engleski

Oils usage in finishing of thermally modified wood in outdoor applications

Thermally modified wood is increasingly used in outdoor conditions, but its surface also undergoes to degradation by weathering as well as unmodified wood. Oils are largely used for protection of wood surface in outdoor conditions because they are easy to maintain and recoat, and they enhance the appearance of wood surface. In this study, we measured the change of colour and gloss and surface cracking of thermally modified and unmodified wood samples treated with three types of oils during the accelerated weathering in QUV device. We also measured the permeability of liquid water and water-vapour according to HRN EN 927-5 and HRN EN 927-4. It was found that unmodified untreated samples had less surface cracks than the thermally modified untreated samples during accelerated weathering. Oils treatment reduced the cracking of the thermally modified samples. Teak oil and oil for thermally modified wood offered similar protection to exposed thermally modified wood surfaces from the effects of water and UV radiation, while the universal oil did not offer any protection from the colour change of modified wood during exposure. Since the oil coating is also susceptible to photochemical degradation, for a pleasant appearance of wood surfaces during outdoor use it is very important the timely refinishing in accordance with the manufacturer's instructions.

thermally modified wood; wood finishing oils; accelerated weathering; general appearance of the surface; water permeability

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