Deflection in Bending of Birch-Veneered Wood-Base Composite Shelving Panels

Birch plywood has become too expensive for use as high quality shelving in libraries. Fourteen commercial birch veneered wood base panels were tested as possible substitutes. Core materials included Douglas-fir plywood, flakeboard, medium density fiberboard, high density particleboard, laminated pine lumber and birch veneers. Density range was 0.47 to 1.03 g/cm3 and thickness range was 18.0 to 22.2 mm. Shelves were subjected to a bending test under a uniform load of 37kg for 24 hours. Seven of the panels, each with face and back veneer thicknesses greater than 1.0mm, were acceptable substitutes for the 19-mm birch veneer faced Douglas-fir core plywood sheves now in use. Most of the substitutes are thicker and heavier than currently used plywood shelves.

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