Fused Silica Powder for Investment Casting
High-purity fused silica powder for investment casting, refractory, ceramic and epoxy applications. Produced from selected crystalline silica through high-temperature fusion, with low thermal expansion, excellent thermal shock resistance and multiple particle-size options available.
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 Silica Powder
Changtong fused silica powder is produced from selected high-purity crystalline silica through high-temperature electric fusion at approximately 1800–2000°C. During the fusion process, the crystalline structure is transformed into amorphous silica, after which the material is processed and classified into different granular and powder grades.
With its low thermal expansion, good thermal stability and excellent thermal shock resistance, fused silica is widely used in investment casting, refractory materials, ceramics, foundry applications, epoxy molding compounds and other industrial systems requiring stable performance at elevated temperatures.
Available forms: fused silica powder, fused silica flour, fused silica sand and customized particle-size grades.
Key Properties of Fused Silica
- Low Thermal Expansion: Helps improve dimensional stability during heating and cooling cycles.
- Excellent Thermal Shock Resistance: Suitable for applications exposed to rapid temperature changes.
- Amorphous Silica Structure: Produced by high-temperature fusion of selected crystalline silica.
- Multiple Particle Sizes: Powder, mesh and granular grades are available for different processing requirements.
- Stable Industrial Performance: Suitable for precision casting, refractory, ceramic and resin-based applications.
- Customizable Specifications: Particle size and selected chemical specifications can be discussed according to customer requirements.
Available Particle Sizes
Different industrial processes require different particle-size distributions. Changtong can supply fused silica in granular, mesh and powder forms.
Fused Silica Sand / Granular Sizes
| Available Size | Product Form |
|---|---|
| 1–2 mm | Fused Silica Sand |
| 2–4 mm | Fused Silica Sand |
| 4–8 mm | Fused Silica Granules |
| 8–16 mm | Fused Silica Granules |
| 16–32 mm | Fused Silica Granules |
Fused Silica Powder / Mesh Sizes
| Available Mesh | Typical Form |
|---|---|
| 10–20 mesh | Coarse |
| 20–40 mesh | Coarse |
| 40–80 mesh | Medium |
| 100–120 mesh | Fine |
| 200 mesh | Fine Powder |
| 325 mesh | Fine Powder |
Other particle-size ranges and chemical requirements can be discussed according to customer specifications.
Technical Specifications
The exact chemical and physical specification depends on the fused silica grade selected. Please use the product specification fields in the Changtong product database for the confirmed values of each grade.
| Property | Specification |
|---|---|
| SiO₂ | According to product grade |
| Fe₂O₃ | According to product grade |
| Al₂O₃ | According to product grade |
| Particle Size | Multiple mesh / granular options |
| Product Form | Powder / Flour / Sand / Granules |
| Customization | Available upon request |
Note: Please contact Changtong for the current technical data sheet of the specific fused silica grade required for your application.
Fused Silica Applications
Fused silica is used in a variety of industrial applications where low thermal expansion, thermal stability and refractory performance are important.
- Investment Casting: Used in precision casting and refractory shell systems.
- Refractory Materials: Suitable for high-temperature refractory formulations and components.
- Ceramics: Used in technical ceramics and other silica-based ceramic systems.
- Foundry: Used where controlled thermal characteristics are required.
- Epoxy Molding Compounds: Used as a silica filler in selected resin and molding systems.
- Fusion-Bonded Epoxy: Suitable for selected coating and resin applications.
Why Fused Silica for Investment Casting?
Investment casting processes place demanding requirements on refractory materials. Dimensional stability during heating, resistance to thermal shock and controlled particle characteristics all influence shell performance and casting quality.
The low thermal expansion and thermal stability of fused silica make it suitable for precision investment casting applications. Different mesh and particle-size grades can be selected according to the customer's shell-building process and formulation requirements.
Customized Fused Silica Solutions
Not every customer requires the same fused silica specification. Changtong can discuss product selection according to particle size, chemical composition, application and processing requirements.
When requesting a quotation, we recommend providing:
- Required product form: powder, flour or sand
- Required mesh or particle size
- Target chemical specification
- Application or production process
- Estimated order quantity
- Packaging requirements
Packaging & Shipping
Standard fused silica packaging options include 25 kg bags and 1000 kg bulk bags. Customized packaging can also be discussed according to customer requirements.
- Standard bag: 25 kg/bag
- Bulk bag: 1000 kg/bag
- Container loading: approximately 20–25 MT per 20-foot container, depending on product and packaging configuration
- Customized packaging: available according to order requirements
The existing product documentation describes fused silica as non-dangerous goods that can be transported as ordinary cargo. Final shipping classification and documentation should be confirmed for the current product, destination and applicable transport requirements.
Quality & Production Control
Changtong focuses on raw material selection, processing, particle-size classification and product specification control for industrial silica materials.
For fused silica products, the appropriate grade should be selected according to the customer's application and required chemical and physical parameters. Current technical data, quality documents and available specifications can be provided according to the product grade and order requirements.
About Changtong
Lianyungang Changtong Silica Powder Co., Ltd. was established in 2009 and specializes in silica powder and related silica materials for industrial applications.
Our product portfolio includes crystalline silica powder, fused silica powder, cristobalite, coating-grade silica materials, electrical and electronic-grade silica powder, high-purity silica materials and related quartz products.
We support customers with different particle sizes and product specifications according to their application requirements.
Frequently Asked Questions
What is fused silica?
Fused silica is an amorphous form of silicon dioxide produced by melting high-purity crystalline silica at high temperature and cooling it into a non-crystalline structure.What is fused silica powder used for?
Typical applications include investment casting, refractory materials, ceramics, foundry products, epoxy molding compounds and selected coating systems.What particle sizes are available?
Changtong supplies fused silica in multiple granular and powder sizes, including millimeter grades and mesh sizes such as 10–20, 20–40, 40–80, 100–120, 200 and 325 mesh. Other requirements can be discussed.Can you customize fused silica particle size?
Yes. Particle-size requirements and selected chemical specifications can be discussed according to the customer's process and application.What packaging is available?
Typical packaging includes 25 kg bags and 1000 kg bulk bags. Customized packing can be discussed according to order requirements.Can I request a sample before placing an order?
Sample availability depends on the required grade, particle size, quantity and destination. Please contact us with your technical requirements.Request a Quote
Looking for fused silica powder or fused silica sand for investment casting, refractory, ceramic or other industrial applications?
Send us your required particle size, chemical specification, application and estimated quantity. Changtong will help you evaluate the appropriate fused silica grade for your process.
Request a Quote
