ASTM D7247-17
(Test Method)Standard Test Method for Evaluating the Shear Strength of Adhesive Bonds in Laminated Wood Products at Elevated Temperatures
Standard Test Method for Evaluating the Shear Strength of Adhesive Bonds in Laminated Wood Products at Elevated Temperatures
SIGNIFICANCE AND USE
4.1 A discussion of the issues and limitations associated with the measurement of strength properties of adhesive bonds in shear by compression loading is found in Test Method D905.
4.2 While various combinations of test temperature and heat exposure duration can be used, the provisions specified in 7.2.4 shall be based on the understanding that the objective of this test method is to evaluate adhesive bond performance just before wood begins to burn and the elevated temperature is selected to be slightly below the unpiloted ignition temperature for wood when taken into account the specific product and its end-use applications.
4.3 When using this test method, consideration shall be given to the unique production conditions, such as wood moisture content, applied spread rate, press pressure, and curing temperature of the adhesive.
SCOPE
1.1 This standard describes a test method for evaluating the comparative shear strength of a planar adhesive bond at both ambient and elevated temperatures relative to the performance of solid wood under the same conditions. The test method is based on the breaking load after the specimen is exposed to either ambient or a constant elevated temperature for a specified duration as described in Section 7. This standard does not preclude the development and implementation of other methods that provide equivalent performance meeting the intent of this method.
1.2 This test method is intended for the evaluation of adhesives that can be used to assemble test specimens in accordance with Test Method D905. The evaluation of other types of adhesives, such as the binder systems used for strand-based products, is beyond the scope of this test method, except as noted in 1.4.
1.3 This test method is intended for the evaluation of adhesives as a component of laminated wood products at elevated temperatures. The evaluation of fire performance on fire-rated laminated wood products or assemblies is beyond the scope of this test method.
1.4 This test method may be used for the evaluation of heat durability for binder adhesives used in strand-based structural wood composites, such as oriented strand lumber (OSL) and laminated strand lumber (LSL), by substituting strand-based composite specimens for the bonded specimens.
1.5 The formulation of adhesive supplied to the manufacturer of laminated wood products shall be evaluated. Modifications to the adhesive formulation require a separate evaluation unless approved by the manufacturer of the laminated wood product, qualified agency, and code evaluation agency.
1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.7 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.
1.8 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.
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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: D7247 − 17
Standard Test Method for
Evaluating the Shear Strength of Adhesive Bonds in
1
Laminated Wood Products at Elevated Temperatures
This standard is issued under the fixed designation D7247; 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 1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This standard describes a test method for evaluating the
responsibility of the user of this standard to establish appro-
comparative shear strength of a planar adhesive bond at both
priate safety, health, and environmental practices and deter-
ambient and elevated temperatures relative to the performance
mine the applicability of regulatory limitations prior to use.
of solid wood under the same conditions. The test method is
1.8 This international standard was developed in accor-
based on the breaking load after the specimen is exposed to
dance with internationally recognized principles on standard-
either ambient or a constant elevated temperature for a speci-
ization established in the Decision on Principles for the
fied duration as described in Section 7. This standard does not
Development of International Standards, Guides and Recom-
preclude the development and implementation of other meth-
mendations issued by the World Trade Organization Technical
ods that provide equivalent performance meeting the intent of
Barriers to Trade (TBT) Committee.
this method.
1.2 This test method is intended for the evaluation of
2. Referenced Documents
adhesives that can be used to assemble test specimens in
2
accordance with Test Method D905. The evaluation of other 2.1 ASTM Standards:
types of adhesives, such as the binder systems used for
D905 Test Method for Strength Properties of Adhesive
strand-based products, is beyond the scope of this test method, Bonds in Shear by Compression Loading
except as noted in 1.4.
D907 Terminology of Adhesives
D2395 TestMethodsforDensityandSpecificGravity(Rela-
1.3 This test method is intended for the evaluation of
tive Density) of Wood and Wood-Based Materials
adhesives as a component of laminated wood products at
D2915 Practice for Sampling and Data-Analysis for Struc-
elevated temperatures. The evaluation of fire performance on
tural Wood and Wood-Based Products
fire-rated laminated wood products or assemblies is beyond the
D4933 Guide for Moisture Conditioning of Wood and
scope of this test method.
