The material properties of the finished product are influenced by wood selection and pre-treatment procedures, as well as wood species and treatment level used. The following data apply to ThermoWood made from Scots Pine (Pinus Silvestris) and Norway spruce (Picea Abies). Due to the influence of material selection and processing, the data cannot be transferred to ThermoWood made from other species or by other manufacturers.

Dimensional stability and durability

Resistance against insects and termites

ThermoWood is resistant to Longhorn beetles but not resistant against termites.

Heat conductivity 

Declared thermal conductivity determined according to EN-ISO 10 456 is for:
Pine ThermoWood D: l = 0,10 W/mK (untreated rough sawn pine l = 0,135 W/mK) and Spruce ThermoWood D: l = 0,09 W/mK (untreated rough sawn spruce l = 0,125 W/mK).

Strength properties

The strength of the wood is reduced during the heat treatment process at the same time as brittleness increases. As the strength reduction is greatly influenced by knots, we recommend contacting our sales organisation regarding choice of wood quality for ThermoWood used in load bearing applications. The stiffness of the wood is generally only affected to a minor extent. Brinell hardness is generally slightly higher or unaffected as compared to untreated wood.

Mechanical fasteners
Characteristic pull out strength of 4,5 x 35 mm screws is higher than 1,7 kN (EN 1350)