Plaster of paris _____________?
Correct answer: B. Has porous and irregular crystals
- A. Is wet calcined hemihydrate
- B. Has porous and irregular crystals
- C. Is a - hamihydrate
- D. Has a W / P of 0.2
Explanation
Plaster of Paris is usually the beta-hemihydrate, produced by dry calcination and characterised by porous, irregular particles. The alpha-hemihydrate has denser, more regular particles and requires less mixing water.
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