Silica sol__________________?
Correct answer: B. Increase the strength and the setting expansion of the phosphate-bonded investment
- A. Is applied to the walls of the investment to produce hygroscopic expansion
- B. Increase the strength and the setting expansion of the phosphate-bonded investment
- C. Acts as a retarder in the silica bonded investments
- D. Acts as a refractory in the Silica bonded investments
Explanation
Silica sol is the liquid component commonly used with phosphate-bonded investments, where it increases strength and contributes to setting expansion. It is not itself the refractory material in silica-bonded investment.
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