A Modified Method for the Preservative Treatment of Southern Pine Fence Posts

The tests here reported were made to ascertain what influence difference in relative density and growth rate of loblolly pine posts treated under low pressure at short times had on the net retention of preservative. A total of 180 six- foot posts were peeled by a Lowther chain-type mechanical peeler. The amount of heartwood in the posts was negligible. After peeling the posts were open-stacked under light shade for 6 months of seasoning. The preservative used was a 5 percent concentration of pentachlorophenol in Esso Standard Oil No. 214-A heavy diesel fuel. The preservative temperature was atmospheric, averaging 76?F. The treating cylinder was filled and emptied of preservative as quickly as possible. Filling time ranged from 2 minutes to 3 minutes. The time required to empty the cylinder ranged from 2 to 4 minutes. The average retention for all posts was 7.53 pounds per cubic foot and the average penetration of the sapwood was 85 percent. A 15 psi treatment for 10 minutes resulted in complete penetration.

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