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Glass bead grain size numbers are in conformity with FEPA standards, 1971
CHEMICAL ANALYSIS AND COMPONENTS
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Glass bead grain number
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Micron
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Mesh
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40-70
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40-70
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200-325
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70-100
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70-100
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120-200
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100-200
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100-200
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70-140
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150-250
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150-250
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60-100
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200-300
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200-300
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50-70
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300-400
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300-400
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40-50
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400-800
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400-800
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20-40
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Mesh: = fineness number, i.e. the number of openings in one square inch.
Micron = 10 -3 m : abrasive grain size average
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