High Alumina Fire Brick — 30%
The entry grade of the fireclay series — 30% alumina, 25% apparent porosity, 300 kg/cm² cold crushing strength, with refractoriness under load to 1340 °C. It is the most open brick in the range, and that porosity is both why it is the cheapest and why slag and alkali vapour find their way into it first.
| Al₂O₃ content, % | 30 |
|---|---|
| Fe₂O₃ content, % | 2.65 |
| Bulk density, g/cc | 1.90-1.95 |
| Apparent porosity, % | 25 |
| Cold crushing strength, kg/cm² | 300 |
| Refractoriness, Orton/°C | — |
| RUL (Ta), °C | 1340 |
Values as published by the manufacturer. Manufacturer TDS governs.
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