Threshold Values for Wood Preservatives

Failure in wood due to decay or insects starts because the natural toxicity of the wood or the original preservative concentration has been changed or reduced to a point just below that of retention, defined as the threshold concentration. Two important conclusions can be derived from the tests reported here. First, total threshold concentrations of supplementary preservative chemicals, as determined by Standard ASTM D 1413 soil-block techniques on untreated wood, are not required for protection when supplementing sub-threshold retentions of creosote. Second, sodium borate is superior to sodium fluoride as a wood preserving chemical for use as a water-borne salt preservative in a supplementary treatment for previously creosoted wood in the below-ground area. These conclusions are based on laboratory tests only.

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