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