Residual Pentachlorophenol Still Limits Decay in Woodwork Twenty-Two Years After Dip-Treating

Experimental panels of conventional tongue-and-groove flooring lumber of 5 different wood species were dip-treated 3 minutes in a 5 percent, light-oil solution of pentachlorophenol, then exposed off the ground in three diverse climates. Limited decay 22 to 23 years later evidenced continuing protection on all sites. Bioassay and X-ray spectrometric analysis of panels in western Oregon, where decay control was greatest, indicated penta was still present in small amounts.

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