Calcination: The Powdered gypsum is heated to get rid of water molecules, creating different sorts of plaster depending on the temperature and duration of heating. Pure gypsum is mined from geological deposits. These deposits are generally found in sedimentary rock formations developed by the evaporation of historic seas. Organic gypsum https://www.propanraya.com/id/produk/eco-gypsum-ee-4050
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