A thinner mix of a gypsum bonded investment will_______________?
Correct answer: B. Decrease setting expansion
- A. Produce a smoother casting
- B. Decrease setting expansion
- C. Increase setting expansion
- D. Increase thermal expansion
Explanation
A thinner gypsum investment mix contains more water, which increases porosity after drying and reduces the effective gypsum concentration. This lowers setting expansion as well as strength.
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