prov:value
| - The refractory materials may be any of the usual known refractory materials in finely divided form which will fuse with the porous base fabric when subjected to elevated temperatures, e.g., above about 1750??? F., and includes compounds of aluminum, calcuim, chromium, magnesium, silicon, titanium, zirconium and the like, such as aluminum oxide, calcium oxide, magnesium oxide, silicon oxide, titant
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