Fused Silica Powder 325 Mesh
High-purity 325 mesh fused silica powder for refractory, technical ceramics, epoxy molding compounds, electrical insulation, powder coatings, resins, foundry and precision-casting applications.
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
Fine Particle Grade for Industrial Formulations
Fused Silica Powder 325 Mesh
A versatile fine-powder grade for buyers who need the characteristic low thermal expansion and thermal stability of fused silica in a practical 325 mesh form. It can be evaluated across refractory, technical ceramic, epoxy, electrical, coating, foundry and precision-casting formulations—not only investment casting.
More Than a Casting Powder
325 mesh fused silica offers a useful balance between fine-powder handling and broad formulation flexibility. The grade is suitable for customers comparing mineral fillers for heat-sensitive or dimensionally demanding systems, while the final choice should always be confirmed through application testing.
Fine-powder appearance and particle-size consistency are important checkpoints when evaluating a 325 mesh supply.
Application Possibilities
For refractory compounds and shaped components where fused silica's thermal behavior is relevant.
For ceramic bodies and engineered ceramic formulations requiring a fine silica source.
For epoxy molding compounds, fusion-bonded epoxy and related electrical filler evaluations.
For mineral-filled coating and resin systems where particle size and thermal properties matter.
For foundry material formulations requiring fine fused silica powder.
One important application, but not the only market for this 325 mesh grade.
Why Fused Silica Is Selected
- Low thermal expansion: useful for formulations where dimensional stability under temperature change is important.
- Thermal shock resistance: a key reason fused silica is evaluated for refractory and ceramic systems.
- Low thermal conductivity: supports use in selected heat-management and insulating formulations.
- Fine-powder flexibility: 325 mesh can be considered across several filled compounds and industrial mixes.
Physical Properties
| Property | Reference Value |
|---|---|
| Composition | SiO₂ |
| Structure | Amorphous |
| Colour | Transparent or white |
| Melting Temperature | Approx. 1750°C |
| Specific Gravity | 2.21 g/cm³ |
| Hardness | 7 Mohs |
| Thermal Expansion | 0.5 × 10⁻⁶ |
Chemical Properties
| Chemical Item | Reference Limit |
|---|---|
| SiO₂ | >99.90% |
| Al₂O₃ | <200 ppm |
| Fe₂O₃ | <50 ppm |
| TiO₂ | <20 ppm |
| MgO | <40 ppm |
| CaO | <40 ppm |
| Alkalies (Na₂O + K₂O) | <100 ppm |
Reference data from the supplied grade table. For fine powder, Al₂O₃ may be affected by ball milling with alumina media. Confirm the applicable specification and batch COA before ordering.
325 Mesh Particle Size Distribution
| Screen | Opening | Reference Distribution |
|---|---|---|
| 200 Mesh | 75 μm | <3% |
| 325 Mesh | 45 μm | 4–11% |
| Pan | Below 45 μm | 86–97% |
Pan designates the percentage of fused silica passing the last reported screen for this size.
Specification note: These values are presented as reference data from the supplied product sheets. Final acceptance should follow the mutually confirmed specification and batch COA.
Material & Processing
Fused silica is produced from high-purity crystalline silica through electric fusion at approximately 1800–2000°C, forming amorphous silicon dioxide. The fused material is then classified and engineered into granular and powder grades, including 325 mesh.
Packaging & Supply
- Standard packaging: Net Weight 25 kg per bag
- Bulk packaging option: 1000 kg
- Container reference: 20–25 MT per 20 ft container
- Certification: ISO 9001
- Country of origin: Made in China
- Alternative packaging can be discussed according to purchasing requirements.
What to Include in Your Inquiry
- Application or formulation type
- Required mesh size and SiO₂ level
- Trial quantity or annual demand
- Destination port and packaging preference
Frequently Asked Questions
Is 325 mesh fused silica only for investment casting?
No. It can also be evaluated for refractory, ceramic, epoxy molding, electrical, coating, resin and foundry applications.
Can you supply other particle sizes?
Yes. Available fused silica products include multiple mesh and granular grades; confirm the required size with your inquiry.
Can I request a trial quantity?
Tell us the application, required specification and delivery destination so suitable trial arrangements can be discussed.
Is customized packaging available?
Standard options are 25 kg bags and 1000 kg bulk packaging; other requirements can be discussed.
Request a Targeted Quotation
Share your application, required grade, quantity and destination port. We will use those details to discuss the appropriate fused silica supply option.
Request a Quote
