Siberian larch has the reputation of a resistant tree species. However, due to its growing use alternatives are now being sought, with plantation wood, which has lower durability, increasingly appearing on the market. Siberian larch is known for issues associated with processing due to resin emissions. Therefore, we wanted to explore the possibilities of pre-treatment or various surface preparations of Siberian larch wood, which will enable quality treatment. We did a few quick tests beforehand. We were interested in the influence of different temperatures on resin leakage. The highest temperature roved to be the best. Half of all samples were exposed to 140 ° C for 30 minutes. For comparison purposes we performed the same tests on ordinary and heat-treated spruce. Samples were protected with various concentrations of Silvacera hydrophobic system (wax emulsion) and Remmers oil. Surface properties were tested in the laboratory and outdoors. In the laboratory we were interested in water repellence, short-term and long-term intake of water and water vapor. Outdoor samples were exposed to changing weather conditions. In this case, colour and surface changes were observed. Heat-treated spruce exhibited the best properties in laboratory tests. Better sorption properties and more excellent dimensional stability due to lower hygroscopicity are known for heat treatment. External tests showed the higher the pigment concentration, the more minor colour changes were detected. In some cases, pre-treatment did not affect the absorption of the preservative agent, and in others it worsened it.
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