High Alumina Fire Brick — 70%
70% alumina, 2.63 g/cc, 20.1% apparent porosity, 520 kg/cm² cold crushing strength. A high-duty brick — but note that the strength gain over the 60% grade is small while the alumina content jumps, so the case for it is chemistry and refractoriness, not mechanical strength.
| Al₂O₃ content, % | 70.32 |
|---|---|
| Fe₂O₃ content, % | 3.11 |
| Bulk density, g/cc | 2.63 |
| Apparent porosity, % | 20.11 |
| Cold crushing strength, kg/cm² | 520 |
| Refractoriness, Orton/°C | — |
| RUL (Ta), °C | — |
Values as published by the manufacturer. Manufacturer TDS governs.
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