High-alumina castable
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Castable
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Details Introduction
High-alumina castable is an unshaped refractory castable with a high alumina aggregate containing more than 75% Al₂O₃, combined with high-alumina powder and additives, resulting in a total aluminum content of >55%. After initial setting, high-alumina castable is standard cured for 28 days, achieving a compressive strength of 40~60 MPa. Its characteristics include a slow hydration rate, high strength in the later stage, and high refractoriness.
| Grade |
GL-85 |
GL-70 |
GL-60 |
GN-50 |
GN-42 |
| Al₂O₃, % ≥ |
85 |
70 |
60 |
50 |
42 |
| Refractoriness, ℃ ≥ |
1780 |
1720 |
1700 |
1660 |
1640 |
| Rate of linear change after firing ≤ ±1% at test temperature (insulation for 3h), ℃ |
1500 |
1450 |
1400 |
1400 |
1350 |
| Compressive strength MPa ≥ after drying at 110±5℃ |
35 |
35 |
30 |
30 |
25 |
| Flexural strength MPa ≥ after drying at 110±5℃ |
5 |
5 |
4 |
4 |
3.5 |
Key words:
High-alumina castable
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