what is plaster paris
Definition of plaster of paris. : a white powdery slightly hydrated calcium sulfate CaSO4Â·1â2H2O or 2CaSO4Â·H2O made by calcining gypsum and used chiefly for casts and molds in the form of a quick-setting paste with water.
PLASTER OF PARIS Recipe. Plaster of Paris is a Calcium sulfate semi-hydrate (CaSO4,Â½ H2O) derived from Gypsum, a calcium sulfate di-hydrate (CaSO4, 2H2O), by firing this mineral at relatively low temperature and thus reducing it to powder. CaSO4, 2H2O + HEAT -------> CaSO4, 1/2 H2O + 1.5 H2O.