Brown aluminum oxide F4-F220 mean diameter
Brown Aluminum Oxide is made from Calcined Bauxite. It is a hard and tough material, used in grinding wheels manufacturing and coated products，also used for shot blasting and as polishing media.
About brown aluminum oxide,have standard of particle size distribution and also has its mean diameter of each size as follows:
| Grit designation | Mean diameter（um) | Grit designation | Mean diameter（um) |
| F4 | 4890 | F36 | 525 |
| F5 | 4125 | F40 | 438 |
| F6 | 3460 | F46 | 370 |
| F7 | 2900 | F54 | 310 |
| F8 | 2460 | F60 | 260 |
| F10 | 2085 | F70 | 218 |
| F12 | 1765 | F80 | 185 |
| F14 | 1470 | F90 | 154 |
| F16 | 1230 | F100 | 129 |
| F20 | 1040 | F120 | 109 |
| F22 | 885 | F150 | 82 |
| F24 | 745 | F180 | 69 |
| F30 | 625 | F220 | 58 |