why is calcium sulphate hemihydrate called plaster of paris
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Plaster of Paris stands for calcium sulphate hemihydrate, which is obtained by heating the mineral, gyspum. ... Paris then had rich deposits of gyspum, which was heated in large quantities to manufacture plaster and make it strong enough to withstand weight of massive buildings and hence the name, 'Plaster of Paris '.
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When gypsum which is a soft sulfate mineral, made out of calcium sulfate dihydrate, is heated to 300 degrees F, it becomes a dry powder. Next, when water is added, it re-forms into gypsum. It takes 10 minutes to set and 45 minutes to dry. Gypsum is derived from the Greek word (gypsos) meaning plaster. In the quarries in Montmartre, Paris, this gypsum has been mined to make into plaster of Paris. The mineral gypsum is the second softest on the Mohs scale of hardness. Gypsum is used in plaster of Paris for modeling, molding and even in surgical splints, and dental impressions. Wallboard is made of gypsum in construction.