Abrasive waterjet cutting uses garnet sand as the cutting abrasive. Garnet is a natural, hard, and chemically inert mineral with a Mohs hardness of 7.0 to 7.5, making it ideal for accelerating the water jet and cutting hard materials. It contains no free silica, so it poses no silicosis risk to operators, and it is non-toxic and can be landfilled or recycled in some applications.
Why Garnet?
Garnet is preferred over other abrasives such as silica sand, aluminum oxide, or steel grit for several reasons. It is hard enough to cut virtually any material, it fractures into sharp-edged particles that maintain cutting efficiency, it produces minimal dust, and it is relatively low in cost. Aluminum oxide cuts faster but costs significantly more, while silica sand is cheaper but creates health hazards and cuts poorly.
Common Garnet Mesh Sizes
Garnet is graded by mesh size, which refers to the number of openings per linear inch in the screening sieve. The most common grades in waterjet cutting are:
| Mesh Size | Particle Size | Typical Application |
|---|---|---|
| 50–60 mesh | Coarse | Very thick materials, fast cutting, rough edge |
| 80 mesh | Medium-coarse | General thick plate cutting, most common grade |
| 120 mesh | Medium | Standard cutting, balanced speed and edge quality |
| 150 mesh | Medium-fine | Thinner materials, smoother edge finish |
| 220 mesh | Fine | Precision cutting, best surface finish, slower speed |
| 320 mesh | Very fine | Ultra-fine finishing, specialty applications |
How to Choose the Right Mesh Size
The choice depends on three factors: material thickness, required edge quality, and cutting speed priority.
For thick materials above 25mm, use 50–80 mesh. The coarser particles carry more energy and cut faster, though the edge may be rougher.
For general plate cutting between 5mm and 25mm, 80–120 mesh is the most widely used range, offering a good balance of speed and edge quality.
For thin materials and precision parts, use 150–220 mesh. The finer abrasive produces smoother edges with surface roughness as low as Ra 1.6 to 3.2 microns, but cutting speed drops by 20% to 40% compared to 80 mesh.
For specialty applications requiring the finest finish, 220–320 mesh is used, though speed is significantly reduced.
Other Selection Factors
Garnet quality also matters. High-purity garnet with consistent particle size distribution cuts more efficiently and causes less wear on the mixing tube and orifice. Recycled garnet is available at lower cost but may contain impurities that accelerate wear. Winwin recommends using virgin garnet for critical applications and can advise on the optimal grade based on your specific materials and quality requirements.
Winwin offers a complete range of waterjet cutting equipment, high-pressure pumps, and genuine waterjet accessories including garnet abrasive and all related consumables. We support full customization to match your materials, thicknesses, and production requirements. Winwin provides comprehensive after-sales service for products shipped worldwide, including professional installation, calibration, operator training, spare parts supply, remote technical support, and full lifecycle service, ensuring your equipment performs reliably wherever you are.
Post time：2026-09-10
