Sandpaper of P220 grit is estimated by the mesh in holesinch

Sandpaper of P220 grit is estimated by the mesh in holes/inch (in this case 220). The wire of the sieve is .0475 mm. What is the maximum diameter of the sandpaper grit (abrasive particles)?

Solution

No of square holes per inch = 220

Width of one hole = 25.4 mm/220 = 0.1154 mm

spacing of hole after subtracting the diameter of wire = 0.1154 - 0.0475 = 0.0679 mm or 67.9 microns.

The maximum diameter of the sandapaper grit is 67.9 microns.