In this study, the physical mechanical properties of wood-polymer composites prepared from alder (Alnus glutinosa (L.) Gaertn. subsp. barbata (C.A.Mey.) Yalt) wood were investigated. Three different monomers styrene, methyl methacrylate and styrene/methyl methacrylate (70/30) mixtures and two loading levels were used in preparation of wood-polymer composites. Of physical properties, the oven-dry specific gravity, the ratio of water uptake, the water repellent effectiveness and from mechanical properties; the compression strength parallel to the grain were determined. Full loading applications gave the best results for all monomer. The oven dry specific gravity, the water repellent effectiveness and, the compression strength parallel to the grain were found between 0.710-0.950 gr/cm3, 39.45-85.78% and 338.78-645.13 kp/cm2 respectively.

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