Fused silica (grains & powder) and crystalline silica ( sand & powder) , which are widely used as materials for investment casting , refractory , ceramics , artificial marble , epoxy molding compound (emc filler), paints, coating, foundry industries etc. Our products includes : 1. Fused silica grains / fused micro silica powder sio2: 99.9%min fe2o3 : 15ppm max -50ppm max, particle size: a : 3-100mm , 5-50mm, 8-5mm , 5-3mm , 3-1mm , 1-0.5mm , 0-0.5mm , 0.5-0.2mm , 0.2-0.1mm , 0.5-1mm b : - 4+10mesh , -10+20 mesh , -10+30 mesh , -30+50 mesh , -50+100mesh , -120f , -325f, -400f, -600f or in accordance with customer's request . 2. Crystalline silica sands / crystalline micro silica powder sio2 : 99.5% min-99.98%min fe2o3 : 5ppm max-30ppm max, particle size: 2-4mesh , 4-6mesh , 6-10 mesh , 10-20 mesh , 20-40 mesh , 40-80mesh , 80-200mesh , -100mesh , -200mesh , -325mesh , 400mesh , 600 mesh.