The aim of this study was to investigate the effects of impregnation with boron compounds Borax (B(x)), Boric acid (B(A)), B(x) + B(A), Imersol-Aqua (I(AQUA)) and Timbercare-Aqua (T(AQUA)) on combustion properties of the laminated wood materials produced combination of Oriental beech and poplar veneers bonded with Desmodur-VTKA (D(v)) and Poly(vinyl acetate) (P(VAc)) adhesives. The test samples, prepared from beech (Fagus orientalis Lipsky) and poplar (Populus nigra Lipsky) woods, were impregnated boron compounds by vacuum, IAQUA by dipping and TAQUA by brushing methods according to ASTM D 1413-76-99 and directions of the manufacturer. The laminated wood materials were prepared in the form of five layers, 4 mm thickness from the impregnated beech and poplar veneers according to TS EN 386. Combustion properties of samples after laminated and impregnated process were determined according to ASTM E 160-50. Considering the interaction of combustion type and impregnation materials, combustion temperature was found the highest in flame source combustion (F(SC)) + T(AQUA) (528.150 degrees C) but the lowest in without flame source combustion (WF(SC)) + B(A) (391.333 degrees C). Consequently, boron compounds and I(AQUA) showed a decreasing impact on combustion properties of the laminated wood materials, produced combination of beech and poplar veneers, bonded with Dv. In consequence, impregnation with boron compounds and Imersol-Aqua of the laminated wood materials, bonded with Desmodur-VTKA, provides security for the usage of having high risk of fire. (C) 2008 Elsevier Ltd. All rights reserved.