... face 3.Sound absorption,easy installation ,deadening... Specifications high strength, freeze-proof, water-proof, fiber-proof, sound- ... station etc. The size600x600x5mm-6mmMaterials: Tobermorite, cement, Quartz sand, reinforced fiberFire-proof rate: A-class incombustible (GB8624-1997 ... /MK (Jc/t564) AverageSound-proof: 45db (GBJ75-84)Anti-bend strength: >16MPa (GB/T7019-1997)Moisture movement rate: <0 ...