ASTM D4688-99 (2005) Standard Test Method for Evaluating Structural Adhesives for Finger Jointing Lumber
This test method is specifically designed to measure the performance of adhesives in finger joints manufactured under production line conditions. 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 will be in a structural glued laminated timber. When the test results are to be used for certification of an adhesive for this purpose, use a standard wood species and a standard finger profile. Standard species may be found in Table 1 of Specification D2559.
In this test, a 23KN tensile testing machine and a pair of wedge grip are used.
Important: According to this standard, failure mode of tested specimen must be specified and clarified. We can provide a camera module for filming and photography to determine how the material fails and to record and document the result.