With stricter restrictions on the use of biocides and increasing environmental awareness there is a pronounced need for effective bio-friendly protection systems in the wood preservative and wood coating industry. One of the possible pathways is to exploit and utilize natural substances with active biological effects. Silanes, caffeine, natural oils and potassium carbonate were chosen as compounds in 16 different formulations intended as wood protection systems. The aim of this study was to test the resistance of the selected protection systems against mould growth and growth of blue-stain fungi. Combination of caffeine and amino functional silanes showed good resistance towards blue-stain fungi when applied to pine and the same was found for the combination of linseed oil and amino functional silanes. Some indications of resistance towards mould fungi were also detected for the same chemical combinations.

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