... .6. intensity low, poor to be able to bare climate, afraid of being collided, afraid of water, afraid of damp, and out of shape seriously when ... that is not fired.2 expansion of coefficient is about 8/10000, absorbing water rate of is slight high (absorbing water rate ... the board is taken as rigidity, it is unable to do various types of modeling crookedly.4. general construction way only being taken ...