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Item | Standard | H Pure | H Alumina | Zirconium |
AL2O3(%) | ≥44 | ≥45 | ≥53 | ≥34 |
Sio2(%) | ≥52 | ≥54 | ≥46 | ≥50 |
Fe2O3+Tio2(%) | ≤1.0 | ≤0.5 | ≤0.5 | ≤0.5 |
ZrO2(%) | - | - | - | ≥15 |
Classification Temperature (℃) | 1260 | 1260 | 1350 | 1430 |
Working Temperature (℃) | 1050 | 1100 | 1200 | 1350 |
Density (kg/m3) | 160-220 | 160-220 | 160-220 | 160-220 |
linear shrinkage after heating(%) @24 hours | ≤2.5 (1000°C) | ≤2.5 (1100°C) | ≤2.5 (1100°C) | ≤3.5 (1350°C) |
Thermal Conductivity(w/m.k) @400°C | 0.090 | 0.101 | 0.102 | 0.118 |










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