Ceramic sand for lost foam is fused ceramic sand with high refractoriness. In the meantime, for its spherical shape, ceramic sand could recycle used for up to 10 times. Instead of silica sand in traditional lost foam casting(green sand casting), ceramic is a cost-effective sand which is also environment friendly and better for the operator’s health.
Size for Lost foam casting ceramic sand:
Mainly 20-30 mesh or AFS 25-35, others including:8-15 mesh,10-20mesh
Casting Ceramic Sand characteristics:
1. Low thermal expansion coefficient
1. Spherical shape, good flowability, easy to shakeout
2. Smooth surface, compact structure
3. Chemically neutral material
4. High-temperature resistance, good refractoriness
5. Recycle up to 10 times, highly cost-effective.
6. Save resin consumption with casting tech such as shell molding, Resin coated sand casting, Vacuum casting, etc.
Performance comparison of ceramic foundry sand, Chromite sand, and Zircon Sand:
| Index | ceramic foundry sand | Chromite sand | Zircon Sand |
| PH value | 7.65 | 4.56 | 8.24 |
| Bulk Density(g/cm3) | 1.95-2.05 | 2.9-3.1 | 2.6-2.7 |
| True density(g/cm3) | 3.4 | 4.4-4.71 | 3.9-4.8 |
| Shape | Spherical | Irregular | Irregular |
| Amount of binder | 3%—-4% | 7%—-8% | 7%—8% |
| (Waterglass+CO2hardening) |
| TYPICAL CHEMICAL ANALYSIS | |
| AL2O3 | 70-75% |
| SiO2 | 8-20% |
| Fe2O3 | ≤3% |
| TiO2 | ≤3.5% |
| CaO | ≤0.45% |
| MgO | ≤0.35% |
| K2O | ≤0.33% |
| Na2O | ≤0.08% |
| TYPICAL PHYSICAL PROPERTIES | |
| Refractoriness | ≥1800 ℃ |
| Specific gravity: | 3.4g/cm3 |
| Bulk density(LPD): | 1.95-2.05 g/cm3 |
| Color: | black brown |
| Grit shape: | spherical Ball |
| Thermal expansion coefficient | 6×10-6 /℃(20-1000℃) |
| Thermal conductivity | 0.698W/M.K(1200℃) |
| Thermal expansion ratio | 0.13% |
| Angularity | ≤1.1 |
| Available sizes | |
| AFS15-20,AFS 15-25,AFS25-35,AFS25-30,AFS30-35,AFS35-40,AFS40-45,AFS45-50,AFS40-50,AFS50-55,AFS55-60,AFS60-65 Customized sizes are available upon request | |
Applications:
1. Shell molding
2. Precision Casting
3. Lost foam casting
4. Heavy steel casting
5. Resin coated sand casting
6. Vacuum casting
7. Investment casting
