Fungistatic Effectiveness and Leachability of Copper Abietate and Formate Preservatives

Copper abietate was found to protect wood against the copper-tolerant fungus Poria monticola and to be resistant to leaching by water. Copper formate, fixed in the wood by a steam treatment, was resistant to leaching but gave poor protection against P. monticola. Soil-block tests with P. monticola were performed with both preservatives. The leachability of each compound was also studied. Commercial copper formate containing 26.8 percent copper by weight was used; the copper abietate, not being commercially available, was prepared from wood rosin. The dry precipitate was dissolved in varsol, and the solution was filtered to remove traces of copper hydroxide. The copper abietate contained 6.4 percent copper by weight. Cubes of red pine sapwood, 3/4-inch on edge, were employed. The blocks were impregnated with a graded series of concentrations of preservatives as recommended in ASTM D 1413-56T.

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