Fused Silica Grains    Fused Silica Grains , made of F.Sil cullets , by our special processing technologies , grading , crashing , sieving , magnetic separating , to be coarse grains or fine powders for different usages . Due to Fused silicas low thermal conductivity and excellent thermal shock resistances as well as stable particle size distributions , it is widely used in Crucibles , Technical ceramics , High-grade Refractories , Investment Casting (Stucco & Slurry ) industries etc. Main Applications Fused Silica Crucible  Investment Casting & shell casting Refractory , Technical Ceramic &  glass materials Size Available : cullets , grains or powders 0-100mm, 5-50mm, 8-5mm, 5-3mm, 3-1mm, 1-0mm, 1-0.5mm, 0.5-0.2mm, 0.2-0.1mm, 0.5-0.1mm, -4+10mesh, -10+20mesh, -20+50mesh, -30+50mesh, -50+100mesh,-100+200mesh ,  -120F, -200F,   -325F,  -600F.