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ASTM C545-97 Standard Classification of Zircon Refractories
standard by ASTM International, 11/10/1997
1.1 This classification covers fired refractory brick and shapes consisting predominantly of zircon (ZrO2[dot]SiO2) and containing, by chemical analysis, not less than 60% zirconium oxide (ZrO2) and not less than 30% silica (SiO2).
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