Basic Tests for Plywood

A new test for determining the strength of bond of ply wood is described. The glued area between two notches is subjected to torsion shear by a load applied by hand, and bonding strength is measured by the percentage of wood failure. It is shown that stiffness and puncture resistance are the most important physical properties desired in structural plywood. An apparatus is described which measures glue bond, stiffness, and puncture resistance of plywood.

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