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Durability for years

Durability

The durability of thermoJESION

THE ADVANTAGES OF A THERMALLY MODIFIED WOOD had been known for a very long time, for example hundreds of years ago the Vikings used charred wood in external structures. Such wood showed increased resistance to biodegradation and was obtained in a completely eco-friendly way.

 

THE FIRST ATTEMPTS AT THERMAL MODIFICATION OF WOOD to good effect has been undertaken already in the mid-1950s of the 20th century, however, the costs of implementing these technologies for industrial production were then too high, and demand for this type of wood was not as high as today.


AT THE BEGINNING OF THE 90S OF THE 20TH CENTURY in Finland, France and the Netherlands these tests started again. Finland has carried these tests most intensively and extensively.

 

The process of thermal modification of wood can be easiest explained as exposure of the ash wood to high temperature ranging from 170 ° C to 230 ° C in combination with an inert gas and water.

 

This process takes place in a sophisticated computer-controlled device. Under the influence of high temperature the dissolution of hemicellulose occurs, consequently the fungi and bacteria are deprived of nutrient, which makes thermoash resistant to rotting.


The internal structure of wood is also changed to a large extent, thus thermoash is far less hygroscopic or in other words has greater dimensional stability.

The German Institute of Albert-Ludwigs-Universitet: „Kurzberricht zum Forschungsprojekt Hygro-thermisch modyfiziertes Holz nach dem WTT-Verfahren” Freiburg 2009 specifies the biological durability of thermoash (modification over. 180°C) as class 1.
This means thermoash is qualified as the most resistant type of wood, as shown in the following table.

 

class 1

class 2

class 3

class 4

classa 5

Very high resistance
Over 25 years
High resistance
15-25 years
Medium resistance
10 -15 years
Low resistance
5 -10 years
No resistance
Less than 5 years
Teak
Merbau
Iroko
Bangkirai Siberian larch
Oak
Spruce
Pine
European larch
Ash
Beech
Birch
Thermoash
Thermooak
Thermobeech
Thermopine
Thermospruce
x x x
Outside
Contact with the soil
Always wet
Outside
No soil contact
Often wet
Outside
No soil contact
Sometimes wet
Inside or under a roof
Dry
Inside
Dry

Table of classes of resistance for external conditions

Producent drewna modyfikowanego termicznie ThermoJESION

ITD