A Comparison of Treating Characteristics of Pentachlorophenol Petroleum Solutions and Coal Tar Creosote in the Pressure Treatment of Southern Yellow Pine Poles

Six 35-foot southern yellow pine poles with 6 inch tips obtained near Brookhaven, Mississippi, were commercially treated with type 202E and creosote preservatives. The poles were cut in half, one half being treated with the 202E preservative and the other half with creosote. For each pole section the moisture gradient through the pole before and after treating and the oil distribution before and after treating were determined by assaying sample disks cut from each pole section. Creosote treatments were similar to those used commercially, while penta treatment schedules were varied to ascertain the effect of treatment time. Reduction in steaming and vacuum times up to 4-1/2 hours for the penta-treated material was achieved yielding no apparent ill effects. The treatment time to refusal was shown to be consistently less for 202E. The oil distribution, determined by extraction, was better for the penta-treated poles, and the initial air pressures required for a given retention were considerably lower for the 202E preservative.

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