At the 30 th IRG meeting held in Rosenheim, Bavaria, Germany, we reported on a Polymeric Alkylphenol Polysulfide (PXTS) which shows potential as a new non-leachable, environmentally compatible wood preservative compound exhibiting excellent biocidal efficacy. Comparative soil-block test results showed that PXTS was twice as effective as Creosote when evaluated against both white- and brown-rot fungi, including the creosote tolerant fungus, Neolentinus lepideus. Additional data collected from the laboratory soft-rot test and field stakes continue to verify the efficacy of this compound. After 20-months exposure in a soil bed soft-rot test, PXTS appears to be approximately four times as effective as creosote. After 18 months exposure all of the field stakes are in excellent condition. The results of a battery of standard toxicological test protocols conducted recently look promising and further tests are being carried out in conjunction with relevant governmental regulatory agencies. Some preliminary laboratory decay test results for a modified PXTS formulation look promising and additional tests with this material have been initiated.

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