Surface Profile Information
Surface profile will be affected by a number of factors:
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The hardness of the surface to be blasted
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The hardness and size of the abrasive being used
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The velocity or speed at which the abrasive impacts the surface
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The degree of contamination or coating on the surface
When choosing a steel abrasive to obtain a specific mil profile, the following information will be helpful:
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Steel grit will leave an angular indentation or pitted surface which helps a coating adhere to the surface
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Steel shot will leave a rounded or saucer-shaped indentation on the surface
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GH grit will clean and profile a surface faster than the other hardness grits but will break down faster.
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GL grit will maintain most of its angularity throughout its life and still be very productive but will break down slower than a GH grit. This is the ideal grit hardness for most air blast applications.
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GM grit will round off quicker than a GL and GH grit, affecting the consistency and pattern of the profile, but will last a little longer
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GS grit is recommended more for wheel blast application than air blast applications. Steel shot is typically the recommended abrasive for wheel blast machines.
