Chrome oxide green for the boundary between grinding and polishing — where surface finish is measured in nanometres. Micronized, narrowly classified, zero rogue particles.
The polishing behaviour of chrome oxide green comes from an unusual combination: extreme hardness with a rounded, friable grain.
Between fused alumina and diamond — hard enough to cut steel, glass and ceramics, soft enough to never gouge the substrate the way diamond and SiC do.
Each particle micro-fractures during use, continuously exposing fresh cutting edges. The result is uniform material removal — no ploughing, no deep scratches, no comet tails.
GREEN 1025 is classified to a tight D50 window with coarse oversize removed. No rogue large particles means one-pass finishes that used to take three passes with conventional powders.
The oxide abrasives all polish — but they cut differently. Chrome oxide green sits in the golden band: harder than every finishing oxide, softer and kinder than alumina and diamond.
| Oxide abrasive | Mohs | Cutting mode | Where it wins | Where it loses |
|---|---|---|---|---|
| Cr₂O₃ — chrome green | 8.5 – 9 | Micro-fracturing · polishing-cut | Stainless, chrome alloys, optics — self-sharpening, scratch-free | Lower stock removal than alumina |
| Fe₂O₃ — iron rouge | 5.5 – 6.5 | Soft smear · brightening | Cheapest mirror brightener, jewellery | Slow cutting; rust contamination risk on steel |
| Al₂O₃ — alumina | 9 | Blocky fracture · grinding | Fast bulk stock removal | Deep scratches, embedded grit, no fine finish |
| CeO₂ — ceria | 6 | Chemical-mechanical · optics | Unbeatable on glass lenses | Expensive; near-useless on metals |
| ZrO₂ — zirconia | 8 | Tough ductile · lapping | High-toughness workpiece materials | High cost, limited colour workability |
Below Mohs 7 the oxide only polishes (rouge); at Mohs 9 and above it grinds (alumina, diamond) and gouges when over-pressured. Chrome oxide green lives in the band between: hard enough to cut stainless and hardened steel, friable enough to fracture instead of gouge — which is exactly why chromium compounds have dominated precision finishing since the chromium-oxide polishing compounds of the 19th century.
| Chrome oxide green | White fused alumina | Diamond micron powder | |
|---|---|---|---|
| Mohs hardness | 8.5 – 9 | 9 | 10 |
| Cutting mode | Micro-fracturing · polishing | Blocky cutting · grinding | Hard cutting · lapping |
| Scratch risk | Low — self-sharpening round grains | Medium — sharp blocky edges | High if misapplied |
| Stock removal | Moderate, very uniform | Fast | Fast on hard materials |
| Relative cost | Medium | Low | High |
| Best role | Final finish · honing · optics | Bulk stock removal | Hard metals, ceramics, composites |
Rough map from surface state to recommended route — exact windows are matched to your workpiece and machine.
The ladder mirrors the surface itself: coarse ridges at the top, mirror at the bottom — one powder family, three finish levels.
Pair a coarse-window grade with your existing stone or belt step. Chrome oxide finishes what alumina started — removing the final ridges without opening new ones.
The standard GREEN 1025 window. Ideal for honing bores and superfinishing races — consistent cross-hatch, round geometry, no chatter.
The fine-fraction variant in slurry or buffing compound. Slower stock removal, nanometre-level finish — the last pass before inspection.
| Application | What it delivers |
|---|---|
| Hydraulic bores — honing | Consistent cross-hatch, round bores, faster cycle times |
| Bearing races — superfinishing | Ra down to the nanometre range, zero chatter marks |
| Cutting tools — edge polishing | Mirror edges without rounding, longer tool life |
| Optics — lens and prism finishing | Scratch-free surfaces, stable stock removal rate |
| Stainless steel — mirror finishing | High gloss with measurable Ra, fewer rework passes |
| Parameter | Typical value | Parameter | Typical value |
|---|---|---|---|
| Grade | GREEN 1025 micronized | Mohs hardness | 8.5 – 9 |
| Particle form | Sub-micron, rounded-friable | Oversize control | Coarse cut removed |
| D50 window | Tight (per lot) | Cr(VI) | On request |
| Packaging | 25 kg bags · 1 t big bags | Traceability | Blockchain QR per lot |
Polishing and grinding articles written around GREEN 1025 — distribution, slurry engineering and finish control.
Tell us your workpiece, current Ra and cycle time — we propose a grade and window within one business day.
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