The maker publishes these figures. A single value per grade, no distribution given, so each is drawn as a point.
Each grade below shows its size in microns, its spread (the published distribution, where a maker or standard gives one; most makers publish none), and where that size lands on the reference scale, a shared yardstick for reading grit numbers across makers.
Particle sizemicrons, log
1005030201053
coarserfiner
inkmeasured or standardmaker figureour estimate
shapeknown distributionpoint, spread unknown
F46Maker-published
Venev
300 µm
Cubic boron nitride (CBN), metallic (copper-tin) bond; maker states 300 micron for FEPA-F 46.