... water resistance,non deforming Product Data:Materials: Tobermorite, Portland cement, Quartz sand, Paper plugDensity: ≥ 1300 kg/m3Flexural ... &22, 1987. Radioactivity: GB65662001 A ClassFiber Cement Board is a superior, weather resistance, pre-finished, ... cement, silica sand, special cellulose, fibers and synthetic cement silica binder to impart durability, toughness and water resistance. The board ...