Refractories 
1.Description：
Sintered Spinel is made of industrial alumina and high purity caustic-calcined magnesite powder by high pressure sintering and fine grinding in UHT converter.
2.Characteristics：
It characterized with high hardness, small coefficient of thermal expansion,thermal shock stability etc.
3.Application：
It’s ideal raw material of ladle castable and magnesium spinel bricks. It’s extensively applied to the lining of converter,glass kiln, open hearth, casting ladle etc.
4.Specification：
Items | Unit | MAS 66 | MAS 78 | |||
Guarantee Value | Typical Value | Guarantee Value | Typical Value | |||
Chemical Composition | Al2O3 | % | 64-67 | 65.7 | 74-79 | 77.2 |
MgO | % | 32-35 | 33.3 | 20-25 | 21.8 | |
CaO | % | 0.60 max | 0.39 | 0.6 max | 0.26 | |
SiO2 | % | 0.40 max | 0.25 | 0.4 max | 0.25 | |
Fe2O3 | % | 0.50 max | 0.31 | 0.5 max | 0.31 | |
Na2O | % | 0.10 max | 0.04 | 0.3 max | 0.18 | |
Magnetic | % | 0.02max | 0.01 | 3.2 min | 3.26 | |
Bulk Density | g/cm3 | 3.2 min | 3.26 | 1850 max | 1800 | |
Refractoriness | ℃ | 1850 max | 1800 | 1 max | 0.5 | |
Absorbing Water Rate | % | 1 max | 0.5 | 5.0 max | 3.2 | |
Porosity Rate | % | 5.0 max | 3.2 | 74-79 | 77.8 | |
Grain Size | mm | 8-5, 5-3, 3-1, 1-0 | ||||
Fine Powder | mesh | -220, 325F | ||||