Xuzhou Fengbao Mining Co. Ltd. is a major manufacturer of silica (quartz) products such as quartz stone, high purity silica sand, silica powder, microsilica powder, crystal powder and fused silica lump and powder, quartz tube, 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 (Silica) Sand powder and stone high purity grade: SiO2:99.60%min-99.98%min ; Fe2O3 :1-35ppm Max.; size:2-200 mesh refined grade: SiO2 :99.50%min-99.90% min ; Fe2O3 : 50-300ppm Max.; size:2-325 mesh General grade:SiO2 :98.00%min-99.50% min ; Fe2O3 : 400 -1200ppm Max.; size:2-400 mesh 2. Quartz (Silica) Stone special grade: SiO2: 99.96%min; Fe2O3: 4ppm Max. 1st grade: SiO2: 99.90%min; Fe2O3: 40ppm Max. 2nd grade: SiO2: 99.80%min; Fe2O3: 100ppm Max. 3rd grade: SiO2: 99.60%min; Fe2O3: 300ppm Max. 3. Fused Quartz (Silica) lump1st grade: SiO2: 99.9% min; Fe2O3: 30ppm Max.2nd grade: SiO2: 99.8% min; Fe2O3: 60ppm Max.3rd grade: SiO2: 99.7% min; Fe2O3: 100ppm Max.4.Fused Quartz (Silica) Powder 1st grade: SiO2: 99.9% min; Fe2O3: 30ppm Max. 4-2000mesh as per buyer's spec.2nd grade: SiO2: 99.8% min; Fe2O3: 60ppm Max. 4-2000mesh as per buyer's spec.3rd grade: SiO2: 99.7% min; Fe2O3: 100ppm Max. 4-2000mesh as per buyer's spec.4rd grade SiO2: 99.5-99.6% min; Fe2O3: 150-300ppm Max.4-2000mesh as per buyer's spec.5. Microsilica Powder (1) SiO2: 99.90%min; Fe2O3: 10ppm Max.; Al2O3 :50ppm Max; size:300 mesh (2) SiO2:99.80%min; Fe2O3: 50ppm Max.;Al2O3 :50ppm Max;size:400 mesh (3) SiO2:99.70%min; Fe2O3:100ppm Max.;Al2O3 :60ppm Max; size :600 mesh 6.NATURAL CRYSTAL POWDERSiO2: 99.90%min-99.99%min , size:2-300 mesh 7.QUARTZ TUBE
