... in the water forone month, it keeps its original shape, without deformation or expansion, itsdry-wet deforming ratio ... hydroscopic is heavy, it is apt to out of shape.3. the board is taken as rigidity, it ... of water, afraid of damp, and out of shape seriously when being stained by water1 .The thickness above ... to bear the damp well, not out of shape, anti-halogen.3.can stick to, cut down, nailing, gluing ...