How Wax and Particle Shape Affect Stability and Strength of Oak Particle Boards

This study was made to determine the effect of particle shape and inclusion of wax on the dimensional changes in particle boards conditioned to constant weight at various relative humidities; also to consider the effect of different particle shapes on strength properties, and to determine the amount of fines produced. Test results showed that the boards made with 1-inch-long flakes were the strongest in all respects and the most stable linearly; other boards, in order of strength, were from 1/4-inch-long flakes, planer shavings, slivers, fines, and sawdust. The addition of 1 percent wax to the boards had no appreciable effect on dimensional stability or on strength; however, it greatly retarded the rate of liquid water absorption. The dimensional stability of oak plywood made from the same log was only slightly better than the dimensional stability of particle board made from 1-inch-long flakes; the oak plywood was about twice as strong and stiff in the face grain direction, but 25 percent lower in tension normal to the surface. The 1-inch-long flake was the best form and size used in this investigation.

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