A Rapid Accelerated-Aging Test Procedure for Phenolic Particleboard

An assessment was made of the German standard accelerated-aging test for the retention of internal bond strength in phenolic particleboard which has been boiled for 2 hours. It was found that this technique was not applicable to boards made with thick and large flakes, because of the nonuniform swelling which boiling produces in small specimens of this type of board. A torsion-shear technique was found to be applicable, since it is unaffected by nonuniform swelling in the test specimen. Close correlations were found between torsion-shear strength and internal bond strength of both dry and boiled specimens for 10 phenolic resin bonded particleboards of laboratory and commercial origin. The torsion-shear technique is simpler and faster than the conventional procedure based on an internal-bond measurement, and this modification of the German standard accelerated-aging procedure reduces the total test time to less than 3 hours. This fulfills the need for a test which is quick enough to be of maximum value for quality control, yet is sensitive enough to manufacturing changes.

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