- High Purity: Rich in Cr₂O₃ (44%-48%) with minimal impurities, sourced from South Africa’s abundant chromite reserves.
- Uniform Grading: Controlled particle size (typically AFS 45-70) ensures excellent flowability and compaction.
- pH Neutrality: Compatible with both acidic and alkaline binders.
Typical Applications
- Automotive: Engine blocks, turbocharger housings.
- Energy: Wind turbine gearboxes, nuclear valve castings.
- Heavy Machinery: Wear-resistant mining components, hydraulic parts.
Comparison with Other Foundry Sands
| Property | Chromite Sand | Silica Sand | Zircon Sand |
|---|---|---|---|
| Refractoriness (°C) | 1800-1900 | ~1710 | 2200-2400 |
| Thermal Expansion | Low | High | Very Low |
| Cost | Moderate | Low | High |
| Health Risks | Low (low silica) | High (silicosis) | Low |
Selection Guidance
South African chromite sand is ideal for:
- High-temperature, high-precision castings (e.g., stainless steel, alloy steel).
- Reducing metal penetration and improving surface quality.
- Balancing cost, performance, and workplace safety.
For extreme temperatures (e.g., superalloys), blend with zircon sand; for cost-sensitive projects, use it as a facing sand layer only.
