ASTM C794-18

Standard Test Method for Adhesion-in-Peel of Elastomeric Joint Sealants

SIGNIFICANCE AND USE
5.1 There are differences in opinion among those concerned with sealant technology whether or not this adhesion-in-peel test simulates the type of strain and e-tensile stresses encountered by a sealant in normal use. Nevertheless, this test provides a valuable measurement of the ability of the cured sealant to maintain a bond to the substrate under severe peel conditions.  
5.2 Many sealant manufacturers utilize the adhesion-in-peel test for determining the adhesive characteristics of sealant/primer combinations with unusual or proprietary substrates. This test is especially useful for quality measurements comparing batches of the same sealant relative to adhesion or for studying adhesion of a given sealant to a variety of substrates.  
5.3 This test method alone is not appropriate for comparing the overall performance of different sealants in a given application. The adhesive force that determines if a given sealant is useful in a given application also depends on the modulus of elasticity and the degree to which the sealant will be strained. This test, as it exists, does not consider the modulus of elasticity, nor amount of stress that will be produced by a given strain in an actual sealant in a moving joint. No known correlations are given to relate and apply modulus values to the peel values.  
5.4 This test requires that the results indicate whether the failure mode is primarily adhesive or cohesive. It is important to note that a cohesive failure is not necessarily better than an adhesive failure, if the adhesive value is sufficient for the application. Having adhesive failure allows one to study the change of adhesion with time and with the various stress conditions.
SCOPE
1.1 This test method covers a laboratory procedure for determining the strength and characteristics of the peel properties of a cured-in-place elastomeric joint sealant, single- or multicomponent, for use in building construction.  
1.2 The values stated in metric (SI) units are to be regarded as the standard. The values given in parentheses are provided for information only.  
1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.  
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, health, and environmental 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-Jan-2018
• ICS: 83.060 - Rubber
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.30 - Adhesion

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: C794 − 18
Standard Test Method for
1
Adhesion-in-Peel of Elastomeric Joint Sealants
This standard is issued under the fixed designation C794; 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 3. Terminology
1.1 This test method covers a laboratory procedure for 3.1 For the definitions used in this test method, see Termi-
determining the strength and characteristics of the peel prop- nology C717, standard conditions.
erties of a cured-in-place elastomeric joint sealant, single- or
4. Summary of Test Method
multicomponent, for use in building construction.
1.2 The values stated in metric (SI) units are to be regarded 4.1 This test method consists of preparing test specimens by
embedding a wire mesh screen between two thin layers of the
as the standard. The values given in parentheses are provided
for information only. sealant being tested, on test substrates, curing these specimens
under specified time and conditions, then placing the specimen
1.3 Thecommitteewithjurisdictionoverthisstandardisnot
in a tension-testing machine in such a way that the embedded
aware of any comparable standards published by other orga-
wire mesh screen is peeled back from the substrate at 180°,
nizations.
while measuring the force exerted as well as the mode of
1.4 This standard does not purport to address all of the
failure of the sealant from the substrate.
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 There are differences in opinion among those concerned
mine the applicability of regulatory limitations prior to use.
with sealant technology whether or not this adhesion-in-peel
1.5 This international standard was developed in accor-
test simulates the type of strain and e-tensile stresses encoun-
dance with internationally recognized principles on standard-
tered by a sealant in normal use. Nevertheless, this test
ization established in the Decision on Principles for the
provides a valuable measurement of the ability of the cured
Development of International Standards, Guides and Recom-
sealant to maintain a bond to the substrate under severe peel
mendations issued by the World Trade Organization Technical
conditions.
Barriers to Trade (TBT) Committee.
5.2 Many sealant manufacturers utilize the adhesion-in-peel
2. Referenced Documents
test for determining the adhesive characteristics of sealant/
2
primer combinations with unusual or proprietary substrates.
2.1 ASTM Standards:
This test is especially useful for quality measurements com-
C717 Terminology of Building Seals and Sealants
paring batches of the same sealant relative to adhesion or for
C1375 Guide for Substrates Used in Testing Building Seals
studying adhesion of a given sealant to a variety of substrates.
and Sealants
E177 Practice for Use of the Terms Precision and Bias in
5.3 This test method alone is not appropriate for comparing
ASTM Test Methods
the overall performance of different sealants in a given appli-
E691 Practice for Conducting an Interlaboratory Study to
cation. The adhesive force that determines if a given sealant is
Determine the Precision of a Test Method
useful in a given application also depends on the modulus of
elasticity and the degree to which the sealant will be strained.
This test, as it exists, does not consider the modulus of
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
elasticity, nor amount of stress that will be produced by a given
Seals and Sealants and is the direct responsibility of Subcommittee C24.30 on
Adhesion.
strain in an actual sealant in a moving joint. No known
Current edition approved Feb. 1, 2018. Published March 2018. Originally
correlations are given to relate and apply modulus values to the
approved in 1975. Last previous edition approved in 2015 as C794 – 15a. DOI:
peel values.
10.1520/C0794-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.4 This test requires that the results indicate whether the
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
failure mode is primarily adhesive or cohesive. It is important
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. to note that a cohesive failure is not necessarily better than an
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.
...

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: C794 − 15a C794 − 18
Standard Test Method for
1
Adhesion-in-Peel of Elastomeric Joint Sealants
This standard is issued under the fixed designation C794; 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 strength and characteristics of the peel properties of a
cured-in-place elastomeric joint sealant, single- or multicomponent, for use in building construction.
1.2 The values stated in metric (SI) units are to be regarded as the standard. The values given in parentheses are provided for
information only.
1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by other
organizations.
1.4 This standard does not purport to address all of the safety problems,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.
1.5 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
C1375 Guide for Substrates Used in Testing Building Seals and Sealants
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 For the definitions used in this test method, see Terminology C717, standard conditions.
4. Summary of Test Method
4.1 This test method consists of preparing test specimens by embedding a wire mesh screen between two thin layers of the
sealant being tested, on test substrates, curing these specimens under specified time and conditions, then placing the specimen in
a tension-testing machine in such a way that the embedded wire mesh screen is peeled back from the substrate at 180°, while
measuring the force exerted as well as the mode of failure of the sealant from the substrate.
5. Significance and Use
5.1 There are differences in opinion among those concerned with sealant technology whether or not this adhesion-in-peel test
simulates the type of strain and e-tensile stresses encountered by a sealant in normal use. Nevertheless, this test provides a valuable
measurement of the ability of the cured sealant to maintain a bond to the substrate under severe peel conditions.
1
This test method is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.30 on Adhesion.
Current edition approved July 1, 2015Feb. 1, 2018. Published August 2015March 2018. Originally approved in 1975. Last previous edition approved in 2015 as
C794 – 15.C794 – 15a. DOI: 10.1520/C0794-15A.10.1520/C0794-18.
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 ----------------------
C794 − 18
5.2 Many sealant manufacturers utilize the adhesion-in-peel test for determining the adhesive characteristics of sealant/primer
combinations with unusual or proprietary substrates. This test is especially useful for quality measurements comparing batches of
the same sealant relative to adhesion or for studying adhesion of a given sealant to a variety of substrates.
5.3 This test method alone is not appropriate for comparing the overall performance of different sealants in a given application.
The adhesive force that determines if a given sealant is useful in a given application also depends on the modulus of elasticity and
the degree to which the sealant will be strained. This
...