Gypsum bonded investment should not be heated over______________?
Correct answer: A. 700°C
- A. 700°C
- B. 1,300°C
- C. 1,063°C
- D. 900°C
Explanation
Gypsum-bonded investments should generally not be heated above about 700°C because the gypsum binder decomposes at higher temperatures and can release sulphur-containing gases. These gases may contaminate or embrittle the casting.
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