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ultra low cement castable
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Ultra-low cement refractory castable is developed on the basis of low-cement refractory castables. The amount of aluminate cement is generally 2.5% ~ 5%, the performance is better than low cement refractory castable. Ultra-low cement refractory castable varieties are more widely used.
Ultra-low cement refractory castable preparation principles and strength characteristics, and low cement refractory castable is basically the same, its strength slightly higher.
Ultra-low cement refractory castable composition: refractory aggregate, refractory powder, the amount of ultra-fine powder, amount or a small amount of calcium aluminate cement and trace dispersant.
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Products |
Ultra low cement castable |
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Material |
Clay |
High alumina |
Corundum |
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Bulk density（g/cm3） |
110℃×16h≥ |
2.35 |
2.70 |
3.20 |
|
|
1500℃(1350℃)×3h≥ |
2.30 |
2.65 |
3.15 |
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Chemical composition（%） |
AL2O3 ≥ |
45 |
75 |
95 |
|
|
CaO ≤ |
1.15 |
1.15 |
1.15 |
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Flexible strength（MPa） |
110℃×16h≥ |
6 |
6 |
8 |
|
|
1500℃(1350℃)×3h≥ |
8 |
8 |
10 |
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C.C.S（MPa） |
110℃×16h≥ |
40 |
40 |
60 |
|
|
1500℃(1350℃)×3h≥ |
70 |
800 |
90 |
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L.C.（%） |
110℃×16h≤ |
-0.1 |
0 |
0 |
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|
1500℃(1350℃)×3h≤ |
±0.5 |
±0.5 |
±0.5 |
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Refractoriness（℃）≥ |
1710 |
1790 |
1790 |
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|
Service temperature（℃） |
1400 |
1450 |
1650 |
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