... &22, 1987. Radioactivity: GB65662001 A ClassFiber Cement Board is a superior, weather resistance, pre-finished, architectural ... produced from a mixture of cement, silica sand, special cellulose, fibers and synthetic cement silica binder to impart durability ... floor, Counter fort, furniture scale board and fireproofing door scale board . Access flooring, desktop board, billboard, goods chest and ...