Based on surface water varnish was applied to the heat treatment effect of

Wooden is one of the most important construction materials. Being hygroscopic, anisotropic and organic forms are the important characteristics for a wood material. Wooden is weak against the external effects. So, it is necessary to apply proper protection techniques to improve its economic life. In this study, the effects of the heat treatment of wooden materials on hardness, brightness and adhesive resistance of varnishes were investigated. For this purpose, firstly Pinus sylvestris L., Fagus orientalis L. and Castanea sativa M. wooden samples were varnished by the water based varnish and after that they were kept in temperatures of 100 °C, 125 °C and 150 °C for times of 2, 4 and 6 hours.According to test results it was determined that while the hardness and adhesive resistance were improved for all samples which were processed 2 hours in temperatures of 100 °C, the brightness adhesive resistance and brightness of the samples which were processed 4 and 6 hours in 100 °C and 2, 4 and 6 hours in 125 °C and 150 °C were deteriorated. Furthermore, it was observed that the hardness resistance of all samples which processed for 2, 4 and 6 hours in 100 °C, 125 °C and 150 °C were high.In the experimental applications of the whole wood species are seen couple component varnish according to single component varnish which is highest grade values.Key Words: Heat treatment, Brightness, Adhesive resistance, Water based varnish, Hardness.