Process principle: Graded sequential grinding, skip grits not allowed; wet grinding throughout; high-purity GC for light-colored marble to avoid yellowing caused by iron impurities
| Process | Green SiC Grit | Description |
|---|---|---|
| Rough Grinding (Leveling, removing deep scratches & pits) | 60#, 80#, 120# | Fast leveling to eliminate height differences and old deep scratches. Use 60# for heavily damaged stone; start with 80# for regular renovation; 120# serves as the final rough grinding step before moving to medium grinding. |
| Medium Grinding (Transition) | 180#, 240#, 400# | Remove scratches from rough grinding, gradually reduce surface roughness and prepare base for fine grinding. |
| Fine Grinding | 800#～1500# | Eliminate fine scratches from medium grinding to form uniform matte surface and boost base gloss. Critical pre-step for mirror polishing; common grades: 800# /1000# /1500# in sequence. |
| Mirror Polishing (High Gloss) | 2000#～3000#; micropowder for ultra-mirror finish (≈3000#/5000#) | 2000#–3000# green SiC grinding blocks/water grinding discs for pre-high-gloss treatment. For premium mirror effect, use ultra-fine green SiC micropowder, can be combined with tin oxide polishing powder for final brightening. |
Full Standard Step Sequence (For marble slabs & floor renovation)
80# →120# →180# →240# →400# →800# →1000# →1500# →2000# →3000# (optional ultra-mirror)
Additional Selection Notes
- Soft marble (White Marble, Carrara marble): Lower grinding pressure. Avoid coarse 60#. Start with 80# to prevent stone chipping and deeper scratches.
- Green silicon carbide is suitable as raw material for resin water grinding pads / grinding bricks. Diamond pads may be used first for rough leveling, then switch to full GC grinding sequence.
- All scratches from the previous grit must be completely removed before advancing to the next grit, otherwise scratches will remain on mirror surface.
- Micropowder W designation: W28, W20 for pre-fine grinding; W10, W7, W5 for final mirror polishing (Smaller W number = finer particles)
