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Special shape high-alumina brick size: 230 * 115 * 20mm
The content of Al2O3 in the two-piece high-alumina brick is usually divided into three classes: first-class Al2O3 content> 75%, second-class Al2O3 content 60-75%, third-class is 48~60%
Special shape high-alumina brick is belong to senior refractory bricks, refractoryness can reach 1750 ~ 1790 ℃
Mainly applied for masonry blast furnace, hot stove, electric furnace top, blast furnace, reverberatory furnace, rotary kiln lining,and it is also widely used as flat heat lattice brick, pouring chock plug brick, nozzle brick and so on.
| Name
Item
Grade |
First class high-alumina brick | Second class high-alumina brick | Third class high-alumina brick | Special high-alumina brick |
| GL-75 | GL-65 | GL-55 | GL-80 | |
| Al2O3%＞ | 75 | 65 | 55 | 82 |
| Fe2O3 %＜ | 2.5 | 2.5 | 2.6 | 2.0 |
| Density g/cm2 | 2.5 | 2.4 | 2.3 | 2.6 |
| Cold compressive strength Mpa ＞ | 70 | 60 | 50 | 80 |
| Refractoriness under load ℃ | 1510 | 1460 | 1420 | 1550 |
| Degree of fire resistance ℃ ＞ | 1790 | 1770 | 1770 | 1790 |
| Apparent porosity %＜ | 22 | 23 | 24 | 21 |
| Linear change rate % | -0.3 | -0.4 | -0.4 | -0.2 |