water and damp proofThrough being proved, the board still keeps intact after being soaked in water for one month, the phenomenon of swelling and out of shape will not happen. Out of shape rate in the condition of wet or dry is 0.26%, and absorb water is abou 15%. Especially intensity of break in the condition of dry ID 18Mpa, in the condition of picking up the moisture is 22Mpa, namely the intensity of break is higher when in wet.(3)Sound insulation95mm insulate against sound wall can up to fou