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Item/Grade | Fire Clay Brick | High Alumina Brick | High alumina brick | |||||||||||
SK-30 | SK-32 | SK-34 | SK-35 | SK-36 | SK-37 | SK-38 | SK-40 | |||||||
AL2O3% (≥) | 30 | 35 | 38 | 45 | 55 | 65 | 70 | 82 | ||||||
Fe2O3% (≤) | 2.5 | 2.5 | 2 | 2 | 2 | 2 | 2 | 2 | ||||||
Refractoriness(SK) | 30 | 32 | 34 | 35 | 36 | 37 | 38 | 40 | ||||||
Refractoriness Under Load, 0.2MPa, °C (≥) | 1250 | 1300 | 1360 | 1420 | 1450 | 1480 | 1530 | 1600 | ||||||
Apparent Porosity (%) | 22-26 | 20-24 | 20-22 | 18-20 | 20-23 | 20-23 | 20-22 | 18-20 | ||||||
Bulk Density (g/cm³) | 1.9-2.0 | 1.95-2.1 | 2.1-2.2 | 2.15-2.22 | 2.25-2.4 | 2.3-2.5 | 2.4-2.6 | 2.5-2.7 | ||||||
Cold Crushing Strength ,MPa (≥) | 20 | 25 | 30 | 40 | 45 | 50 | 60 | 70 | ||||||







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