Gypsum is a very soft sulfate mineral composed of Calcium Sulfate Dehydrate, with the chemical formula. 50Kg PP Bags or as per our valued customer demand USES OF GYPSUM Fertilizer and soil conditioner A component of Portland cement used to prevent flash setting of concrete Manufacturing plaster of Paris Gypsum board is primarily used as for walls and ceilings, and is known in construction as drywall or plasterboard.