... water treatment filtration, exact foundry, refractory, ceramic, casting, printing, dyeing, quartz melting, petroleum, chemical, abrasive, etc, Silicon content is very high ... and very low iron, sodium, chloride, silica content of 99.9%,alumina 300ppm, 20ppm iron as the ... oxide for the 10ppm maximum.we can supply different sizes quartz grain,welcome to contact us for the further details. ...