Substantially more stable than normal wood
Thermally Modified Wood is manufactured by heating the wood to a temperature of 160º C (320º F) while it is protected with steam. Besides providing protection, the steam also affects the chemical changes taking place in the wood. As a result of the treatment, thermally modified wood is created. Its color darkens, it is more stable than normal wood in conditions of changing humidity, and its thermal insulation properties are improved.
Thermal modification changes properties in wood
- Lower moisture content (less movement in service)
- Higher decay resistance (however not termite resistant)
- Color (hemicelluloses converted to dark furans)
- Strength properties (reduction in some – stable in others)
- Thermal properties (better insulator due to density reduction and less moisture)