Samples of scots pine sapwood (Pinus sylvestris L.) were treated with solutions of (Copper II sulfat-5 hydro + fluoroboric acid) and (Copper II sulfat-5 hydro + fluoroboric acid + boric acid) in order to determining to leachability and decay resistance against brown rot fungus (Postia placenta) and white rot fungus (Coriolus versicolor). Results indicated that the copper in treated wood is less strongly bound because of the higher copper concentration in the leachates from treated wood and leaching rate of Cu is highest initially and decrease over time. After leaching, however, weight losses increased because of the leaching of copper and boron compounds from wood, revealing a lower decay resistance.

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