Nile For Refractories increases its Investments and its Mineral Resources
Cast 95% Al₂O₃
Refractory Castables are produced by blending well distributed calcined kaolin, bauxite or alumina mixture with calcium aluminate cement as a hydraulic bond. These castables are adequate for cold repairing of face linings of industrial furnaces with working rempratures ranging between 1400 and up to 1750 °C according to their Al₂O₃ content.
| Chemical Composition (wt) | Cast 95% Al₂O₃ | |
| SiO₂ | 0.1 – 0.4 | % |
| Al₂O₃ | 93.0 – 95.0 | % |
| Fe₂O₃ | < 0.2 | % |
| CaO | < 5.0 | % |
| Physical and Thermo-Mechanical Proporities | Cast 95% Al₂O₃ | |
| Max. Service temp, °C | 1750 | |
| Grain size, (mm) | 0 – 6 | |
| Water required, (%) | 8 – 11 | |
| Bulk Density after drying at 110 °C, | ≥ 2.75 | g/cm³ |
| Modulus of Rupture, after drying at 110 °C after drying at 800 °C after drying at 1400 °C |
≥ 90 ≥ 87 ≥ 120 |
kg/cm² |
| Cold Crushing Strenght, after drying at 110 °C after drying at 800 °C after drying at 1400 °C |
≥ 600 ≥ 380 ≥ 600 |
kg/cm² |
| Permanent Linear Change, after drying at 800 °C after drying at 1400 °C |
-0.2 -1.3 |
% |
| Linear Thermal Expansion at 1000 °C | 0.3 | % |
| Thermal Conducity Coef-, – at 400 °C – at 700 °C – at 1000 °C |
1.87 |
W/m.K |
