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The purpose of this study was to determine the effect of industrial heat-treatment (ThermoWood) effect on some important properties (density, anti-swelling efficiency (ASE), electrical resistance, strength, hardness and color) of Iroko wood (Chlorophora excelsa). Samples were subjected to heat treatment at 190 °C for 120 min during the main heat treatment period (the total time of the process was 60 hours). The results showed that the applied process caused 4.6 % decrease in density. Dimensional stability was considerably improved, with ASE values of 13.2 %. The color became darker after treatment. The process caused a significant (p<0.05) reduction (3.35 to 25 %) of all investigated mechanical properties at a specific moisture level (12 %). However, the mechanical properties of wood are closely related to its moisture content, and heat-treated wood is less hygroscopic than untreated wood. After long-term acclimatization, most heat-treated samples had almost half the equilibrium moisture content of control samples. Although heat treated samples have lower water content and higher electrical resistance at the same soaking time, the obtained data clearly showed that heat treated samples had a slightly lower electrical resistance for the same moisture content compared to control samples.Cilj provedenog istraživanja bio je utvrditi utjecaj industrijske toplinske obrade (ThermoWood) na neka važna svojstva iroko drva (Chlorophora excelsa) (gustoću, učinak smanjenja bubrenja – ASE, električnu otpornost, čvrstoću, tvrdoću i boju). Uzorci su bili podvrgnuti toplinskoj obradi pri 190 °C u trajanju 120 minuta tijekom glavnog razdoblja toplinske obrade (ukupno vrijeme procesa bilo je 60 sati). Rezultati su pokazali da primijenjeni proces toplinske obrade uzrokuje smanjenje gustoće od 4,6 %. Dimenzijska stabilnost drva znatno je poboljšana, uz smanjenje bubrenja od 13,2 %. Nakon toplinske obrade drvo je postalo tamno. Toplinska je obrada prouzročila značajno (p<0,05) smanjenje (od 3,35 do 25 %) svih ispitivanih mehaničkih svojstava pri specifičnoj razini sadržaja vode (12 %). Međutim, mehanička svojstva drva usko su povezana sa sadržajem vode u njemu, a toplinski obrađeno drvo manje je higroskopno od neobrađenoga. Nakon dugoročne aklimatizacije većina toplinski obrađenih uzoraka imala je gotovo upola manju vrijednost ravnotežnog sadržaja vode od kontrolnih uzoraka. Premda su toplinski obrađeni uzorci imali niži sadržaj vode i veću električnu otpornost pri jednakom vremenu potapanja, dobiveni su podatci jasno pokazali da toplinski obrađeni uzorci imaju nešto nižu električnu otpornost pri jednakom sadržaju vode nego kontrolni

Effects of Industrial Heat Treatment on Some Physical and Mechanical Properties of Iroko Wood