Wood-Based Materials
1.4 This test method may be used for the evaluation of heat
D5266 Practice for Estimating the Percentage of Wood
durability for binder adhesives used in strand-based structural
Failure in Adhesive Bonded Joints
wood composites, such as oriented strand lumber (OSL) and
D5456 Specification for Evaluation of Structural Composite
laminated strand lumber (LSL), by substituting strand-based
Lumber Products
composite specimens for the bonded specimens.
2.2 Other Documents:
1.5 The formulation of adhesive supplied to the manufac-
ANSI A190.1 American National Standard for Wood Prod-
turer of laminated wood products shall be evaluated. Modifi- 3
ucts — Structural Glued Laminated Timber
cations to the adhesive formulation require a separate evalua-
ANSI/AWCNDS-2015 NationalDesign—Specificationfor
tion unless approved by the manufacturer of the laminated 3
Wood Construction (NDS)
wood product, qualified agency, and code evaluation agency. 4
Wood Handbook Wood as an Engineering Material
1.6 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
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
1
This test method is under the jurisdiction of ASTM Committee D14 on Standards volume information, refer to the standard’s Document Summary page on
Adhesives and is the direct responsibility of Subcommittee D14.30 on Wood the ASTM website.
3
Adhesives. APA — The Engineered Wood Association, 7011 S. 19th St., Tacoma, WA
Current edition approved Oct. 15, 2017. Published November 2017. Originally 98466, www.apaword.org.
4
approved in 2006. Last previous edition approved in 2016 as D7247 – 16. DOI: AvailablefromU.S.DepartmentofAgriculture,ForestService,ForestProducts
10.1520/D7247-17. Laboratory, One Gifford Pinchot Drive Madison, WI 53726, www.fpl.fs.fed.us.
Copyright © ASTM International,
...
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: D7247 − 16 D7247 − 17
Standard Test Method for
Evaluating the Shear Strength of Adhesive Bonds in
1
Laminated Wood Products at Elevated Temperatures
This standard is issued under the fixed designation D7247; 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 standard describes a test method for evaluating the comparative shear strength of a planar adhesive bond at both
ambient and elevated temperatures relative to the performance of solid wood under the same conditions. The test method is based
on the breaking load after the specimen is exposed to either ambient or a constant elevated temperature for a specified duration
as described in Section 7. This standard does not preclude the development and implementation of other methods that provide
equivalent performance meeting the intent of this method.
1.2 This test method is intended for the evaluation of adhesives that can be used to assemble test specimens in accordance with
Test Method D905. The evaluation of other types of adhesives, such as the binder systems used for strand-based products, is
beyond the scope of this test method.method, except as noted in 1.4.
1.3 This test method is intended for the evaluation of adhesives as a component of laminated wood products at elevated
temperatures. The evaluation of fire performance on fire-rated laminated wood products or assemblies is beyond the scope of this
test method.
1.4 This test method may be used for the evaluation of heat durability for binder adhesives used in strand-based structural wood
composites, such as oriented strand lumber (OSL) and laminated strand lumber (LSL), by substituting strand-based composite
specimens for the bonded specimens.
1.5 The exact formulation of adhesive supplied to the manufacturer of laminated wood products shall be evaluated.
Modifications to the adhesive formulation require a separate evaluation unless approved by the manufacturer of the laminated
wood product, qualified agency, and code evaluation agency.
1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.7 This standard does not purport to address all of the safety concerns, such as the fire hazard, 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.
1.8 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:
D905 Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading
D907 Terminology of Adhesives
D2395 Test Methods for Density and Specific Gravity (Relative Density) of Wood and Wood-Based Materials
D2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based Products
D4933 Guide for Moisture Conditioning of Wood and Wood-Based Materials
D5266 Practice for Estimating the Percentage of Wood Failure in Adhesive Bonded Joints
D5456 Specification for Evaluation of Structural Composite Lumber Products
1
This test method is under the jurisdiction of ASTM Committee D14 on Adhesives and is the direct responsibility of Subcommittee D14.30 on Wood Adhesives.
Current edition approved April 1, 2016Oct. 15, 2017. Published April 2016November 2017. Originally approved in 2006. Last previous edition approved in 20072016
ɛ1
as D7247 – 07a which was withdrawn January 2016 and reinstated in April 2016 as D7247 – 16. DOI: 10.1520/D7247-16.10.1520/D7247-17.
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
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D7247 − 17
Note–See Fig. 2 for specimen dimensi
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