Trials of two powdered preservatives for phenol-formaldehyde-bonded and polymeric-isocyanate-bonded aspen structural composite board

Two heat-stable preservative powdered formulations were incorporated into aspen composite panels to determine their effects on decay resistance, dynamic modulus of elasticity, and internal bond strength. Both phenol-formaldehyde and polymeric-isocyanate resins were used. A triazole-type preservative (Azaconazole) added at 0.4 percent a.i. (based on ovendry wood weight) as a powder to the furnish provided good decay protection against brown- and white-rot fungi, was leach-resistant, and bid no significant influence on mechanical properties. Performance decreased markedly when Azaconazole was added directly to the polymeric-isocyanate resin. A second preservative (FNG), which contained copper and sulfur, was much less effective in decay protection at the level used (0.1% copper added to wood), and caused greater mechanical property losses.

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