A serious flaw in wood is decay. The wood is under corrosive conditions and can be destroyed in 3 to 5 years. If it is handled well, it can not be decayed for a long time. For example, the wooden structure of the millennium or more left over from ancient China is proof.
The cause of wood decay is the damage of wood rot fungi, a minimal plant.
Wood rot fungi breeding conditions:
1. Moisture, wood rot fungi secretase enzymes use water as a medium to decompose wood itself into sugar for nutrition, and the wood moisture content is the most decaying when it is 30%~50%;
2. Air; 3. Temperature 10~30. For example, the pile is completely immersed in water, and the water content exceeds 100%, so it is extremely rot, which denatures the wood and loses its physical properties.
The most important method of preserving wood is to reduce the water content. Under the general moisture content of 18%, the wood rot fungus cannot be propagated. At the same time, the wood should be ventilated to avoid moisture. If the ventilation is not good, the same humidity of the air should be kept at 80~100%, and the wood rot fungus can grow.
For direct damp wood products to be coated or soaked with preservatives, the preservatives are toxic, so that wood rot fungi can not breed and survive. The most commonly used preservatives are coal tar (commonly known as odor oil, a by-product of coking), or a 3% aqueous solution of sodium fluoride.
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