garnet sand for sand blasting

Garnet sand is a highly effective abrasive material widely used in sandblasting (abrasive blasting) due to its hardness, durability, and low dust production. Here’s a detailed overview:

Key Properties of Garnet Sand for Sandblasting

1. Hardness (7.5-8.5 on Mohs scale) – Harder than silica sand but less aggressive than aluminum oxide, making it ideal for removing coatings without damaging substrates.
2. Sharp Angular Grains – Provides efficient cutting action for fast cleaning and surface profiling.
3. Low Dust & Reusable – Generates minimal airborne dust compared to silica sand and can be recycled multiple times.
4. Chemically Inert – Non-toxic, environmentally friendly, and safe for use on stainless steel, aluminum, and other sensitive metals.
5. No Free Silica – Unlike silica sand, garnet does not pose silicosis risks (a major health hazard).

Common Applications

• Removing rust, paint, mill scale, and old coatings.
• Surface preparation before welding or coating (e.g., SA 2.5 or SA 3 cleanliness standards).
• Etching glass or stone surfaces.
• Shipbuilding, oil & gas pipelines, aerospace components.

Garnet Mesh Sizes for Blasting

| Mesh Size | Grit Size (Microns) | Typical Use |
|———–|———————|————-|
| 30/60 | 250-600 | Heavy-duty rust/coating removal |
| 60/80 | 180-250 | General-purpose blasting |
| 80/120 | 125-180 | Fine finishing & delicate surfaces |

Advantages Over Other Abrasives

✔ Safer than silica sand (OSHA/NIOSH compliant).
✔ Faster cutting than walnut shells or plastic media.
✔ Less embedment compared to steel grit/shot.

Disadvantages

❌ Higher cost than silica sand but more economical long-term due to reusability.
❌ Requires proper containment/recovery systems for recycling.

Safety Considerations

• Always use PPE (respirators, gloves, blast suits).
• Ensure proper ventilation/dust extraction systems.

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