In general, in addition to a small amount of natural preservative wood, the industry now calls the vacuum pressure treated coniferous wood preservative wood, which can be used in the natural environment for 20-50 years; Some use other methods, such as brushing, soaking and so on, which are temporary but not permanent, can not achieve the real anti-corrosion effect;
Difference method: after sawn by drying wood pressure treatment, some preservatives of sapwood will be soaked 85% - 100% (but oil wood and heartwood will be more difficult to soak); After sawing, more than 50% of the cross-section of wet wood treated by direct pressure presents the nature of wood (especially when the cross-section is more than 50 mm), and it can not be used to soak the wood cells, but the similar coloring effect of brushing and soaking can not be called real preservative wood; ACQ pressure wood is dark green, CCA pressure wood is gray green.
It is worth noting that some domestic factories choose non drying plates for anticorrosion in material selection
1、 The state has not imposed any regulations
2、 The company does not have kiln drying equipment or the concept of kiln drying.
3、 Speed up the production cycle.
4、 One less process can reduce a lot of cost.
5、 Some domestic design units are seriously out of touch with the industry, designing some non-standard works, and the engineering side has no habit of ordering, so the delivery time is often very short. In order to meet such customers, some factories cut corners and simplify the production process, so as to obtain orders;
The direct result of simplifying the production process is that the connotation quality of the preservative wood can not be guaranteed, and the appearance will show severe cracking, warping, large shrinkage, blackening and even pedantic appearance after construction