The Condensed tannins are natural wood preservatives found in high concentrations in the bark and wood of some tree species. Condensed tannin-containing bark extracts from loblolly pine (Pinus taeda) were evaluated äs wood preservatives using Standard methods. Bark extracts by themselves did not cause any reduction in weight loss of pressure-treated wood blocks at the retentions tested. However, they do have efficacy äs wood preservatives when complexed with copper (II) ions. The best experimental wood preservative formulation was a dual treatment using a sulphited bark extract first, followed by a CuCl 2 treatment. At some retentions, this method yielded wood blocks with greater resistance to decay by Coriolus versicolor than pentachlorophenol. A single stage treatment of extract plus copper using an aqueous ammoniacal solvent was also successful but not äs effective äs the dual treatment.
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