The crystal of white corundum is white, with high-quality alumina as raw materials, the content of AI2O3 is greater than 99%, and the hardness is higher than that of brown corundum, The Fe2O3 content of white corundum is very low, which is suitable for sandblasting operations where iron residue is strictly prohibited. At the same time, white corundum is relatively hard, suitable for most sandblasting machine, but also used as grinding and polishing materials, precision casting sand, spraying materials, chemical catalyst carriers, functional ceramics, refractory materials, etc.
| Typical Chemical composition | |
| AL2O3 | 99.3%min |
| SiO2 | 0.06% |
| Na2O | 0.3%max |
| Fe2O3 | 0.05%max |
| CaO | 0.04%max |
| MgO | 0.01%max |
| K2O | 0.02#max |
| Typical physical properties | |
| Hardness: | Mohs:9.0 |
| Maximum service temperature: | 1900 ℃ |
| Melting Point: | 2250 ℃ |
| Specific Gravity: | 3.95g/cm3 |
| Volume density | 3.6g/cm3 |
| Bulk density(LPD): | 1.75-1.95 g/cm3 |
| Color: | White |
| Particle shape: | Angular |
| Available size: | |
| F8# F10# F12# F14# F16# F20# F22# F24# F30# F36# F46# F54# F60# F70# F80# F90# F100# F120# F150# F180# F220# | |
1, pure white, high hardness;
2, slightly lower toughness, high purity;
3, excellent self-sharpening, strong grinding force, small heat;
4, high efficiency, acid and alkali corrosion resistance, high temperature, good thermal stability;
5, white corundum is not only a material but also abrasive and grinding materials, to grind for high carbon steel, various high-speed steel and stainless steel.
6, white corundum is also widely used in casting, steel refractory material, 95 electric porcelain, decorative porcelain and special ceramics, as well as military, electronic products and other high-tech industries.