Based on previous work of the authors on resins, the upgrading of wood with a true solution of a methanol etherificated melamine resin in low aqueous concentration was performed. For the relative assessment of the biological resistance against brown and white-rot fungi were used not only untreated controls of pine sapwood (Pinus sylvestris L.), but also heartwood of European larch (Larix decidua Mill.). Even at the lowest applied concentration of 7.5% resin in the treating fluid (about 10% weight gain), the treated wood showed considerably less mass loss than heartwood of European larch. Leaching according to EN 84 resulted in no difference. The above outlined is valid for lab tests according to EN 113. First results of ongoing experiments with samples in soil contact exhibited general problems of testing modified and resin treated wood, using standard methods made for classical wood preservatives.

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