... :5-50mm Calcium Silicate Board is a new green building material. With silicate and calcium materials as base and wood fiber as strengthen, ... ...etc. Used as suspended ceiling, partition, heat insulating board, base plate, external wall panel, exterior wall cladding etc ... x8'x5mm-50mm) Materials: Tobermorite, Cao, Quartz sand, reinforced wood fiberFire-proof rate: A-class incombustible (GB8624-1997) ...