The chart shows the symbolic code in a grit size range after chemical analyses.
| Grit Size Range | Code |
| 12～80# | 46# |
| P12～P80 | P40 |
| 90#～150# | 120# |
| P100～P150 | P120 |
| 180#～220# | 180# |
| P180～P220 | P180 |
| W63～W5 | W14 |
| P240～P1200 | P600 |
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