Pentachlorophenol and Heavy Petroleum for the Preservative Treatment of Railway Crossties

An experiment was set up to determine the preservative effectiveness of 2.50, 3.75, and 5.00 percent pentachlorophenol in oil, and 50-50 creosote petroleum. The threshold for the weathered ties with 50-50 creosote-petroleum treatment was 14 lbs. of solution per cu.ft. of wood against Madison 617 (Lenzites trabea), compared with a threshold of 3.1 lbs. per cu.ft. for the weathered ties with 2.48 percent pentachlorophenol solution against the same fungus. Stakes of 3/4 by 3/4 by 18 inches were pressure treated, installed at Lake Jackson, Texas, and Bogalusa, Louisiana, and inspected annually. Ten stakes for each treatment with 8 lbs. retention per cu.ft. were selected for installation. The 7-year result indicated that 5 percent pentachlorophenol petroleum; can be extended in the same manner that creosote has been extended in the past.

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