Fused Quartz Sand for Electrical Insulation & Refractories
High-purity fused quartz sand for electrical insulation compounds and refractory formulations. Amorphous silica with low thermal expansion, controlled granular grades and multiple particle-size options for application-specific evaluation.
Specifications
- Mesh Size
- 120mesh,200mesh,325mesh,600mesh,800mesh,1250mesh,2000mesh,2500mesh,3000mesh,5000mesh
- Particle Size
- 3-5mm,1-3mm,1-0.5mm,0.5-0.2mm,0.1-0.2mm,0.1-0mm(120mesh),0.075mm(200mesh)
- SiO₂ Content
- 99.8-99.99%
- Bulk Density
- 1.0~1.5 g/cm³
- Specific Gravity
- 2.20 g/cm³
- Thermal Expansion
- 0.5*10⁻⁶
- Moh's hardness
- 7
Fused Quartz Sand for Electrical Insulation & Refractories
Fused quartz sand is produced by melting selected high-purity quartz at elevated temperature and classifying the amorphous silica into controlled granular grades. This product is intended for buyers evaluating a thermally stable silica aggregate or filler for electrical insulation compounds, refractory mixes and other heat-resistant formulations.
Its low thermal expansion, chemical stability and clean granular form help formulators manage dimensional change during heating and cooling. Available particle-size options should be selected against the customer’s resin system, refractory matrix, processing method and final performance requirements.
Typical Physical Properties
| Property | Reference Value | Purchasing Relevance |
|---|---|---|
| Composition | SiO₂ | Silica-based mineral aggregate or filler |
| Structure | Amorphous | Created through high-temperature fusion |
| Colour | Transparent or white | Suitable for light-coloured industrial formulations |
| Melting temperature | Approx. 1750°C | Reference for high-temperature material selection |
| Specific gravity | 2.21 g/cm³ | Useful for formulation and loading calculations |
| Mohs hardness | 7 | Hard mineral phase for industrial processing |
| Thermal expansion | 0.5 × 10⁻⁶ | Supports dimensional stability during temperature change |
Reference Chemical Composition
| Component | Reference Specification |
|---|---|
| SiO₂ | >99.90% |
| Al₂O₃ | <200 ppm |
| Fe₂O₃ | <50 ppm |
| TiO₂ | <20 ppm |
| MgO | <40 ppm |
| CaO | <40 ppm |
| Na₂O + K₂O | <100 ppm |
Specification note: Values above follow Changtong’s current fused silica reference template. Final acceptance is based on the mutually confirmed grade, particle-size requirement and batch certificate of analysis.
Electrical Insulation and Refractory Applications
| Application | How the Material Is Evaluated | Details to Confirm |
|---|---|---|
| Electrical insulation compounds | As a mineral filler in insulating resin and ceramic systems where thermal stability and controlled sizing are required | Resin type, filler loading, dielectric targets and particle-size distribution |
| Refractory castables and mixes | As a silica aggregate or formulation component for heat-resistant linings and shapes | Maximum service temperature, matrix chemistry and aggregate grading |
| Technical ceramics | As a controlled silica source in ceramic bodies and engineered components | Forming method, firing profile and impurity limits |
| Coatings and silicone formulations | As a stable silica component when the customer requires granular or fine classified material | Dispersion method, target viscosity and surface requirements |
Particle-Size and Order Selection
Granular options in Changtong’s fused silica specification include 3–5 mm, 1–3 mm, 1–0.5 mm, 0.5–0.2 mm and 0.1–0.2 mm. Reference powder grades include 120, 200, 325, 600, 800, 1250, 2000, 2500, 3000 and 5000 mesh. The appropriate grade depends on packing density, flow, mixing equipment and the customer’s finished product.
- State whether the material will be used as aggregate, filler or blended grading.
- Provide the required particle-size range or screen analysis.
- Confirm chemical limits that are critical to the electrical or refractory system.
- Include trial quantity, annual demand, packaging and destination port.
Production and Quality Control
Selected crystalline quartz is fused at high temperature to form amorphous silica, then crushed and classified into the requested granular or powder range. Particle sizing and chemical composition are checked against the agreed order specification. Application performance should be validated in the buyer’s own formulation because resin chemistry, firing conditions and processing equipment can affect the final result.
Packaging and Supply
| Supply Item | Available Reference |
|---|---|
| Standard bag | 25 kg net weight |
| Bulk option | 1000 kg |
| Container reference | 20–25 MT per 20 ft container |
| Quality system | ISO 9001 |
| Country of origin | Made in China |
Frequently Asked Questions
Is this product limited to one insulation or refractory process?
No. It is supplied as a raw material for application-specific evaluation. The final grade should be selected according to the customer’s formulation and processing conditions.
Can particle size be adjusted?
Yes. Multiple granular and mesh grades are available. Include the target size range or screen distribution in the inquiry.
How should a trial order be specified?
Provide the application, required chemistry, particle size, quantity, packaging and delivery destination. Changtong can then confirm an appropriate supply specification.
Request a Quote for Fused Quartz Sand
Tell us your electrical insulation or refractory application, required particle size, chemical limits, quantity and destination. Our team will review the specification before quotation.
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