The term _______________ plaster is used to indicate plaster of Paris with retarder.

The term _______________ plaster is used to indicate plaster of Paris with retarder. Correct Answer Hemihydrate Gypsum

On heating the hemihydrate gypsum, temperature of about 200°C, the entire water of crystallization is driven off and the resulting product is known as gypsum anhydride or hard burnt plaster. The setting time of the Gypsum anhydride is more and to shorten it, the accelerators added to it.
Bissoy MCQ

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