The chart gives a brief introduction to the symbols for brown fused alumina chemical examination.
| Grit Size Range | Symbolic Chemical Analysis Code |
| 4#~80# | 46# |
| P8~P80 | P40 |
| 90#~150# | 120# |
| P100~P150 | P120 |
| 180#~220# | 180# |
| P180~P220 | P180 |
| Up 220# | W14 |
| Up P220 | P600 |
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