.1 ASTM Standards:
of cracks or chalking, or both, lessens sealant service life.
C717 Terminology of Building Seals and Sealants
However, a sealant that develops no cracks or chalking, or low
weight loss in this test method, does not necessarily assure
3. Terminology
good durability.
3.1 Definitions—See Terminology C717 for definitions of
6. Apparatus
the following terms used in this test method: compound,
elastomeric, non-sag sealant, sealant, and self-leveling sealant.
6.1 Forced-Draft Oven, controlled at 70 6 2°C (158 6
3.6°F).
4. Summary of Test Method
6.2 Balance, sensitive to 0.01 g.
4.1 Three sealant specimens are spread on thin aluminum
plates and, after determining net weights of sealant, are cured
6.3 Rectangular Brass Frame, with inside dimensions 130
1 1
for 7 days at Standard Conditions. Immediately following this
by 40 by 6.4 mm (5 by 1 ⁄2 by ⁄4 in.).
initial cure time two specimens are exposed in a forced-draft
6.4 Aluminum Plates, three, each 152 by 80 by 0.6 to 1.6
oven maintained at 70 6 2°C (1586 3.6°F) for 21 days.At the
mm (24 to 16 gage).
end of this exposure the percentage weight loss of the sealant
is determined and examination is made for presence of cracks
6.5 Straightedge, metal or plastic, about 152 mm (6 in.)
and chalking.
long.
6.6 Thin Knife Blade.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding 6.7 Spatula, steel, about 152 mm (6 in.) long.
Seals and Sealants and is the direct responsibility of Subcommittee C24.20 on
General Test Methods.
7. Procedure
Current edition approved March 15, 2015. Published April 2015. Originally
approvedin1975.Lastpreviouseditionapprovedin2008asC792 – 04(2008).DOI:
7.1 Unless otherwise specified by those authorizing the test,
10.1520/C0792-15.
2 standard conditions of temperature and relative humidity for
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
the test shall be found in Terminology C717.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 7.2 Test of Multicomponent Sealants:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C792 − 15
7.2.1 Condition at least 400 g of base compound and 7.3 Test of Single-Component Sealants:
appropriate amount of curing agent in a closed container for at
7.3.1 Condition at least 400 g of compound in a closed
least 24 h at standard conditions; then mix thoroughly for 5
container for at least 24 h at standard conditions.
min.
7.3.2 Follow the same procedure as specified in 7.2.1 –
7.2.2 Weigh the three aluminum plates to the nearest 0.01 g.
7.2.6, eliminating the mixing necessary for multicomponent
7.2.3 Fill the rectangular frame, after centering it on an
sealant
...
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: C792 − 04 (Reapproved 2008) C792 − 15
Standard Test Method for
Effects of Heat Aging on Weight Loss, Cracking, and
1
Chalking of Elastomeric Sealants
This standard is issued under the fixed designation C792; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
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 cured-in-place elastomeric joint sealants (single- and multicomponent) for use in building construction.
1.2 This standard does not purport to address all of the safety problems, 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.
1.3 There is no known ISO equivalent to this test method.
2. Referenced Documents
2
2.1 ASTM Standards:
C717 Terminology of Building Seals and Sealants
3. Terminology
3.1 Definitions—See Terminology C717 for definitions of the following terms used in this test method: compound, elastomeric,
non-sag sealant, sealant, and self-leveling sealant.
4. Summary of Test Method
4.1 Three sealant specimens are spread on thin aluminum plates and, after determining net weights of sealant, are cured for 7
days at 23 6 2°C (74 6 3.6°F) and 50 6 5 % relative humidity. Standard Conditions. Immediately following this initial cure time
two specimens are exposed in a forced-draft oven maintained at 70 6 2°C (1586 3.6°F) for 21 days. At the end of this exposure
the percentage weight loss of the sealant is determined and examination is made for presence of cracks and chalking.
5. Significance and Use
5.1 Weight loss through volatilization of components of a sealant in a building joint may affect sealant appearance because of
shrinkage and sealant performance because of the loss of functional sealant components. Exposure to high-temperature
environments will accelerate the loss of volatiles.
5.2 This test method measures weight loss. It can be used in combination with a knowledge of sealant density to estimate
shrinkage. In addition, when compared to sealant theoretical weight solids, it provides an estimate of the extent to which functional
sealant components can be volatilized when exposed to high service temperatures. Substantial losses of this type may help predict
early failures in durability. Also, development of cracks or chalking, or both, lessens sealant service life. However, a sealant that
develops no cracks or chalking, or low weight loss in this test method, does not necessarily assure good durability.
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
This test method is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.20 on General
Test Methods.
Current edition approved May 1, 2008March 15, 2015. Published June 2008April 2015. Originally approved in 1975. Last previous edition approved in 20042008 as
C792 – 04.C792 – 04(2008). DOI: 10.1520/C0792-04R08.10.1520/C0792-15.
2
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 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 ----------------------
C792 − 15
1 1
6.3 Rectangular Brass Frame, with inside dimensions 130 by 40 by 6.4 mm (5 by 1 ⁄2 by ⁄4 in.).
6.4 Aluminum Plates, three, each 152 by 80 by 0.6 to 1.6 mm (24 to 16 gage).
6.5 Straightedge, 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 relative humidity for the
test shall be 23 6 2°C,found in Terminology C717(73 6 3.6°F) and 50 6 5 %, respectively.
7.2 Test of Multicomponent Sealants:
7.2.1 Condition at least 400 g of base compound and appropriate amount
...
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