Gyprock Supaceil is a fibre-reinforced plasterboard specifically designed for ceilings where framing members are spaced at 600mm centres, to reduce the risk of sagging and to maintain ceiling flatness. Supaceil features Gyprock's patented Controlled Density (CD) technology; a unique manufacturing process which manipulates the core structure of plasterboard. This creates greater strength, lighter weight and superior paper to core bonding.