Protection from adverse factors of biological nature

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Direct impact of biological organisms. These include wood-boring insects and various types of microorganisms, including fungi.
Fire protection is performed by saturating the wood mass with concentrated solutions of some mineral acids, namely: phosphoric, boric and carbonic. Such treatment, with a fire retardant consumption of about 450 - 470 g / cubic meter, allows to reduce the flammability and combustibility of wood by 80 - 82%, while at the same time providing a moderate level of smoke formation and satisfactory, relative to the toxicity of combustion products.

occurs with the help of biopyrenes; until recently, copper sulfate played the main role in domestic production realities.

Treating wood with an antiseptic or fire-retardant composition in the conditions of domestic construction of a bathhouse was reduced to applying the solution to the protected surface using a brush, roller or pneumatic sprayer. How effective is it?



Processes of salting out and washing out iceland mobile database compounds from solid wood
The main components of wood fiber are cellulose and lignin. Salts of mineral acids are foreign to wood in their chemical composition and do not create stable molecular bonds as a result of interaction. In addition, the penetrating ability of such compositions is very low; when processing even wood with a porous structure, it is not possible to obtain a processed layer depth of more than 5 mm. However, even this is not all.

Both wood and mineral acid salts are hygroscopic substances that actively absorb both surface and atmospheric moisture, which is present in the environment in the form of water vapor. This feature leads to active migration of the active substance of the fire retardant to the surface of wooden elements of the bathhouse structure and the appearance of so-called "efflorescence". Ultimately, the salts either take the form of an aerogel, or simply crumble or are washed away as a result of exposure to general atmospheric phenomena.

Thus, there is every reason to believe that antiseptic treatment of wood by surface application can provide no more than 2 fire protection groups when using classic salt compositions.

Autoclave deep impregnation technology
Based on the above, it can be assumed that double-sided treatment of boards with an antiseptic, having a thickness of about 25 mm, can give an acceptable effect, but treatment of timber with an antiseptic, which performs the function of a key load-bearing element in the construction of a bathhouse, seems ineffective and irrational.