Kunming Xishuangbanna anti-corrosion wood manufacturers tell you how to classify the anti-corrosion wood?
Answer: Material grade: (1) Super-grade side is not knotted (A-level), first-level less-tree section (A-level + B-level), second-level tree section is all live-knot (B-level), ordinary price is economical and practical (C-level) structure Concealed part of Grade 1 structure. Anti-corrosion grade: Grade A can be used in water, soil or concrete. Class AB can be used above the surface. M-Class can be used in sea water.