Maximum alumina content in high alumina refractory can be as high as _____________ percent?
Correct answer: D. 90
- A. 30
- B. 50
- C. 70
- D. 90
Explanation
High-alumina refractories are classified by increasing Al₂O₃ content and may contain roughly 50 to 90% alumina. The upper value listed is therefore 90%.
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