A series of 460-mm long, end-sealed southern pine pole stubs were treated with chlorothalonil in hydrocarbon solvent. Over sixty sections were treated using various combinations of initial seasoning (kiln-drying, steam-conditioning), treating temperature (ambient, 200°F), initial air pressure, and final conditioning (steam flash + vacuum, expansion bath + vacuum, steam distillation + vacuum). Disks removed from the treated sections were analyzed for preservative gradient. Results are discussed in terms of treatability and the impact of treating variables on preservative retention, penetration, and gradient shape.

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