Bitus Thermex - heat-treated wood
An industrial scale heat-treatment system has been developed at VTT in Finland, in collaboration with ThermoWood Association. The process is licensed to members of the Association and verified by a third-party through authorized inspectors. The process is patented and called ThermoWood.
The patented heat-treatment process means that the wood is heated to 190-212 Degrees Celsius and, in the process, changes some of its characteristics. It turns into a beautiful brown colour, which is comparable to a tropical tree species, as the cell structure changes.
ThermoWood offers good features such as:
- Increased durability against rot
- Increased dimensional stability
ThermoWood is produced in two classes:
Thermo-D pine/spruce 212 ºC
Thermo- S pine/spruce 190 ºC
Thermo-D (212 ºC) is recommended for outdoor use due to its good dimensional stability and resistance to rot. According to research, among them SP Technical Research, ThermoWood-D is classified as resistant, class 2 according to EN-350-1. Intended for use above ground.
Examples of recommending uses:
decking, cladding, fencing, noise barriers, windows, doors, etc.
Thermo-S (190 ºC) is primarily recommended for use indoors due to the wood’s greater dimensional stability and its largely retained strength & durability.
Examples of recommending use:
Sauna, interior wall panels, furniture, flooring, etc.
As the ThermoWood process alters hemicellulose cells, gum, resins, etc., which raw material used in the process is very important.
The raw material used is already selected at sawmill level, and additional sorting is carried out after heat-treatment.