Fused silica (fused quartz sand / fused quartz powder) is high-purity amorphous silica material. It is made from natural quartz, melted under high temperature in electric arc furnace, then cooled, crushed and sieved. It features ultra-low thermal expansion coefficient, excellent thermal shock resistance, high temperature resistance, good chemical stability and great resistance to acid and alkali corrosion.
Key Features：
- Extremely low thermal expansion coefficient, excellent thermal shock resistance, resistant to cracking under rapid temperature change, stable dimension at high temperature.
- High purity silica (SiO₂ ≥99.5%~99.99%) with low impurity content.
- Great high-temperature resistance, softening point around 1650℃, long-term service below 1100℃.
- Outstanding chemical inertness, resistant to acid corrosion, not attacked by most chemicals except HF and strong hot alkali.
- Superior electrical insulation even under high temperature.
- Low thermal conductivity, good heat insulation performance.
- Available in grain and powder grades, widely used in refractory castables, precision investment casting and advanced ceramics.
Available Grades：
Standard Grade SiO2≥99.50%
High Purity Grade SiO2≥99.90%
Main Applications：
-Refractory industry: Raw material for monolithic refractory castables, precast blocks and furnace linings, widely used in glass kilns and metallurgical furnaces.
-Precision investment casting: Face coat and backup refractory powder for silica sol casting process.
-Ceramics: Raw material for special ceramics and electronic ceramics.
-Others: Optical materials, filler, high-purity raw materials for semiconductor industry.
Available Sizes & Packing：
Standard sizes:0‑1mm,1‑3mm,3‑5mm,200mesh，325mesh and other powder.
Sizes can be customized upon request.
Packing: 1/1.25 MT ton bags, 25 kg bags or on request.
COA certificate supplied per shipment.
Specification:
Chemical Composition | Standard Grade | High Purity Grade |
SiO₂ | 99.50%min | 99.90%min |
Fe₂O₃ | 0.03%max | 0.01%max |
Al₂O₃ | 0.20%max | 0.05%max |
LOI | 0.10%max | 0.05%max |
*Specifications and Sizes can be customized upon request.
Available Sizes & Packing：
Standard sizes:0‑1mm,1‑3mm,3‑5mm,200mesh，325mesh and other powder.
Sizes can be customized upon request.
Packing: 1/1.25 MT ton bags, 25 kg bags or on request.
COA certificate supplied per shipment.