The Bending Strength Properties of Some Wood Types Impregnated With Fire Retardant Chemicals

This study has done in order to determine the effects of impregnation with fire retardant chemical materials on the bending strength of Oriental beech, European oak and Scotch pine wood materials. To achieve this goal, test samples prepared from woods of Oriental beech (Fagus orientalis Lipsky), European oak (Quercus petraea Lieb.) and Scotch pine (Pinus sylvestris Lipsky) according to TS EN 345 regulations were impregnated with ammonium-sulfate [(NH4)2S04], sodium acetate (NaC2 H3O2.3H2O), aluminum chloride (Al2C6.I2H2O), borax [Na2B4O7.5H2O], boric acid [H3BO3] and, borax + boric acid (w:w=%50:50). The bending strength of impregnated samples were determined according to TS EN 408. Consequently, according to wood species; bending strength was found the highest value at Oriental beech (102,7 N/mm2) and the lowest value at Scotch pine wood (86,72 N/mm2). According to variety of impregnation; bending strength values were found no statistical difference between control samples and impregnated test samples. Considering the interaction of wood type and process; bending strength was found the highest value at beech + borax (112,90 N/mm2) and the lowest value at pine + control samples (75,71 N/mm2). In consequence, in the massive construction and furniture elements that the bending strength after the impregnation with borax is of great concern, Oriental beech wood materials could be recommended.