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Product description of high alumina refractory bricks
High aluminum bricks refer to aluminum silicate firebricks with an Al₂O₃ content over 65%, which are molded and calcined according to different grades of bauxite clinker, quality requirements, and bonding agents used. The refractoriness of high alumina brick is higher than that of clay brick and semi-silicon brick, up to 1750~1790℃, belonging to the advanced refractory material.
Features of high alumina refractory bricks
High alumina refractory brick has the characteristics of high refractoriness, good acid resistance, alkali slag resistance, metal liquid erosion resistance, high load softening temperature, strong thermal shock resistance and redox reactivity.
Parameters of high alumina refractory bricks
| Item/Grade | SK-36 | SK-37 | SK-38 | SK-40 |
| AL2O3% (≥) | 55 | 65 | 70 | 82 |
| Fe2O3% (≤) | 2 | 2 | 2 | 2 |
| Refractoriness(SK) | 36 | 37 | 38 | 40 |
| Refractoriness underload, 0.2MPa, °C (≥) | 1450 | 1480 | 1530 | 1600 |
| Apparent porosity (%) | 20-23 | 20-23 | 20-22 | 18-20 |
| Bulk density (g/cm³) | 2.25-2.4 | 2.3-2.5 | 2.4-2.6 | 2.5-2.7 |
| Cold crushing strength ,MPa (≥) | 45 | 50 | 60 | 70 |