good quality,best price, prompt delivery 1. Quartz Properties: quartz is the most common silica mineral, its main content is SiO2, specific density ... 50.1 Specifications Used in Metallurgy IndustryUse & IndexSiO2Al2O3Fe2O3CaOP2O5TiO2Refractoriness Ultra Grade Silica Brick≥98.5≤0.5≤0.5≤0.51750 degree ... 70mesh, 100-200mesh, 270mesh, 325mesh, 400mesh, 500mesh, 800mesh, 1250mesh etc silica quartz 325mesh