Calcined Alumina At High Temperature has a small particle size of about 1μm. It has good grindability and high sintering activity. It is easy to be crushed into fine powder with an average particle size of about 1μm. This high temperature for precision alumina ceramics, rolls. It can also be used as filler and insulation material for electrical components. So high temperature alumina than ordinary alumina on the requirements of the data are relatively high. It has the characteristics of high density, low porosity, low permeability and strong fire resistance. It is generally used in refractory materials or abrasives. Plate corundum is made by pelleting calcined aluminum oxide and heating it in vertical kiln to below its melting point, so it has the characteristics of low porosity, high density, low permeability and high fire resistance, which is especially suitable for material resistant applications.
| Brand Name | Al2O3 | SiO2 | Fe2O3 | Na2O | L.O.I | Effective density | α-Al2O3% | Grind size of 24 minutes |
| ≥ | ≤ | ≤ | ≤ | ≤ | g/cm3≥ | ≥ | D50，μ m | |
| A-C-30 | 99.3 | 0.1 | 0.04 | 0.3 | 0.2 | 3.93 | 94 | 3±1 |
| A-C-30A | 99.3 | 0.1 | 0.04 | 0.3 | 0.2 | 3.93 | 93 | 2.5±1 |
