tell me abt plaster of paris? | Yoo Answers
Dec 17, 2007· Plaster of Paris, or simply plaster, is a type of building material based on calcium sulfate hemihydrate, nominally CaSO4· It is created by heating gypsum to about 150 °C. 2CaSO4·4H2O → 2CaSO4·H2O + 3H2O (released as steam).