It is made from good electric melting quartz sand, broken by airflow disintegrator or vibration machine and processed by grade machine. Main compositionsSiO2≥99.8%-99.9%, Fe2O3≤0.005-0.01%. The product is of high purity and low expanding rate. The annual output is 5,000 tons.Granularity rangeFrom 325 meshes to 3,000 meshes. It can be produced as requested. It is used in plastic enveloping materials for GSI, epoxy resin casting materials, enveloping materials, silicon rubber and fireproof materials.