Calcium sulfate is an inorganic compound with the formula CaSO4. It has hygroscopic properties, giving it the ability to induce dryness by absorbing water. Calcium sulfate is the main ingredient in moldable Plaster of Paris which is used for ornamental plaster work. It is manufactured in a white solid form and is also used as a food additive for it coagulation properties such as holding Tofu in a more solid state. It is also permitted by the FDA for use in jellies, cheese, condiments, and bakery products.
Calcium Sulfate occurs naturally in gypsum which is globally mined as a natural mineral resulting from the evaporation of water. When used in the manufacture of gypsum drywall products, Calcium Sulfate reduces structural damage with endothermic properties that acts to cool the wall as water is lost. It is also a byproduct of many manufacturing processes including the production of phosphoric acid and in the exhaust gases from fossil-fuel power generation.