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Grade | common | standard | high pure | high alumina | zirconium |
max.temperature( °C) | 1100 | 1260 | 1260 | 1360 | 1450 |
Bulk Density (kg/m3) | 96/128/160 | 96/128/160 | 96/128/160 | /128/160 | /128/160 |
shrinkage on heating(%) 24 hours,density as 128/m3 | -4 (1000°C) | -3 (1000°C) | -3 (1000°C) | -3 (1250°C) | -3 (1250°C) |
thermal conductivity by mean temp.(w/m.k)(density as 128kg/m3) | 0.09(400°C) 0.16(800°C) | 0.09(400°C) 0.16(800°C) | 0.09(400°C) 0.16(800°C) 0.20(1000°C) | 0.12(600°C) 0.20(1000°C) | 0.16(800°C) 0.20(1000°C) |
tensile strength(mpa)(density as 128kg/m3) | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 |
AL2O3 | 44 | 46 | 47-49 | 52-55 | 39-40 |
AL2O3+SiO2 | 96 | 97 | 99 | 99 | - |
AL2O3+SiO2+ZrO2 | - | - | - | - | 99 |
ZrO2 | - | - | - | - | 15-17 |
Fe2O3 | <1.2 | <1.0 | 0.2 | 0.2 | 0.2 |
Na2O+k2O | <0.5 | <0.5 | 0.2 | 0.2 | 0.2 |












