Sands & Clays
Chamotte (Calcined Fireclay)
Chamotte, or calcined fireclay, is produced by calcining refractory clay and serves as the structural aggregate of fireclay bricks and castables. It is supplied in a range of alumina grades (CS and CT series).
Typical Analysis
| Composition (%) | CS-10 | CS-20 | CT-44 | CT-50 | CT-55 | CT-60 | CT-65 |
|---|---|---|---|---|---|---|---|
| Al₂O₃ | 41-42 | 42-43 | 44±1.5 | 50±1.5 | 55±1.5 | 60±2 | 65±2 |
| SiO₂ | 51-52 | 50-51 | 43±1 | 37±1.5 | 33.5±1 | 26±2 | 20±2 |
| Fe₂O₃ | <2.2 | ≤1 | <2.8 | 2.5±0.2 | 2.6±0.2 | 2.5±0.2 | 2.5±0.2 |
| TiO₂ | <2 | <2 | 5.5-6 | 6.2-6.7 | 5.5-6.5 | 6.2-6.7 | 5.5-6.5 |
| CaO | <0.3 | <0.3 | <0.6 | <0.6 | <0.6 | <0.6 | <0.6 |
| MgO | 0.6 | 0.6 | <0.6 | <0.6 | <0.6 | <0.6 | <0.6 |
| K₂O+Na₂O | <0.8 | <0.8 | <1.2 | <1.2 | <1.2 | <1.2 | <1.2 |
| L.O.I | <0.15 | <0.15 | <0.15 | <0.15 | <0.15 | <0.15 | <0.15 |
| Bulk density (g/cm³) | 2.6-2.7 | 2.65-2.75 | 2.5-2.6 | 2.5-2.6 | 2.6-2.7 | 2.65-2.75 | 2.7-2.8 |
| Water absorption (%) | 1.5-2 | 1 | 1-2.5 | 1-2.5 | 2.5-3 | 2.5-3 | 2.5 |
Key Properties
| CS series | Calcined fireclay — TiO₂ below 2% |
|---|---|
| CT series | Bauxitic origin — TiO₂ 5.5–6.7% |
| Alumina range | 41 to 65% |
| Lowest water absorption | CS-20 at 1% |
| Available fractions | 0-30 / 4.8-2.4 / 2.4-1.2 / 1.2-0.6 / ≤0.6 / ≤0.1 mm |
| Delivery point | Tehran |
