How to Choose Garnet for Sandblasting on Different Materials？

Working with multiple materials—stainless steel, aluminum, carbon steel, or ship hulls—requires more than a one‑size‑fits‑all abrasive. Using the wrong mesh can ruin your surface, reduce coating adhesion, or waste time and money. This guide helps you match the right garnet mesh to your material.

1. Stainless Steel – Low Chloride is Key

Use 80 mesh or finer. Requires chloride <25ppm, ISO 11126 compliant. Fine garnet creates a clean anchor pattern, prevents post-coating pitting, and lets you coat directly. Ideal for food equipment, chemical tanks, marine parts.

 

 

2. Aluminum – Gentle but Effective

Use 80 or 100 mesh sub-angular river garnet. Removes oxidation without gouging. Surface roughness: 10–25 µm. Smooth finish ready for painting. Best for extrusions, automotive, aircraft, precision parts.

 

 

3. Carbon Steel – Versatility Matters

Use 30/60 mesh (most popular). Fast cleaning, low dust, 50–85 µm profile for epoxies. Recyclable up to 5 times – cuts cost by 60%.

Pro tip: 20/40 for heavy rust; 80 mesh is too fine for large steel surfaces.

Best for bridges, tanks, structural steel, pipes.

 

 

4. Ship Hulls – Compliance First

Use 20/40 for heavy rust removal; 30/60 for final prep. Requires chloride <25ppm, PSPC/ISO 11126 certified. Prevents under-coating corrosion, delivers 40–75 µm roughness for 15+ years in saltwater. Best for newbuild, dry-dock, offshore platforms.

 

 

Why SEPPE River Garnet?

 

○ Precise particle size distribution

○ Low dust, chloride <25ppm, no free silica

○ Compliant with ISO 11126, PSPC

○ Available in 20/40, 30/60, 80 mesh & custom grades

○ Served offshore wind, shipbuilding, and bridge projects—100% audit pass rate

 

Still not sure? Contact SEPPE for a free material-based recommendation.

Contact us:info@seppe.cn