How much of alumina in weight percent is added to silica refractories?

How much of alumina in weight percent is added to silica refractories? Correct Answer 0.2 – 1.0

Under the presence of alumina, silica refractories show a negative effect. Therefore they are limited to 0.2 – 1.0 wt %. These refractories are generally resistant to silica-rich slags.
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