Ceramic fused sand is a kind of fused ceramic sand,it is made from calcined bauxite with main content aluminium oxide processed by melting,blowing,sieving and blending.
Ceramic fused sand Physical and Chemical Composition
| Chemical Analysis[%] | |
| Al2O3 | 70-73 |
| SiO2 | 8-20 |
| Fe2O3 | ≤3 |
| TiO2 | ≤3.5 |
| CaO | ≤0.45 |
| MgO | ≤0.35 |
| K2O | ≤0.33 |
| Na2O | ≤0.08 |
| Physical Properties | |
| Grain shape | Spherical Ball |
| Roundness | 90% |
| Refractoriness: | ＞1790℃ |
| Shape Coefficient | ≤1.1 |
| Thermal Expansion Ratio | 0.13%（Heated up for 10 min at 1000℃） |
| Thermal expansion coefficient | 6×10-6 /℃(20-1000℃) |
| Thermal conductivity | 0.698W/M.K(1200℃) |
| Specific Gravity:: | 1.95-2.05g/cm3 |
| Bulk density(LPD): | 3.4 g/cm3 |
| Color: | Black |
| AVAILABLE SIZES | |
| AFS25-35,AFS35-45,AFS45-55,AFS55-65,AFS60-70,AFS70-80,AFS95-110 Customized sizes are available upon request | |
Advantages of Ceramic Fused Sand as Foundry Material
Ceramic fused sand, also known as spherical fused ceramic sand, is widely used in foundry to replace silica sand, chromite sand and partly zircon sand. Its key advantages are:
1. High Refractoriness & Thermal Stability
- Refractoriness above 1800°C, much higher than common silica sand
- Resists high-temperature sintering and softening
- Effectively prevents burn-on, penetration, and veining defects
- Ideal for carbon steel, alloy steel, high manganese steel, and heavy castings
2. Extremely Low Thermal Expansion
- Thermal expansion rate is only about 1/6 to 1/10 of silica sand
- Minimizes mold and core deformation during pouring
- Improves dimensional accuracy and reduces swelling defects
3. Perfect Spherical Shape
- Improves flowability and compactibility for complex cores and cavities
- Ensures high permeability, reducing blowholes, gas porosity and scabbing
- Smooth casting surface finish
4. Lower Binder Consumption
- Smaller specific surface area due to spherical shape
- Reduces resin or sodium silicate usage by 30%–50%
- Lower gas evolution, fewer gas-related defects
5. Excellent Collapsibility & Easy Cleaning
- Maintains granular structure after casting, does not pulverize
- Easy shakeout and cleaning, especially for complex inner cavities
- Reduces labor cost for finishing
6. High Reusability & Eco‑friendly
- High mechanical strength, resistant to crushing during recycling
- Reclamation rate can reach over 90%
- Greatly reduces waste sand discharge and environmental load
7. Wide Compatibility
- Resin sand (furan, phenolic)
- Sodium silicate sand
- Precoated sand
- Lost foam / V‑method casting
- 3D printed sand moldsSuitable for almost all foundry processes