The strength of a gypsum investment is dependent on_______________?
Correct answer: C. Gypsum
- A. Carbon content
- B. Silica content
- C. Gypsum
- D. Copper
Explanation
The gypsum binder is the principal source of strength in a gypsum-bonded investment, while silica mainly provides refractory behaviour and thermal expansion. Its strength is also influenced by the water-to-powder ratio, but gypsum is the best listed choice.
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