SiO2 percentage in firebrick is about____________________?
Correct answer: B. 55-60
- A. 35-40
- B. 55-60
- C. 80-85
- D. > 94
Explanation
Ordinary firebrick is usually made from fireclay and contains about 55–60% SiO2, with alumina making up much of the remainder. The higher silica ranges are associated with silica or highly siliceous refractories, not normal firebrick.
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