ASTM D7247-16
(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.
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, 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.
General Information
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Standards Content (Sample)
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Designation: D7247 − 16
Standard Test Method for
Evaluating the Shear Strength of Adhesive Bonds in
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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 1.6 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
1.1 This standard describes a test method for evaluating the
only.
comparative shear strength of a planar adhesive bond at both
1.7 This standard does not purport to address all of the
ambient and elevated temperatures relative to the performance
safety concerns, such as the fire hazard, associated with its use.
of solid wood under the same conditions. The test method is
It is the responsibility of the user of this standard to establish
based on the breaking load after the specimen is exposed to
appropriate safety and health practices and determine the
either ambient or a constant elevated temperature for a speci-
applicability of regulatory limitations prior to use.
fied duration as described in Section 7. This standard does not
preclude the development and implementation of other meth-
2. Referenced Documents
ods that provide equivalent performance meeting the intent of
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this method. 2.1 ASTM Standards:
D905 Test Method for Strength Properties of Adhesive
1.2 This test method is intended for the evaluation of
Bonds in Shear by Compression Loading
adhesives that can be used to assemble test specimens in
D907 Terminology of Adhesives
accordance with Test Method D905. The evaluation of other
D2395 TestMethodsforDensityandSpecificGravity(Rela-
types of adhesives, such as the binder systems used for
tive Density) of Wood and Wood-Based Materials
strand-based products, is beyond the scope of this test method.
D2915 Practice for Sampling and Data-Analysis for Struc-
tural Wood and Wood-Based Products
1.3 This test method is intended for the evaluation of
D4933 Guide for Moisture Conditioning of Wood and
adhesives as a component of laminated wood products at
Wood-Based Materials
elevated temperatures. The evaluation of fire performance on
D5266 Practice for Estimating the Percentage of Wood
fire-rated laminated wood products or assemblies is beyond the
Failure in Adhesive Bonded Joints
scope of this test method.
D5456 Specification for Evaluation of Structural Composite
1.4 This test method may be used for the evaluation of heat
Lumber Products
durability for binder adhesives used in strand-based structural
2.2 Other Documents:
wood composites, such as oriented strand lumber (OSL) and
ANSI A190.1 American National Standard for Wood Prod-
laminated strand lumber (LSL), by substituting strand-based
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ucts — Structural Glued Laminated Timber
composite specimens for the bonded specimens.
ANSI/AWCNDS-2015 NationalDesign—Specificationfor
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1.5 The exact formulation of adhesive supplied to the Wood Construction (NDS)
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manufacturer of laminated wood products shall be evaluated.
Wood Handbook Wood as an Engineering Material
Modifications to the adhesive formulation require a separate
evaluation unless approved by the manufacturer of the lami-
3. Terminology
nated wood product, qualified agency, and code evaluation
3.1 Definitions:
agency.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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This test method is under the jurisdiction of ASTM Committee D14 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Adhesives and is the direct responsibility of Subcommittee D14.30 on Wood Standards volume information, refer to the standard’s Document Summary page on
Adhesives. the ASTM website.
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Current edition approved April 1, 2016. Published April 2016. Originally APA — The Engineered Wood Association, 7011 S. 19th St., Tacoma, WA
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approved in 2006. Last previous edition approved in 2007 as D7247 – 07a which 98466, www.apaword.org.
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was withdrawn January 2016 and reinstated in April 2016 as D7247 – 16. DOI: AvailablefromU.S.DepartmentofAgriculture,ForestService,ForestProducts
10.1520/D7247-16. Laboratory, One Gifford Pinchot Drive Madison, WI 53726, www.fpl.fs.fed.us.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7247 − 16
Note–See Fig. 2 for specimen dimension.
FIG. 1 Example of Side-Matched Specimen Fabrication (Using Nominal 2 by 6 in. Lumber with Bonded Specimens and Side-Matched
Solid Wood Control Specimens)
3.1.1 Many terms in this test method are defined in Ter
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