The Development of the Glueline-Cleavage Test

ASTM test methods gave inconsistent results when Douglas-fir veneer was tested at the Vancouver Forest Products Laboratory. New test methods gave promising results. The coefficient of variation was reduced from 37.5 percent to 27.2 percent in the case of tension normal to the glueline plywood test; from 25.6 percent to 13.7 percent in the case of tension shear; and from 17.4 percent to 9.6 percent in the case of glueline cleavage. The glueline cleavage test is the most suitable of tension normal to the glue line, tension shear, block shear, and glueline cleavage tests in evaluating the quality of Douglas-fir veneer joints bonded with phenolic resins. There appears to be no correlation between percentage of wood failure and breaking load in well-made phenolic joints.

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