ASTM C961-15
(Test Method)Standard Test Method for Lap Shear Strength of Sealants
Standard Test Method for Lap Shear Strength of Sealants
SIGNIFICANCE AND USE
5.1 Sealants are generally subjected to longitudinal and lateral shear stresses in end use applications. This test method measures the cohesive strength of sealants when subjected to shear stresses, and also provides information regarding the adhesive bond to the substrates being tested.
SCOPE
1.1 This test method covers a laboratory procedure for determining the lap shear strength of sealants. It also provides information on the adhesive bond of the sealants to the tested substrates.
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 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.
1.4 The subcommittee with jurisdiction of this standard is not aware of any similar or equivalent ISO standard.
General Information
Relations
Buy Standard
Standards Content (Sample)
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: C961 − 15
Standard Test Method for
1
Lap Shear Strength of Sealants
This standard is issued under the fixed designation C961; 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 5. Significance and Use
5.1 Sealants are generally subjected to longitudinal and
1.1 This test method covers a laboratory procedure for
lateral shear stresses in end use applications. This test method
determining the lap shear strength of sealants. It also provides
measures the cohesive strength of sealants when subjected to
information on the adhesive bond of the sealants to the tested
shear stresses, and also provides information regarding the
substrates.
adhesive bond to the substrates being tested.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
6. Apparatus
only.
6.1 Sealant Applicator or Oven, capable of maintaining the
1.3 This standard does not purport to address all of the
sealant within 62.8°C (65°F) of the specified temperature.
safety concerns, if any, associated with its use. It is the
6.2 Substrates, of annealed glass that are 25.4 mm wide by
responsibility of the user of this standard to establish appro-
76.2 mm long and 6.35 mm thick (1 by 3 by 0.25 in.). Other
priate safety and health practices and determine the applica-
substrates may be used when specified (Fig. 1).
bility of regulatory limitations prior to use.
1
6.3 Template, to provide 3.18-mm ( ⁄8-in.) sealant thickness
1.4 The subcommittee with jurisdiction of this standard is
(Fig. 2).
not aware of any similar or equivalent ISO standard.
6.4 Hot Knife or Spatula.
2. Referenced Documents
6.5 Tension Testing Machine, capable of pulling a specimen
2
2.1 ASTM Standards:
at a rate of 12.7 mm (0.5 in.)/min.
C717 Terminology of Building Seals and Sealants
7. Sampling
3. Terminology
7.1 Sealant shall be free of external surface contaminants
such as talc, oil, dust, and moisture. Handling of the sealant
3.1 Definitions—Refer to Terminology C717 for definitions
surfaces in contact with the substrate shall be minimized.
of the following terms used in this test method: adhesive
failure, cohesive failure, sealant, standard conditions, and
7.2 A 1.0-kg (2.2-lb) representative sample shall be taken
substrate.
from bulk stock for testing.
4. Summary of Test Method 8. Test Specimens
8.1 Prepare six test specimens from the bulk sample by
4.1 The sealant is placed between two glass substrates. The
using the applicator or the oven method.
sample is placed in a tensile tester and pulled at a constant rate
8.1.1 Applicator Method:
to failure. The maximum shear force and mode of failure is
8.1.1.1 Clean the substrate surface with soap and water
noted. Maximum shear stress is calculated and reported.
followed by a water rinse and solvent wipe with methyl ethyl
ketone (MEK).
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding NOTE 1—At the request of the sealant manufacturer, an alternative
Seals and Sealants and is the direct responsibility of Subcommittee C24.30 on cleaning procedure may be used.
Adhesion.
8.1.1.2 Using an appropriate die or nozzle, apply a 25.4 by
Current edition approved Dec. 1, 2015. Published January 2015. Originally
25.4-mm (1 by 1-in.) layer of sealant onto one end of the
approved in 1981. Last previous edition approved in 2011 as C961–06(2011). DOI:
10.1520/C0961-15.
substrate surface at a thickness that when compressed will
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
comply with 8.1.1.4. Substrates shall be at standard conditions.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Apply the sealant at the specified temperature 62.8°C (65°F)
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. (Fig. 1).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C961 − 15
10. Procedure
10.1 Attach each specimen to the jaws of the tension testing
machine and separate at a crosshead speed of 12.7 mm (0.5
in.)/min to failure (separation) (Fig. 4). Align the testing
machine jaws to prevent cocking of test assembly.
