Quartz is added to gypsum bonded investment to______________?
Correct answer: A. Counter balance contraction of gypsum during heating
- A. Counter balance contraction of gypsum during heating
- B. Increase the strength
- C. aid in hygroscopic expansion
- D. Increase the shelf life of investment
Explanation
Quartz undergoes thermal expansion during heating, which compensates for the contraction of gypsum in a gypsum-bonded investment. This helps maintain the mould dimensions during burnout and casting.
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