Fused Silica (Fused Quartz), application refractory ,foundry, casting etc. Fused Silica (Fused Quartz), application refractory ,foundry, casting etc. 1st type :SiO2 99.8% MinFe2O3 100ppm ... : 0-45 um (D=12 um) powder sidedApplication: Casting, Foundry, Refractory