High Alumina Fire Brick — 40%
40% alumina at 2.10–2.15 g/cc, with porosity down to 22–23% and cold crushing strength of 350–400 kg/cm². Refractoriness under load reaches 1400 °C. The step up from 30% buys density and a tighter pore structure rather than a large jump in temperature rating.
| Al₂O₃ content, % | 40 |
|---|---|
| Fe₂O₃ content, % | 2.8 |
| Bulk density, g/cc | 2.10-2.15 |
| Apparent porosity, % | 22-23 |
| Cold crushing strength, kg/cm² | 350-400 |
| Refractoriness, Orton/°C | — |
| RUL (Ta), °C | 1400 |
Values as published by the manufacturer. Manufacturer TDS governs.
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