Explain various grades of powders

Explain various grades of powders
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According to IP 2010 official grades of powders are as follows:

 i. Coarse powder: A powder of which all particles pass through sieve no 10 with nominal aperture size 1.7mm and not more than 40% pass through sieve no 44 with nominal aperture size 355um.

 ii. Moderately Coarse powder: A powder of which all particles pass through sieve no 22 with nominal aperture size 710um and not more than 40% pass through sieve no 60

with nominal aperture size 250um.

iii. Moderately fine powder: A powder of which all particles pass through sieve no 44 with nominal aperture size 355um and not more than 40% pass through sieve no 85 with nominal aperture size 180um.

iv. Fine powder: A powder of which all particles pass through sieve no 85 with nominal aperture size 180 um.

v.Very fine powder: A powder of which all particles pass through sieve no 120 with nominal aperture size 125 um.

Vi. Microfine powder: A powder of which not less than 90%by weight of particles pass through a sieve with nominal mesh aperture size of 45 um

vii. Superfine powder: A powder of which not less than 90%by weight of particles are less than 10 µm in size.
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