10.2 Visually inspect and record the mode of bond failure
(cohesiveoradhesive)andtheapproximatepercentageofeach.
10.3 Observe and record the maximum shear force in
newtons (or p
...
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: C961 − 06 (Reapproved 2011) C961 − 15
Standard Test Method for
1
Lap Shear Strength of Sealants
This standard is issued under the fixed designation C961; 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 lap shear strength of sealants. It also provides
information on the adhesive bond of the sealants to the tested substrates.
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 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.
1.4 The subcommittee with jurisdiction of this standard is not aware of any similar or equivalent ISO standard.
2. Referenced Documents
2
2.1 ASTM Standards:
C717 Terminology of Building Seals and Sealants
3. Terminology
3.1 Definitions—The Refer to Terminology C717 for definitions of the following terms used in this test method are found in
Terminology method: C717, 4.1: adhesive failure, cohesive failure, sealant, standard conditions, and substrate.
4. Summary of Test Method
4.1 The sealant is placed between two glass substrates. The sample is placed in a tensile tester and pulled at a constant rate to
failure. The maximum shear force and mode of failure is noted. Maximum shear stress is calculated and reported.
5. Significance and Use
5.1 Sealants are generally subjected to longitudinal and lateral shear stresses in end use applications. This test method measures
the cohesive strength of sealants when subjected to shear stresses, and also provides information regarding the adhesive bond to
the substrates being tested.
6. Apparatus
6.1 Sealant Applicator or Oven, capable of maintaining the sealant within 62.8°C (65°F) of the specified temperature.
6.2 Substrates, of annealed glass that are 25.4 mm wide by 76.2 mm long and 6.35 mm thick (1 by 3 by 0.25 in.). Other
substrates may be used when specified (Fig. 1).
1
6.3 Template, to provide 3.18-mm ( ⁄8-in.) sealant thickness (Fig. 2).
6.4 Hot Knife or Spatula.
6.5 Tension Testing Machine, capable of pulling a specimen at a rate of 12.7 mm (0.5 in.)/min.
7. Sampling
7.1 Sealant shall be free of external surface contaminants such as talc, oil, dust, and moisture. Handling of the sealant surfaces
in contact with the substrate shall be minimized.
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 Dec. 1, 2011Dec. 1, 2015. Published January 2012January 2015. Originally approved in 1981. Last previous edition approved in 20062011 as
C961C961–06(2011).–06. DOI: 10.1520/C0961-06R11.10.1520/C0961-15.
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 ----------------------
C961 − 15
Length
Dimension mm in.
G, J 76.2 ± 0.25 (3.00± 0.01)
H, K, M 25.4 ± 0.25 (1.00 ± 0.01)
I, L 6.35 ± 0.10 (0.250± 0.004)
FIG. 1 Assembly of Test Sealant on Substrates
7.2 A 1.0-kg (2.2-lb) representative sample shall be taken from bulk stock for testing.
8. Test Specimens
8.1 Prepare six test specimens from the bulk sample by using the applicator or the oven method.
8.1.1 Applicator Method:
8.1.1.1 Clean the substrate surface with soap and water followed by a water rinse and solvent wipe with methyl ethyl ketone
(MEK).
NOTE 1—At the request of the sealant manufacturer, an alternative cleaning procedure may be used.
8.1.1.2 Using an appropriate die or nozzle, apply a 25.4 by 25.4-mm (1 by 1-in.) layer of sealant onto one end of the substrate
surface at a thickness that when compressed will comply with 8.1.1.4. Substrates shall be at a temperature of 23 6 2°C, 50 6 10 %
relative humidity (73.4 6 3.6°F). standard condi
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.