Synergistic effects pertaining to wood preservation have been investigated by combining different polymerizing agents with modifying chemicals, modifying chemicals with known preservatives and new types of preservative chemicals with each other. One of the investigated methods is the use of impregnating solutions based on furfuryl alcohol (produced from biomass), in which the chemicals polymerizes in the wood during a heating step. Some of the other methods included in this work are the combination of an oxidizing agent (sodium periodate) with a triazole (propioconazole) and kraft lignin with copper sulphate. The results of biological testing in both pure cultures of basidiomycetes and in terrestrial microcosms with three different types of soil were very satisfying, in many cases showing low weight losses due to microbial decay.

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