With increasing alumina content, the fusion point of high alumina refractories__________________?
Correct answer: D. Increases
- A. May increase or decrease; depends on its alumina content
- B. Decreases
- C. Remain constant
- D. Increases
Explanation
Increasing alumina content generally raises the refractoriness and fusion point of alumina-silica refractories. Alumina is itself highly refractory, so high-alumina compositions withstand higher temperatures than ordinary fireclay.
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