ASTM C1681-18

Standard Test Method for Evaluating the Tear Resistance of a Sealant Under Constant Strain

SIGNIFICANCE AND USE
5.1 This test method is intended to determine if a joint that is subjected to a mechanically induced cut will resist tear propagation during normal joint movement. A sealant with a high resistance to tear propagation will typically perform better than a sealant with a low resistance to tear propagation.
SCOPE
1.1 This test method evaluates the impact of an induced tear on a sealant specimen that is dimensioned, cured according to the guidelines in Test Method C719 and then subjected to a constant strain. It is effective in differentiating between sealants that are used in dynamic joints subject to abrasion, punctures, tears, or combination thereof.  
1.2 Since this test method is for the evaluation of tear propagation, an adhesive failure to the substrates provides no usable data regarding tear propagation. This would be considered a failed test and that data would be discarded, or at least separated from the other data from specimens that did not experience an adhesive failure.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.  
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-Dec-2017
• ICS: 23.040.80 - Seals for pipe and hose assemblies
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C1681 − 18
Standard Test Method for
Evaluating the Tear Resistance of a Sealant Under Constant
1
Strain
This standard is issued under the fixed designation C1681; 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 C719 Test Method for Adhesion and Cohesion of Elasto-
meric Joint Sealants Under Cyclic Movement (Hockman
1.1 This test method evaluates the impact of an induced tear
Cycle)
on a sealant specimen that is dimensioned, cured according to
the guidelines in Test Method C719 and then subjected to a
3. Terminology
constant strain. It is effective in differentiating between seal-
3.1 Definitions—Refer to Terminology C717 for definitions
ants that are used in dynamic joints subject to abrasion,
of terms used in this standard, including but not limited to the
punctures, tears, or combination thereof.
following: adhesive failure, casting spacers, cohesive failure,
1.2 Since this test method is for the evaluation of tear
separators, standard conditions.
propagation, an adhesive failure to the substrates provides no
usable data regarding tear propagation. This would be consid- 4. Summary of Test Method
ered a failed test and that data would be discarded, or at least
4.1 Test specimens are fabricated and cured in accordance
separated from the other data from specimens that did not
with Test Method C719. At the end of the 21-day cure period,
experience an adhesive failure.
an induced tear is created in the specimens by making a cut
1.3 This standard does not purport to address all of the
with a sharp blade in the midpoint of the joint. The specimens
safety concerns, if any, associated with its use. It is the
are then extended to a specified strain at both standard
responsibility of the user of this standard to establish appro-
conditions and at –26 6 2°C (–15 6 3°F). Propagation of the
priate safety, health, and environmental practices and deter-
induced tear is measured at 0, 24 and 168 h.
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
1.4 The committee with jurisdiction over this standard is not
aware of any comparable standards published by other orga-
5.1 This test method is intended to determine if a joint that
nizations.
is subjected to a mechanically induced cut will resist tear
propagation during normal joint movement. A sealant with a
1.5 This international standard was developed in accor-
high resistance to tear propagation will typically perform better
dance with internationally recognized principles on standard-
than a sealant with a low resistance to tear propagation.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
6. Apparatus
mendations issued by the World Trade Organization Technical
6.1 A device capable of extending the test specimens to the
Barriers to Trade (TBT) Committee.
specified strain.
2. Referenced Documents
6.2 Freezer, to maintain a constant temperature of –26°C 6
2
2.1 ASTM Standards: 2°C.
C717 Terminology of Building Seals and Sealants
6.3 A suitable measuring device such as calipers able to
measure the induced tears to 0.01 mm.
6.4 #17 Knife Blade, 9 mm (0.375 in.) wide.
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
7. Reagents and Materials
General Test Methods.
Current edition approved Jan. 1, 2018. Published January 2018. Originally 7.1 Spatulas, for use in applying the sealant.
approved in 2009. Last previous edition approved in 2014 as C1681-14. DOI:
7.2 Caulking Gun, for extruding sealant from cartridges
10.1520/C1681-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or when applicable.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
7.3 Substrates—twelve substrates, with minimum dimen-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. sions of 25 by 75 mm (1 by 3 in.) of the same finish are
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1681 − 18
required for each product to be tested. Glass is the default pound. In the case of a pourable-type compound, use masking
substrate, however as mentioned in the scope, this is not an or any other suitable tape to retain the compound.
adhesion test, therefore the sealant must exhibit excellent
8.2 Clean the test substrates using the methods suggested in
adhesion to
...

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: C1681 − 14 C1681 − 18
Standard Test Method for
Evaluating the Tear Resistance of a Sealant Under Constant
1
Strain
This standard is issued under the fixed designation C1681; 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 evaluates the impact of an induced tear on a sealant specimen that is dimensioned, cured according to the
guidelines in Test Method C719 and then subjected to a constant strain. It is effective in differentiating between sealants that are
used in dynamic joints subject to abrasion, punctures, tears, or combination thereof.
1.2 Since this test method is for the evaluation of tear propagation, an adhesive failure to the substrates provides no usable data
regarding tear propagation. This would be considered a failed test and that data would be discarded, or at least separated from the
other data from specimens that did not experience an adhesive failure.
1.3 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 The committee with jurisdiction over this standard is not aware of any comparable standards published by other
organizations.
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
C719 Test Method for Adhesion and Cohesion of Elastomeric Joint Sealants Under Cyclic Movement (Hockman Cycle)
3. Terminology
3.1 Definitions—Refer to Terminology C717 for definitions of the following terms used in this test method: casting
spacer.standard, including but not limited to the following: adhesive failure, casting spacers, cohesive failure, separators, standard
conditions.
3.2 separators—rigid spacers used to maintain a constant strain on the joint specimens during the testing period while
maintaining parallel bond surfaces.
4. Summary of Test Method
4.1 Test specimens are fabricated and cured in accordance with Test Method C719. At the end of the 21-day cure period, an
induced tear is created in the specimens by making a cut with a sharp blade in the midpoint of the joint. The specimens are then
extended to a specified strain at both standard conditions and at –26 6 2°C (–15 6 3°F). Propagation of the induced tear is
measured at 0, 24 and 168 h.
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 June 1, 2014Jan. 1, 2018. Published July 2014January 2018. Originally approved in 2009. Last previous edition approved in 20092014 as
C1681-09.-14. DOI: 10.1520/C1681-14.10.1520/C1681-18.
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 ----------------------
C1681 − 18
5. Significance and Use
5.1 This test method is intended to determine if a joint that is subjected to a mechanically induced cut will resist tear propagation
during normal joint movement. A sealant with a high resistance to tear propagation will typically perform better than a sealant with
a low resistance to tear propagation.
6. Apparatus
6.1 A device capable of extending the test specimens to the specified strain.
6.2 Freezer, to maintain a constant temperature of –26°C 6 2°C.
6.3 A suitable measuring device such as calipers able to measure the induced tears to 0.01 mm.
3
6.4 #17 Knife Blade, 9 mm ((0.375 ⁄8 in.) wide.
7. Reagents and Materials
7.1 Spatulas, for use in applying the sealant.
7.2 Caulking Gun, for
...