Fortified Wood Preservative for Southern Pine Poles

By adding 2 percent, by weight, of pentachlorophenol to coal tar creosote, the toxic efficiency is increased some 40 percent over that obtained by using either creosote or pentapetroleum alone. This added toxicity will take most individual poles with low retentions out of the risk class. The chance of bleeding is still minimized because the liquid retention level is not increased. All southern pine poles for Bell System use are now being treated with this new preservative under a “results-type” specification.

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