Colour as a quality indicator for industrially manufactured ThermoWood®

Since its market entry in 2001, ThermoWood® has become the most established form of thermal modification globally. Whilst properties have been widely reported, there is still a need for readily-applied quality control method to ensure treatments meet criteria outlined by International ThermoWood Association. One such focussed on use colour measurements. In largest study kind, measurement data evaluated Norway spruce and Scots pine subjected Thermo-D process at twelve industrial plants between 2007 2018. This showed that according CIELAB* space newly planed surfaces thermally modified timber (TMT) may be used with regard intensity, i.e. combined effect temperature (212 ± 3°C) time. order obtain more robust control, only L* parameter (lightness) should as indicator, both a* b* parameters TMT little variation from those unmodified wood too high scatter values.