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the Blast Cleaning &
Coating Industry

Blast-One Weekly Tips
Tip #91
How do I select the right grade of abrasive?

When preparing your blasting project it is vital to use an abrasive grade (size) that will give you the best performance. If the wrong size abrasive is used productivity can be reduced and abrasive consumption can be excessive.

There are two facts to take into consideration when choosing abrasive.


Abrasive blasting works by using the impact of each grain of sand hitting the surface to “chip off” the unwanted material. Therefore the more impacts you can get the quicker the job gets done. To increase the number of impacts you need to increase the number of grains of abrasive hitting the surface. These increases are achieved by reducing grain size. (More grains per volume of abrasive = more impacts = more production)

Garnet Size Comparison

The relationship between the abrasive particle size and contaminant thickness requiring removal needs to be considered to ensure maximum productivity. This is because fast contaminant removal is dependent on the abrasive particle being of sufficient size to cut through the contaminant and impact directly on the substrate.

Garnet Size Comparison
Garnet Size Comparison

A: Abrasive Particle (too small)
B: Contaminant
C: Substrate
D: Abrasive Particle (correct size)
E: Removed Contaminant

The correct grade of abrasive is the finest one that closest matches the thickness of the contaminant being removed.

Coating thickness to abrasive size comparison
Garnet Size Comparison
Profile requirement
Garnet Size Comparison
Watch the video on 'Choosing the correct abrasive size' here


View our range of abrasives.

Contact Blast-One to talk to our team of experts for help choosing abrasive suitable for your blast project.


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