Description complète

We are the German market representatives of the Finnish ThermoWood producer Lunawood. But being a wood with altered properties means also that making thermowood fire-proof requires a specific fire retardant, tested and certified on thermowood. The timber will turn a silver grey colour if left to weather naturally. The changes to the physical properties give Thermowood greater stability over untreated or chemically treated timber.

Newly treated ThermoWood when exposed to rain will leak small amounts of compounds but due to its all natural processing no chemical leaching will occur, also the resin from the wood is removed during the steaming process and so the problem of resin leakage is eliminated.

Thermo-timber is wood having been modified concerning its qualities by means of thermical processing (high-temparature processing). Lowered equilibrium moisture content officialaushop.com of Thermowood makes it dimensionally stable and the material retains its shape far better than untreated wood.

Heat treatment removes resin from redwood timber. The high durability of thermowood makes it very ideal to be used outdoors as well as indoors. During the weathering process wood can appear unsightly as the material can blacken due to moisture getting into the fibres and pulling out tannins and extractives.

In effect the process creates a new timber species with its own specific properties. Compared to untreated wood, thermowood has a slightly decreased pH level. Finotrol Oy awards a certificate to companies that meet the quality requirements, on which basis the International Thermowood Association awards companies the right to use the TMT certification label.

During the heat treating process the wood is aged » so that it takes on the structure of a more refined wood type whilst still remaining comparatively light in weight. Improvements in biological durability are a result of the removal of natural food sources in the wood and also changes in the chemical and structural composition.

For Scots pine only sound knotted heartwood originated from top log is suitable for our products. As a result of the ThermoWood process, the dimensional stability, biological durability and insulation properties are permanently improved. During the heat treatment, chemical and structural changes occur within the timber which alter and improve some of its basic characteristics.

The process is completely natural and chemical free, using only high temperatures and steam to transform and control the timber’s characteristics. However, a small increase was observed for CS values of heat treated wood species. 2: Thermal modification takes place – Moisture content of wood is dropped to close to zero, and then heated to 212oc.

EMC of thermally modified wood is lower than natural wood. Thermowood is less likely to warp, twist or cup due to the inability to absorb or lose moisture caused from the thermal modification process. The CE marking is the manufacturer’s declaration that the product is in conformity with the EU requirements that apply to it. All Lunawood exterior cladding products are CE-marked, which guarantees their performance.

Changes occur during the heat treatment which makes it absorb less moisture, this limits the potential for shrinkage and swelling of the board making it an excellent choice for cladding. Under the direction of Dr. Nenad Vidovic, the Sansin Research & Development team conducted extensive testing of Sansin’s core line up of products in a variety of heat-treated wood applications.

The properties and quality requirements of the spruce that we use in production are similar to those of pine. Thermally treated wood should not be used in ground contact. Thermowood is slightly more fragile and dryer than normal wood, so risk of tearing has grown a bit when processing the wood in horizontal direction.


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