Abstract: Thermo treatment process for wood comprising the following steps: a. Placing the wood batch to be treated in a treatment chamber; b. Exchanging the atmosphere inside the treatment chamber by evacuating the air, replacing the evacuated air by an inert gas atmosphere in gas form, at 8 to 12 bar pressure; c. Heating the inert gas atmosphere up to 165 to 175° C., d. increasing the pressure in the inert gas atmosphere to 14-16 bar; e. maintaining the temperature in step c. and the pressure in step d. for from 90 to 150 minutes; f. cooling the inert gas atmosphere to a temperature of 20 to 35° C. g. retrieving the treated wood batch.