Plaster mix____________?
Correct answer: D. All of the above
- A. Rapid spatulation results in decreased setting time
- B. 2% potassium sulphate is accelerator
- C. Citrates are retarders
- D. All of the above
Explanation
Rapid spatulation increases the number of crystallisation nuclei and shortens setting time. Potassium sulphate accelerates gypsum setting, while citrate salts retard it, so all three statements are correct.
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