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How is gypsum prepared from plaster of paris?

April 26, 2017gypsum Paris plaster prepared

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How is gypsum prepared from plaster of paris?

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When mixed with water (1/3 of its mass), plaster of paris evolves heat and quickly sets to a hard porous mass within 5 to 15 minutes. During setting, a slight expansion (about 1%) in volume occurs so that it fills the mould completely and takes a sharp impression.