A laboratory method for measuring the depth of penetration of the fungicidal concentrations effective against basidiomycetes (brown rot) was developed. The tests on CCB oscillating pressure treated spruce transmission poles have shown that the depth of salt penetration can be increased by about 10 mm by a drill perforation before the impregnation. An even better penetration is reached, however, if an additional COBRA process with "Wolmanit-B-Mischung" is applied after the oscillating pressure treatment. In this way the entire cross section of spruce transmission poles is protected except for a core diameter of 30 mm.

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