High alumina refractory castable is one of the unshaped refractories. It’s made of refractory aggregate, refractory powder, binders and other additives, without fixed shape, high liquidity, casting and vibration molding. It can be used directly or used after adding appropriate water or other liquid. It’s one of the new type refractory and doesn’t need calcination.
Features:
1. High refractoriness, High refractoriness under load.
2. High density, low porosity.
3. Good slag resistance and corrosion resistance.
4. High strength and wear resistance.
5. Good resistance to flake performance.
6. Good thermal shock stability.
7. Scouring resistance.
8. Good hot strength.
| Item | A-45 | A-60 | A-70 | A-75 | A-80 | A-90 | |
| Dry Density, g/cm3 | ≥ | 2.3 | 2.5 | 2.6 | 2.65 | 2.7 | 3 |
| Chemical, % | Al2O3 ≥ | 45 | 60 | 70 | 75 | 80 | 90 |
| Modulus of Rupture Mpa | 110℃×24h ≥ | 5 | 8 | 9 | 9 | 10 | 12 |
| 1500℃×3h≥ | 8(1350℃) | 10 (1450℃×3h) | – | – | 12 | 15 | |
| Compressive Strength Mpa | 110℃×24h ≥ | 30 | 40 | 40 | 45 | 45 | 60 |
| 1450℃×3h ≥ | 60 | 80 | 80 | 85 | 90 | 85 | |
| Linear Dimensional Change After Fired | (1500℃×3h)% ≤ | ±0.5 1350℃×3h | ±0.5 1450℃×3h | ±0.5 1450℃×3h | ±0.5 1450℃×3h | ±0.5 | ±0.5 |
| Refractoriness, ℃ | ≥ | 1710 | 1740 | 1790 | 1790 | 1790 | 1790 |
| Working Temp, ℃ | 1450 | 1450 | 1500 | 1550 | 1600 | 1650 |
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