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Publication: Forest Products Journal
Authors: Biblis E J
Reference ID: 35(2):28-32
Publish Year: 1985
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Title: Properties of Three-Layer Oriented Strandboard from Southern Hardwoods
Description:
Experimental test results are presented for three-layer, 1/2-inch-thick, 4- by 8-foot oriented strandboards, made from two mixtures of southern hardwoods using a 6 percent solids liquid phenol-formaldehyde resin. Test results corresponding to the average board densities of 45.3 pcf indicate that the flexural properties of the OSB were lower than those of commercial CDX 1/2-inch southern pine plywood; but in other properties, such as rail shear strength, interlaminar shear strength, and plate shear modulus, the OSBs were considerably stronger and stiffer than 1/2-inch plywood. Linear dimensional changes of the OSB with MC changes from 65 percent relative humidity to 48-hour soaked condition were equal to those of aspen waferboard and lower than those of southern pine plywood. However, thickness swelling of mixtures 1 and 2 of the OSB was 2 percent and 8 percent higher than that of aspen waferboard. The experimental results indicate that appropriate mixtures of high and low density southern hardwoods may be used to fabricate commercially acceptable 1/2-inchthick oriented boards for sheathing in housing. Such boards, although 5 to 10 percent denser than aspen waferboards, should also be substantially stronger and stiffer.
Experimental test results are presented for three-layer, 1/2-inch-thick, 4- by 8-foot oriented strandboards, made from two mixtures of southern hardwoods using a 6 percent solids liquid phenol-formaldehyde resin. Test results corresponding to the average board densities of 45.3 pcf indicate that the flexural properties of the OSB were lower than those of commercial CDX 1/2-inch southern pine plywood; but in other properties, such as rail shear strength, interlaminar shear strength, and plate shear modulus, the OSBs were considerably stronger and stiffer than 1/2-inch plywood. Linear dimensional changes of the OSB with MC changes from 65 percent relative humidity to 48-hour soaked condition were equal to those of aspen waferboard and lower than those of southern pine plywood. However, thickness swelling of mixtures 1 and 2 of the OSB was 2 percent and 8 percent higher than that of aspen waferboard. The experimental results indicate that appropriate mixtures of high and low density southern hardwoods may be used to fabricate commercially acceptable 1/2-inchthick oriented boards for sheathing in housing. Such boards, although 5 to 10 percent denser than aspen waferboards, should also be substantially stronger and stiffer.
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