Plaster of Paris, also known as quick-setting gypsum plaster, consists of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry.
Plaster of Paris is produced by heating the gypsum up to 150 oC to remove 75% of its combined water, to form a dry powder of calcium sulfate.
It is used for model making, making moulds for slip casting ware.
Plaster of Paris is a building material that is used as a protective coating on walls and ceilings. It is also used to make sculptures, historical monuments and metal castings for decorative purposes in buildings, and create complex detailing in room interiors.
In medical uses, Plaster of Paris is used in orthopaedics to put casts around fractured bones. This stiff casts will help the bone heal and be restored.