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Plaster of paris & gypsum

Dead burnt plaster is formed when gypsum is heated to


When gypsum is heated at about 393 K it gets converted to plaster of Paris.

If the temperature becomes greater than 393 K, gypsum loses all the water of crystallization . Setting property is lost. Anhydrous CaSO4 so formed is called “Dead burnt plaster” (or) “Dead burnt gypsum”.

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