Improving Surface Quality of Wood Using Waste Olive Oil by Heat Treatment After Weathering

Experiments were conducted with the aim of improving the surface properties of Oriental beech (Fagus orientalis Lipsky) wood after weathering, including colour, gloss, and roughness, by means of heat treatment with waste olive oil (WOHT).First, WOHT was applied at 200 ℃ and 230 ℃ for 2 and 4 hours.Then, for three months, Oriental beech specimens were exposed to the weather in the Muğla region (Southern Aegean, Türkiye).After weathering, colour, gloss, and roughness tests were performed according to the ASTM D1536-58T (1964), ASTM D 523-14 (2018), and DIN 4768 (1990) standards, respectively.All treatment groups except the control group were found to have positive ΔL* values after weathering.The values of total colour change (ΔE*) for WOHT Oriental beech were better than for the unheated (control) group.The best colour stability was obtained for WOHT Oriental beech heated at 200 ℃ for 4 hours.The glossiness of all specimens decreased after weathering, but the gloss results for WOHT Oriental beech were better than those obtained for the unheated (control) group.Lower temperatures and durations of heat treatment resulted in smaller decreases in the gloss of WOHT Oriental beech on weathering.The roughness of all specimens was increased by weathering, but lower roughness values after weathering were obtained for WOHT Oriental beech than for the control group.