Relative Effectiveness of Several Oil-Soluble Wood Preservatives. Condition of Dip-Treated Stake and Boardwalk Assemblies Exposed One Year to Decay and Termite Attack

Stakes and boardwalk assemblies were exposed to decay and termite attack in field tests at Syracuse, N. Y., and Gainesville, Fla. After 1 year of exposure important differences in effectiveness of the preservatives are apparent. No decay or termite attack developed in any pressure-treated wood at either region, while considerable decay and termite attack developed in dip-treated stakes. The preservatives included pentachlorophenol, copper naphthenate, copper-8- quinolinolate, rosin amine D pentachlorophenate, and zinc alkyl sulphonate. Test specimens 2 by 4 inches nominal by 18 inches (stakes) and 1 by 4 inches nominal by 18 inches (boards) were sawed from selected ponderosa pine. The specimens contained only sapwood. Test specimens for dip treatments were immersed in the treating solution for 15 seconds and 10 minutes. Pressure treatments were made in a standard pressure cylinder at a pressure of 100 psi for 1 hour. Five percent pentachlorophenol, 2 percent copper naphthenate, and 7.5 percent rosin amine D pentachlorophenate were the most effective preservatives in both regions.

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