The heat treatment process is carried out in a completely closed system (autoclave), where, as a result of high temperature, pressure and steam, the wood is not completely dried out. Natural moisture is retained in the wood and such a treatment is gentler for the wood and also invariably guarantees high-quality and consistent results.

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Harilik haab or aspen (Populus tremula) is pajuliste a species of poplar trees.
Eesti kõrgeim lehtpuu . The tallest tree in Estonia. Common aspen is the only tree in the Populus genus that grows naturally in Estonia. It can grow up to 40 meters tall.
Aspen is a dioecious tree, with male and female catkins on different trees. Aspens grow singly or in small groves. The trees in one grove usually have the same gender, because they originate from the root sprouts of the same parent tree.

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Common alder has two names: gray alder and white alder, which indicate to the color of the bark: unlike European alder or black alder its bark is light gray. Common alder differs from black alder also in respect to other features. Gray alder never grows as a huge giant in the forest. It generally forms thick alder brushes on the fringe of a forest and on former glades. Gray alder can easily be distinguished from its relative on the basis of its leaves.

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