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High Aluminum 7 holes checkersinclude high refractoriness, large volume density, high intensity and high refractoriness under load. They also have good creeping in high-temperature, excellent regenerative capability.
Physical and chemical indexes
Brand
7 holes checker
Al2O3 (%) ≥
45
Bulk density (g/cm3) ≥
2.15
Apparent porosity (%) ≤
23
Cold crushing strength(MPa) ≥
35
Creep rate1200°C×20-50h,0.2MPa) ≤
0.2
Refractoriness under load(0.2Mpa) (°C) ≥
1520
Permanent linear change 1400°C×4h
0-0.3
Refractoriness(°C) ≥
1750
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