The setting of zinc phosphate may be retarded by ?
Correct answer: D. Decrease the addition of powder to liquid
- A. Increased in the ratio of powder to liquid
- B. Diluting the liquid with water
- C. Increase the addition of powder to liquid
- D. Decrease the addition of powder to liquid
Explanation
Reducing the powder-to-liquid ratio retards zinc phosphate cement by leaving more acid liquid to react and producing a less concentrated mix. Increasing the powder ratio generally accelerates setting and raises strength, provided it remains workable.
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