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SiO2:99.5%min-99.0%min,Fe2O3:0.02%max,Al2O3:0.3% max, size:200-2000 目, 贵州利坤矿业有限公司外观为灰色或灰白色粉末﹑耐火度>1600℃。容重:200~250千克/立方米.