A New Method for Evaluation of Internal Strength of Particleboard

A good relationship exists between torsion shear and internal-bond strength for 53 Canadian-made commercial particleboards. This relationship is independent of specimen sizes between 2 and 1/2-inch square and is applicable to particleboards with internal bond strengths up to 350 psi. A 1-inch square specimen seems the most practical size for testing particleboards thicker than 1/4-inch. For panels 1/4-inch thick or less, it may be necessary to laminate three specimens together prior to testing. The torsion-shear technique is simple, rapid, reliable, and economical. The low cost of the test equipment (about $60 for a precision torque wrench and two sockets) may be of interest to particleboard users who are not equipped with a conventional testing machine.

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