A new wood preservative based on polymeric alkyphenol polysulfide (PXTS-A) is being evaluated in a series of laboratory and field tests and the results continue to show promise. A modified formulation (PXTS-B), which contains additives to reduce the viscosity, is being evaluated along with the original formulation. Soil block decay tests comparing PXTS-B with CCA-C indicate that PXTS-B is equally effective as CCA against a white-rot fungus, but only about half as effective against brown-rot fungi tested. PXTS-B was also tested against marine borers and shows good efficacy after one year's exposure. After 26 months exposure in a soft-rot test, PXTS-A is approximately five times as effective as creosote. In a field stake test after 29 months exposure, PXTS-A is fully effective at a retention of 40 kg/m3.

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