Media choice
| Feature | Garnet | Angular steel grit |
|---|---|---|
| Mohs (guide) | 7.5-8 | 8-9 |
| Recycles | A few cycles | Hundreds in a room |
| Dust | Low | Low if metallic and recovered |
| Finish | Sharp, even | Aggressive anchor |
| Nozzle wear | Moderate | High (B4C helps) |
Most BLAST APEX site jobs around Mumbai still run graded copper slag. Use garnet when the coating spec names it. Use steel grit in a cabinet or blast room, not as loose bags on a jetty.
Garnet (Mohs about 7.5-8) gives a sharp, even profile and low dust. You may get a few recycles if you recover it clean. Angular steel grit is harder, cuts an aggressive anchor, and will run hundreds of cycles on a recovery floor, at the cost of nozzle wear. Copper slag is the cheap once-through bag for structural work. Do not mix the three in one pot: metering and dust change, and the profile becomes a guess.