The Gluability of Fire-Retardant Treated Wood

This study concerns the investigation of gluing of fire- retardant treated wood; more specifically, with hardwood plywood made from treated yellow birch veneer. Three commercial fire-retardant formulations at three different levels of retention were included in the test. Full-cell process of impregnation was employed in treating the veneer. The veneers were dried in a conventional lumber kiln. Several conclusions were drawn from these tests. Treatment of yellow birch veneer with fire retardants affects its gluing characteristics adversely. Interference with gluing generally increased with increasing levels of retention of the treating salts in the wood. Bonds produced with various combinations of treatments and adhesives passed both adhesive and plywood specification requirements but in many instances showed significant reductions in strength when compared with those obtained with untreated veneers. Treatment with fire-retardant chemicals resulted in an increase in the equilibrium moisture content of veneers.

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