Thermodrevsin for baths and saunas

Wood has always been a favorite building material, but it is subject to decay, swells from dampness, and burns in fire. The latest technologies made it possible to process wood so that it acquired unique properties, remaining essentially the same environmentally friendly material, but acquired new, unique qualities. How did you manage to achieve this? This is the temperature treatment, which completely changed the structure of the wood, and made it possible to make the tree much stronger, and also made it resistant to mold and fungi.