Surface Profile and Abrasive Size: What You Need to Know

Understanding Abrasive Size vs Surface Profile

When selecting abrasives for surface preparation, it’s crucial to understand the relationship between abrasive size and the resulting surface profile. The surface profile affects coating adhesion, making it a key factor in ensuring the longevity and effectiveness of coatings.

Nozzle Blasted Abrasives

The relationship between abrasive size and surface profile is illustrated in the chart below for nozzle blasted abrasives. Garnet and chilled iron grit, two commonly used abrasives, produce different profiles based on their size.

• Garnet: Typically produces a more consistent and finer profile, making it suitable for applications where precision and minimal dust generation are critical.
• Chilled Iron Grit: Known for creating a rougher profile, it’s ideal for heavy-duty applications requiring significant surface roughness for optimal coating adhesion.

Garnet – Nozzle Blasted (left) and Chilled Iron Grit – Nozzle Blasted (right)

Airless Wheel Blasted Abrasives

In wheel blasting, the size of the abrasive also plays a significant role in determining the surface profile. This method, often used for large-scale operations, benefits from the high impact energy of the abrasives.

• Cast Steel Shot: Offers a balanced profile, providing both cleaning efficiency and a suitable anchor pattern for coating.
• Chilled Steel Grit: Produces a more aggressive profile, making it ideal for surfaces requiring a strong mechanical bond.

Cast Steel Shot – Wheel Blasted (left) and Chilled Steel Grit – Wheel Blasted (right)

Conclusion

Understanding how abrasive size correlates with surface profile is essential for selecting the right abrasive for your blasting operation. Whether you are using nozzle or wheel blasting techniques, selecting the appropriate abrasive size will ensure optimal surface preparation and coating performance.