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Thermal modifi cation of wood permanently alters several of its chemical and physical properties. Beech wood is one of the most important hardwoods in Central and Eastern Europe and is extensively used in furniture production. In this study the effects of thermal modification of beech wood (Fagus sylvatica L.) on hygroscopic properties were examined and the color changes of the treated wood were determined. Beech wood has been subjected to a heat treatment at the temperature of 180 °C for five different durations ranging from 2 to 10 h. A more intense, gradual color change of the treated samples was observed after 4-h treatment, whereas in some other cases the recorded alterations were less intense. The most pronounced color differentiations compared to untreated samples occurred in 8-h and 10-h treatments. Dimensional stability and absorption were measured after 1-h, 3-h, 6-h, 1 day and 3 days immersion in water. The 8-h treatment duration exhibits the greatest reduction of swelling and absorption percentage.Toplinska modifikacija drva trajno mijenja neka njegova kemijska i fizikalna svojstva. Bukovina je jedna od najvažnijih vrsta tvrdog drva u srednjoj i istočnoj Europi, a uvelike se upotrebljava za proizvodnju namještaja. U ovoj su studiji predstavljeni rezultati istraživanja utjecaja toplinske modifikacije bukovine (Fagus sylvatica L.) na neka higroskopna svojstva i promjene boje toplinski obrađenog drva. Bukovina je podvrgnuta toplinskoj obradi pri temperaturi 180 °C i tijekom pet različitih trajanja procesa obrade, od dva do deset sati. Intenzivnije promjene boje toplini izlaganih uzoraka uočene su nakon četiri sata, dok su u drugim slučajevima zabilježene manje intenzivne promjene. Najintenzivnije razlike u boji u usporedbi s netretiranim uzorcima dogodile su se nakon osam i deset sati obrade. Dimenzijska stabilnost i apsorpcija mjerene su nakon jedan sat, tri sata, šest sati, jedan dan i tri dana potapanja uzoraka u vodi. Nakon potapanja uzoraka u vodi u trajanju od osam sati zabilježeno je najveće smanjenje bubrenja i postotka apsorpcije

Changes Caused by Heat Treatment in Color and Dimensional Stability of Beech (Fagus sylvatica L.) Wood