Protection from Termites: Penta for Particle Board

With the goal of obtaining new markets for particleboard in the termite infested tropics, two sets of particleboards were prepared under standard conditions, one set bonded with urea resin and one set with phenolic resin. Pentachlorophenol was incorporated into the boards based on ovendry particle weight at nominal levels of 0.0, 0.75, and 1.25 percent. The board samples and controls were installed in Florida test plots for exposures of 6 months, 1 year, 2 years, and 3 years. To date only the 6-month and 1-year exposures have been evaluated. The tests show that after 1-year the urea-formaldehyde-resin bonded boards were so swelled and weakened that the pentachlorophenol was no longer a determining factor. All the phenolic-resin bonded specimens with 0.75 to 1.25 percent pentachlorophenol content were preserved during the first year exposure, while the untreated controls were badly damaged by termites. It is concluded that sodium pentachlorophenate (1 percent) added to the resin before it is sprayed on chips should provide satisfactory protection of phenolic particleboards from termites.

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