Correlation Between Torsion Shear and Modulus of Rupture of Particleboard

General correlation (r = 0.7) was found between MOR and torsion-shear strength measured with a torque wrench at different planes of 57 commercial particleboards made by seven Canadian manufacturers. These commercial particleboards represented different manufacturing processes, wood species, resin contents, particle geometries, and end uses. Board manufacturer and thickness was found to have considerable influence on the correlation. This correlation was much improved, with correlation coefficient in the order of 0.90, if boards were restricted to either a single manufacturer or a single thickness. Torsion shear measured 1/8-inch below surfaces and at the quarter-point (mid-point between surfaces and center plane) appears to be immaterial as far as correlation is concerned. However, the quarter point measurement is applicable to board of any thicknesses. The results generally support the hypothesis that the shear strength in the outer layers is related to the bending strength of particleboard.

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