In this study, it was aimed to determine some physical properties of Uludag fir (Abies bornmulleriana Mattf.), oriental beech (Fagus orientalis Lipsky) and Scots pine (Pinus sylvestris L.) woods impregnated with waste of boron oil. For this purpose, the samples were impregnated with two different methods according to ASTM-D 1413 standards. In the first method, full cell method, for an hour the wood materials were vacuumed for an hour and then they were impregnated under 4 atm for an hour. As for the second method, test samples were immersed in waste boron oil for an hour. The result of the experiments show that the highest amount of retention, retention ratio, unburnt pieces and ash were observed on Scotch pine samples by using immersing method, the highest density, temperature, CO2 and CO were observed in beech samples by using pressure method. The highest weight loss was occurred on beech pressure control and the highest O-2 ratio was observed on Abies control test samples. As a conclusion, the wood material should be impregnated by pressure method if it is to be used in the fields which will be exposed to physical pressure.