Sandpaper consists abrasive particles glued to a sheet of paper or cloth. The size of the abrasive particles is used to classify the sandpaper and usually correlates with use.
Macrogrit sandpaper has larger particles (>= 60 microns).
Microgrit sandpaper has smaller particles.
Particle Diameter
Term
> 500 microns
extra coarse
300 to 500
coarse
190 to 299
medium
101 to 189
fine
60 to 100
very fine, macrogrit
40 to 59 microns
very fine, microgrit
25 to 39 microns
extra fine
15 to 24 microns
super fine
< 15 microns
ultra fine
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