Plaster of paris is quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate)
which hardens when moistened and allowed to dry.
plaster of paris is called because of its preparation from the abundant gypsum found near Paris.
Plaster of paris does not generally shrink or crack when dry, making it an excellent medium for casting molds.
It is also used in medicine to make plaster casts to immobilize broken bones while they heal, though many modern orthopedic casts are made of fibreglass or thermoplastics.
Plaster of paris is prepared by heating calcium sulfate dihydrate, or gypsum, to 120–180 °C (248–356 °F). With an additive to retard the set
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