Xuzhou fengbao mining co. Ltd. is a major manufacturer of silica(quartz)products such as high purity silica sand, silica powder, micro-silica powder,(crystal)powder and fused silica lump and powder,quartz tube,natural crystal powder ,crystal wares, etc. These products are widely used as materials for(optical)glass, optical fiber, electrical, electronic, semiconductor, epoxy molding compound(emc), paint, coating, ceramic, chemical, building, foundry, precision casting, refractory and abrasives industries etc. The detailed specifications are as follows: 1. Quartz sand(silicasand) High purity grade: Sio2:99.95%min-99.8%min fe2o3:3ppm max-30ppm max, size:2-200 mesh high purity silica sand, quartz stone Deliberated grade: Sio2:99.8%min-99.0%min fe2o3:50ppm max-0.03% max, size:2-325 mesh 2. Natural crystal powder Sio2:99.90%min-99.99%min, size:2-300 mesh 3. Fused quartz ingot Sio2:99.9%min fe2o3:50ppm max, al2o3:0.03% max, size:5-100 mesh 4. Quartz in lump Special grade: Sio2:99.9%min, 1st grade: Sio2:99.8%min fe2o3:0.004%max 2nd grade: Sio2:99.7%min fe2o3:0.008%min 3rd grade: Sio2:99.5%min fe2o3:0.03%min. 5. Micro-silica powder Sio2:99.5%min-99.0% min, fe2o3:0.02%max, al2o3:0.3% max, size:200-800 mesh 6. Fused quartz powder Sio2:99.9%max, fe2o3:50ppm max, size:2-325 mesh 7. Quartz tube: Clear fused quartz tubing, ozone-free or germicidal quartz tubing, uv-block quartz tubing. 8.quartz wares and crystla wares