Most of the European wood species does not have durable wood. In order to use it in outdoor conditions nondurable material has to be protected. Nowadays, non-biocidal solutions for wood protection are attracting a lot of attention, particularly in use class 2 and 3 applications. One of the non-biocidal techniques is treatment of wood with water repellents like wax emulsions and oils. Linseed oil and tung oil are one of the frequently used water repellents. In the present research, performance of linseed and tung oil treated Norway spruce and beech wood against wood decay fungi is reported. Additionally, short term hydrophobic properties (with tensiometer) and long-term hydrophobic properties (soaking in water) in laboratory and outdoor conditions (electrical resistance measurements) were determined. In all test results tung oil performed better than linseed oil.

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