Industrial Overview
Selecting the correct abrasive media is the most critical decision in determining the "Cost per Square Meter" of an industrial blasting project. While **Garnet** is the world standard for expendable, high-performance blasting, **Steel Grit** dominates the high-recyclability sector in enclosed facilities.
What is Garnet?
Garnet is a natural gemstone abrasive. It is chemically inert, low-dusting, and provides a sharp angular profile. Ideal for "once-through" open blasting in shipyards and refineries.
What is Steel Grit?
Steel Grit is a manufactured metallic abrasive. It is extremely hard and engineered for high recyclability (up to 200+ times). Mandatory for automatic blast rooms and heavy steel fabrication.
Technical Comparison Table
| Feature | Almandine Garnet | Angular Steel Grit |
|---|---|---|
| Hardness (Mohs) | 7.5 - 8.0 | 8.0 - 9.0 |
| Recyclability | 3-5 Times | 200+ Times |
| Dust Generation | Very Low | Zero (Metallic) |
| Surface Finish | Sharp, Uniform Sa 3.0 | Deep, Aggressive Anchor |
| Nozzle Wear | Moderate | High (Requires B4C) |
| Disposal Cost | Low (Inert) | N/A (Recycled) |
Garnet Logic
- Best for ship hull open blasting.
- Lower setup cost (no recovery floor).
- Superior for stainless steel (no carbon contamination).
Steel Grit Logic
- Mandatory for Automatic Blast Rooms.
- Lowest long-term cost due to recycling.
- Fastest cleaning rate on heavy scale.
Frequently Asked Questions
Is garnet better than steel grit for industrial blasting?
Depends on the application. Garnet: best for expendable field work where recovery is impractical, for coating prep requiring sharp angular profile, and where steel contamination must be avoided. Steel grit: best for blast room recovery systems where media is reused 100+ times, for aggressive profile on heavy mill scale, and where cost-per-m² is the primary constraint.
What is the shelf life of garnet abrasive?
Garnet has no practical shelf life when stored correctly: keep in sealed bags, off the ground on pallets, away from moisture. Copper slag has a 6-12 month shelf life before moisture causes caking. Steel grit has unlimited shelf life when kept dry. Rotate stock FIFO (first in, first out) to maintain quality consistency.
What is the reusable cycle count for different abrasives?
Garnet: 5-8 reuse cycles in blast room with classifier recovery. Steel grit: 100-300 reuse cycles — angular grit fractures and work-hardens, extending life. Steel shot: 500+ reuse cycles. Glass beads: 20-40 reuse cycles. Copper slag: 0-2 reuse cycles. Factor reuse into your abrasive cost model.