Designation of grinding wheel quality
The specification or designation of a grinding wheel quality is determined by five components:
- grain quality
- grain size
- hardness / grade
- structure / density
- type of bond
We describe our quality designation or specification as follows, for example:
| EW | 80 | H | 8 | V 5 |
| grain quality | grain size | hardness / grade | structure / density | type of bond |
|---|---|---|---|---|
| NK Regular aluminium oxide | 14 very coarse | E extra soft | 1 especially dense | V vitrified |
| HK mixed fused alumina | 16 | F | 2 | S silicate |
| EW white fused alumina | 24 | G | 3 dense | R rubber |
| ER pink fused alumina | 30 coarse | H | 4 | RF rubber fibre reinforced |
| EU dark red fused alumina | 36 | I | 5 medium | B resin |
| EK monocrystalline alumina | 40 | J soft | 6 | BF resin fibre reinforced |
| ZR zirconia alumina | 46 | K | 7 open | E shellac |
| CG silicon carbide green | 54 medium | L medium | 8 | MG magnesia (oxychloride) |
| CD silicon carbide black | 60 | M | 9 very open | |
| MK mixed grain | 70 | N hard | ||
| SG sintered aluminium oxide / microcrystalline corundum or sol gel / 3M Cubitron™ | 80 fine | O | P extra porous | |
| 90 | P very hard | |||
| 100 | Q | |||
| 120 | R especially hard | |||
| 150 | S | |||
| 180 | T | |||
| 220 very fine | ||||
| 230 | ||||
| 240 | ||||
| 280 | ||||
| 320 finest | ||||
| 400 | ||||
| 500 | ||||
| 600 |