prov:value
| - Useful refractory materials include compounds of aluminum, calcium, chromium, magnesium, silicon, titanium, zirconium and the like, such as aluminum oxide, calcium oxide, magnesium oxide silicon oxide, titanium oxide, zirconium oxide, aluminum silicate, calcium silicate, magnesium silicate, silicon carbide, zirconium carbide, alumina silica fiber and the like.
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