Particle Size
If that is the case for 34/60 mesh size that would be material with particles going through a 60 mesh (250μm) sieve but not through 34 mesh (500μm) sieve, while 40/100 would be 425 to 150μm . respectively. The particle size itself will be slightly higher than the grade because grading is based on square mesh. To specify the 34 mesh that ...
