1.1 This classification covers fired refractory brick and shapes consisting predominantly of zircon (ZrO2SiO 2) and containing, by chemical analysis, not less than 60 % zirconium oxide (ZrO2) and not less than 30 % silica (SiO 2).
ASTM
Standard Classification of Zircon Refractories
STD-64060
1997
2007-10-01
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