ASTM D4688 / D4688M - 14

    Standard Test Method for Evaluating Structural Adhesives for Finger Jointing Lumber

    Active Standard ASTM D4688 / D4688M | Developed by Subcommittee: D14.30

    Book of Standards Volume: 15.06


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    Significance and Use

    4.1 This test method is specifically designed to measure the performance of adhesives in finger joints manufactured under production line conditions.

    4.1.1 The test method can be adapted to evaluate the adhesive performance of laboratory produced finger joints using commercial finger joint cutting heads with finger joints produced following the adhesive manufacturers recommendations. The conditions under which the finger joints were produced, including any limitations, are to be reported in 9.1.2.2 (see Note 2).

    Note 2: If laboratory prepared finger joints are to be produced, record details related to adhesive used, its preparation, application to the cut finger joint, appropriate bonding parameters and limitations in the production of the finger joint assemblies.

    4.2 The results of the test method may be used to certify an adhesive as suitable for finger jointing lumber under production line conditions where the intended end use of the finger jointed lumber may be in a variety of bonded structural wood products.

    4.2.1 When the test results are to be used for certification of an adhesive a standard wood species shall be used.

    4.2.1.1 Standard species may be found in Table 1 of Specification D2559.

    1. Scope

    1.1 This test method is designed to evaluate adhesives for finger jointing lumber used in the manufacture of a variety of bonded structural wood products such as structural glued laminated timber. It tests the tensile strength of joints under the following treatments: dry with no treatment, wet after one vacuum-pressure soak treatment, and wet after cyclic boil-dry treatment.

    1.2 This test method is intended neither for quality control as the test assemblies are selected for the absence of defects usually found in run-of-the-mill finger joints nor as a substitute for in-plant qualification of end joints, including full-scale joint tests.

    Note 1: This test method is specifically designed to evaluate adhesives for use in finger jointing lumber using small scale test specimens cut from carefully selected finger joint assemblies. In contrast, plant qualification and quality control require tests of full scale end joints selected randomly from production, designed to evaluate parameters beyond adhesive performance which affect the performance of the end use product.

    1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

    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 and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D907 Terminology of Adhesives

    D2559 Specification for Adhesives for Bonded Structural Wood Products for Use Under Exterior Exposure Conditions

    D5266 Practice for Estimating the Percentage of Wood Failure in Adhesive Bonded Joints

    E4 Practices for Force Verification of Testing Machines


    ICS Code

    ICS Number Code 83.180 (Adhesives)

    UNSPSC Code

    UNSPSC Code 31201601(Chemical adhesives)


    Referencing This Standard

    DOI: 10.1520/D4688_D4688M-14

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D4688 / D4688M-14, Standard Test Method for Evaluating Structural Adhesives for Finger Jointing Lumber, ASTM International, West Conshohocken, PA, 2014, www.astm.org

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