tolerance:-0.1,0.2 core:poplar,pine,birch,hardwood glue:WBP,MR,E1,E2 usage;construction 1> if used abide by the illustrations strictly, it can be reused many times. 2> reducing the cost greatly and avoiding the disadvantage:restily and erosive of iron mould. 3>.solve the problems of leaking and rough surface during constructing process 4>.realizing a higher economic profies. 5>.new technology and ...