The effects of artificial weathering on the pendulum hardness of chestnut wood applied with polyurethane varnish after heat treatment

The effects of artificial aging insert ignore into journalissuearticles values(576 h); on the oscillatory hardness values of Anatolian chestnut insert ignore into journalissuearticles values(Castanea sativa Mill.); wood applied with polyurethane varnish insert ignore into journalissuearticles values(PU); after heat treatment at 190℃ for 1.5 h and at 212℃ for 2 h were investigated. The results revealed that heat treatment, weathering time, and interaction were significant. The hardness values of the heat-treated materials were higher than those of the non-heat-treated test samples. The test samples heat-treated at 190℃ for 1.5 hours in the unweathered group showed the highest hardness value, whereas the test samples heat-treated at 190℃ for 1.5 hours in the weathered group showed the lowest value. The highest reduction rates after weathering were obtained on samples that were heat-treated at 190℃ for 1.5 h, followed by heat-treated at 212℃ for 2 h and non-heat-treated. It was observed that the heat treatment application caused different pendulum hardness values in chestnut wood samples covered with polyurethane varnish.