Services for thermal modification of any wood, coniferous, deciduous and rare types. Sale of thermo- modified wood.

learn more about thermo-modification

THERMO-MODIFICATION – is the most modern, 100% environmentally friendly technology of biological and atmospheric protection of wood without any use of chemicals. The service life of products made of thermo-wood is 3-5 times longer in comparison with classical methods of protection including antiseptics and impregnants
Thermowood production process

THERMO-MODIFICATION OF WOOD is a heat treatment process based on the use of high temperatures and steam.

No chemicals are used in the heat treatment process.

The process improves dimensional stability and biological resistance of wood.

Improves the thermal insulation properties of wood, since the process of thermal modification leads to a decrease in thermal conductivity.

 Heat treatment removes the resin from the wood.


The process is conventionally divided into three stages:

DRYING - The temperature rises to 130 degrees Celsius , since there is water in the chamber, and at a temperature of about 100 degrees, the water both in the chamber and in the wood begins to evaporate, due to which the wood is dried with steam, steam is a natural protection to prevent cracking of the wood. Steam also softens the wood, preparing it for chemical changes and modifications

THERMO-MODIFICATION - The temperature in the chamber rises to around 185-225 degrees Celsius . The maximum temperature depends on the desired end result, due to the way the wood will be used. When the peak temperature is reached, it is fixed for 2-3 hours (the time depends not only on the type of wood but also its quantity and geometric dimensions). The steam environment protects the wood from fire and also influences the chemical processes in the wood.

COOLING - The temperature in the chamber is reduced to 50-60 degrees Celsius, after which the wood is ready for mechanical processing.

Thermal modification process graph.
Areas of application of the thermo-wood

 Garden furniture production

 Finishing the facades of terraces and any outdoor objects

 Manufacturing and decoration of fences, doors, windows

Benefits of working with us
Flexible pricing policy
Preliminary examination of samples
Selection of optimal heat treatment process
Computer control of the process
1. How expensive is thermo-modification of wood?
- This method of wood processing is among the best and only 100% environmentally friendly way of protection that does not require reuse. The processes that took place in wood after thermal modification are not reversible. Products made of thermo-wood are usually 1.5-2 times more expensive than similar products having vacuum impregnation.
2. What types of wood can be thermally modified?
- The process is suitable for most types of wood. The process must be optimized individually for each type of wood and take into account its geometric dimensions. 
3. Does the strength of the wood decrease after thermo-modification?
- As a rule, the strength of wood is directly connected with the density. As a result of a decrease in density during heat treatment, strength also decreases, but the weight-strength ratio practically does not change.
4. Is it true that thermo-wood is more fragile?
- Heat-treated wood is less resistant to splitting. The higher the heat treatment temperature, the lower the splitting resistance. On average, splitting resistance is reduced by 30-40%. Therefore, pre-drilling is recommended.
5. How does thermo-wood absorb moisture?
- Heat treatment reduces the equilibrium moisture content of the wood. When processed at high temperatures, the moisture content can be 40-50% lower compared to untreated wood. Heat treatment significantly reduces radial swelling in tangential delamination. Heat-treated wood is not stressed during drying. The swelling and contraction of the wood is very low. The heat treatment process reduces the water absorption of the wood by 20-30%.
6. How durable is thermo-wood?
- Standard tests (EN113, ENV 807) performed in laboratory have shown significant improvements in biological resistance and in biological longevity due to the removal of the natural food source from the wood, as well as changes in the chemical and structural composition of the wood. The service life is 3-5 times longer than that of regular wood.
7. Is thermo wood affected by UV radiation?
- Like most natural materials, this type of the wood is not able to resist ultraviolet radiation. As a result, the color in a while changes from the original brown to gray color when exposed to direct sunlight. - The original color can be preserved with pigment-containing preservatives or preservatives with UV filter.
8. Is the wood weather resistant?

- When using thermo wood under atmospheric influence, the natural moisture content during 5 years of operation is two times lower than that of regular wood.

- As with all materials exposed to natural weather conditions, mold growth can occur on the surface of thermo wood. Bacteria in the air or rain-borne dirt can cause fungus to grow on an untreated surface. However, this is only observed on the surface and can be removed - wiped off or scraped off.

- The most optimal protective coating systems for thermos wood includes an oily primer and a soluble-based alkyd top coating or a water-based acrylic coating.

9. What does thermo wood smell like?
- The smoke-like smell from thermos wood comes mainly from furfural. After some time, the smell disappears, and it can also be removed with the help of a protective surface treatment. The VOCs released from the thermo wood are just fractions of common pine components.
10. Is thermo wood toxic?
- No toxic or harmful components can be found in thermo-wood. Such wood has even been tested as a bone substitute. However, if chips get under the skin, they must be removed as soon as possible, as is the case with regular wood.
11. What is the fire safety of thermo-wood?
- Thermo-wood does not differ significantly from regular wood when it comes to fire safety.
Where we are

Manufacturing facility

Vilnius, Kalno g. 4A



+370 (654) 41688