Product Description: Technical data: Fireproof A grade (GB8624) Density 0.96-1.03g/cm3 (GB/T7019-1997) Intensity of bending resistance when dry 18Mpa (GB/T7019-1997) Intensity of bending resistance when moisture-saturated condition 22Mpa (GB/T7019-1997) The rate of deformation when pick up the moisture 0.26% (GA160-1997) The shrinking rate when heated 1.0% (GA160-1997) Water permeability There is no drop of water to emerge in the back (CNS 13778) Impact resistance No carck,strip and run through (CNS 13778) Thermal resistance 1.14m2K/W (GB/T13475-92) Sound insulation >44db (GBJ121-88) Security 100%no asbestos. Product Details: Mgo Board,Magnesium Oxide Board [PDF Download] Placas MgO–Elespañol[PDF Download]