The diffusibility of Boron in wood and thus the ability of its leaching is known since long. Nevertheless quantitative data on this process are only rarely available. To overcome this lack of information field exposure tests were started with beam-segments treated with pure boric acid and poles treated with CCB. In addition some of the beam-segments were surface-treated with a varnish to investigate the long-term protective effect of a surface coat on leaching of Boron. Detailed data of more than three years of field exposure are now available and will be presented. 46% and 15%, respectively, of the initial Boron content were leached from the uncoated and the coated beam-segments. The poles lost about 30% of Boron, 1,3% of Copper and 0,05% of Chromium.

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