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Effect of Resin Types and Formulation on Internal Bond Strength and Dimensional Stability of Hardwood Flakeboard,
SOUTHERN FOREST EXPERIMENT STATION NEW ORLEANS LA
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A series of experiments was conducted to develop effective and economical resin systems to improve dimensional stability of southern hardwood flakeboards. First, boards 0.5 inch thick were made from 3-inch-long flakes of nine species of southern hardwoods. Dimensional stability was measured following 5-hour boil, vacuum-pressure soak, and 50 to 90 percent RH exposure test. Within the range of the experiment, all species except white oak and post oak yielded boards of acceptable dimensional stability at board density of 44.5 pounds per cubic foot or less. To improve dimensional stability, a resorcinol modified phenolic system was developed and tested. To produce a flakeboard of acceptably high durability from wood of high density species, a phenolic alloy of phenol-formaldehyde resin and polyisocyanate was developed.
APPROVED FOR PUBLIC RELEASE