| |
1st
Grade |
2st
Grade |
| Al2O3 |
70-77% |
60-70% |
| SiO2 |
22-29% |
25-35% |
| Fe2O3 |
0.1% max |
1.0% max |
| Refractoriness |
1850℃ |
1800℃ |
| Mullite
phase |
95% min |
90% min |
Brand
Property |
GRIT(>0.1mm)
|
FINE(≤0.1mm) |
| Chemical
Composition |
Al2O3%
|
70-77 |
70-77 |
| SiO2%
|
22-29 |
22-29 |
| Fe2O3%
|
≤0.20 |
≤0.30 |
| TiO2% |
≤0.10 |
≤0.10 |
| CaO%
|
≤0.30 |
≤0.30 |
| Na2O%
|
≤0.30 |
≤0.50 |
| Physical
Porperty |
Apparent
Porosity% ≤ |
5
|
| Bulk
Density% g/cm3≥ |
3.00 |
| Refractoriness℃ |
≥1850 |
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