ASTM D7247-06
(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
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 . 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 D 905. 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 While it is preferable to use solid wood specimens as described in Section as the control, structural composite lumber products as defined in Specification D 5456 shall be permitted for use provided they are matched with the bonded specimens in accordance with Section and the ignition temperature is not significantly lower than solid wood of the same species.
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.
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.
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Designation:D7247–06
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 D 7247; 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 (e) 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, such as the fire hazard, associated with its use.
1.1 This standard describes a test method for evaluating the
It is the responsibility of the user of this standard to establish
comparative shear strength of a planar adhesive bond at both
appropriate safety and health practices and determine the
ambient and elevated temperatures relative to the performance
applicability of regulatory limitations prior to use.
of solid wood under the same conditions. The test method is
based on the breaking load after the specimen is exposed to
2. Referenced Documents
either ambient or a constant elevated temperature for a speci-
2
2.1 ASTM Standards:
fied duration as described in Section 7. This standard does not
D 905 Test Method for Strength Properties of Adhesive
preclude the development and implementation of other meth-
Bonds in Shear by Compression Loading
ods that provide equivalent performance meeting the intent of
D 907 Terminology of Adhesives
this method.
D 2395 Test Methods for Specific Gravity of Wood and
1.2 This test method is intended for the evaluation of
Wood-Based Materials
adhesives that can be used to assemble test specimens in
D 2915 Practice for Evaluating Allowable Properties for
accordance with Test Method D 905. The evaluation of other
Grades of Structural Lumber
types of adhesives, such as the binder systems used for
D 4933 Guide for Moisture Conditioning of Wood and
strand-based products, is beyond the scope of this test method.
Wood-Based Materials
1.3 This test method is intended for the evaluation of
D 5266 Practice for Estimating the Percentage of Wood
adhesives as a component of laminated wood products at
Failure in Adhesive Bonded Joints
elevated temperatures. The evaluation of fire performance on
D 5456 Specification for Evaluation of Structural Compos-
fire-rated laminated wood products or assemblies is beyond the
ite Lumber Products
scope of this test method.
2.2 Other Documents:
1.4 While it is preferable to use solid wood specimens as
ANSI/AITCA190.1 American National Standard for Wood
described in Section 6 as the control, structural composite
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Products — Structural Glued Laminated Timber
lumber products as defined in Specification D 5456 shall be
ANSI/AF&PANDS-2005 National Design — Specification
permitted for use provided they are matched with the bonded
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for Wood Construction (NDS)
specimens in accordance with Section 6 and the ignition
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Wood Handbook Wood as an Engineering Material
temperature is not significantly lower than solid wood of the
same species.
3. Terminology
1.5 The exact formulation of adhesive supplied to the
3.1 Definitions:
manufacturer of laminated wood products shall be evaluated.
3.1.1 Many terms in this test method are defined in Termi-
Modifications to the adhesive formulation require a separate
nology D 907.
evaluation unless approved by the manufacturer of the lami-
nated 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
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
only.
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.
1 3
This test method is under the jurisdiction of ASTM Committee D14 on Available from American Institute of Timber Construction (AITC), 7012 S.
Adhesives and is the direct responsibility of Subcommittee D14.30 on Wood Revere Parkway, Suite 140, Centennial, CO 80112.
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Adhesives. AvailablefromU.S.DepartmentofAgriculture,ForestService,ForestProducts
Current edition approved June 15, 2006. Published July 2006. Laboratory, One Gifford Pinchot Drive Madison, Wisconsin 53726.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D7247–06
4. Significance and Use A190.1 shall be permitted to be grouped for the purpose of this
test method. Nominal 2-in. thick lumber shall be used to
4.1 A discussion of the issues associated with the measure-
manufacture the test specimens. The lumber shall have the
ment of strength propert
...
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