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磨料粒度对照表
输入目数，立即换算微米。
Grit → Micron Reference
| Grit (FEPA P) | Avg particle (µm) | Surface feel |
|---|---|---|
| P60 | 269 | Heavy stock removal |
| P120 | 125 | Shaping |
| P180 | 82 | Blending |
| P240 | 58.5 | Fine sanding |
| P400 | 35 | Pre-polish |
| P800 | 21.8 | Wet sanding |
| P1500 | 12.6 | Fine finish |
| P2500 | 8.4 | Polishing prep |
| 1 µm paste | 1 | Mirror polish |
Rule of Thumb
Each full grit step removes roughly half the scratch depth. Jump no more than one grit class per pass or you leave deep scratches that the next grit cannot erase.
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