Calcination: The Powdered gypsum is heated to remove h2o molecules, making various forms of plaster depending upon the temperature and length of heating. Hydration of Anhydrite: Gypsum may also variety from the hydration of anhydrite (CaSO₄). Anhydrite is often a calcium sulfate mineral that lacks the drinking water molecules current https://www.propanraya.com/id/produk/eco-gypsum-ee-4050