Supermarket shelves compared with the plate, which environmental protection?
The main reason for wood cracking and deformation is that moisture content is too high or too low. Finally, when buying, do not just figure cheap, low-priced materials are usually shoddy and formaldehyde exceeded the standard material, should go to the formal market to buy, it is best to buy a brand of materials.
Secondly, the moisture content of wood should be observed. When the moisture content of wood is higher than the equilibrium moisture content of the environment, the wood will dry and shrink, and vice versa.
Buy Timber first depends on whether environmental protection, according to regulations, wood formaldehyde emissions must be less than or equal to 1.5 mg per liter, if more than 5 mg per liter, that is substandard.
