The Pressure Treatment of Western Larch, Pole Sections with Pentachlorophenol Solutions

Pole sections of Larix occidentalis Nutt. were treated to refusal with three pentachlorophenol solutions by the Lowry process in a small laboratory cylinder. Solutions and borings were analyzed for pentachlorophenol content. An average over all retention of 8.5 pounds per cubic foot was obtained in sections having an average diameter of 6.8 inches. The average sapwood retention by weighing and by extraction was 22 pounds per cubic foot. The average solid penta sapwood retention was 0.98 pounds per cubic foot. Full sapwood penetration was obtained with a wide range of sapwood retentions. Virtually no radial penetration occurred into the heartwood. Pole surfaces were clean after treatment and no bleeding occurred during outdoor exposure. A sapwood retention of 15 pounds per cubic foot is recommended.

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