Analysis of information sources in references of the Wikipedia article "Plaster" in English language version.
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Hardening stage of plaster of paris is basically a crystalline change in which orthorhombic form of gypsum converts into the monoclinic form of gypsum.
Hardening stage of plaster of paris is basically a crystalline change in which orthorhombic form of gypsum converts into the monoclinic form of gypsum.
The long experience in the manufacture of plaster of Paris presents a consistent record that whenever gypsum is heated at not too high a temperature–usually about 130°–the product formed is invariably the hemihydrate; and further, that if the temperature is permitted to go considerably higher, the product becomes 'dead burned', it has then been converted into anhydrite.