STANDARDS  FOR MICRON SIZED  DIAMOND/CBN POWDERS
[CS 261-61] [PS 62-74] [ANSIB74.20 ] FEPA 1977 90% Range IDA Std. 1985
Size Desig-nation µm Nominal Range µm Maximum Oversize µm Largest Nominal To Maximu  m FEPA Desiguation Flonest Complying Average µm Coarest Complying µm Maximum Particle µm Size Grade Number µm Nominal Size Range µm VariMean From Grade % Maximum Permissible Particle Size µm
                         
                  1/4 0-1/2 +10 3/4
1-2 0-1  1/2 5           1/2 0-1 +10 1/2
1 0-2 3 5 M1.0 0.5-1.5 0.5-1.5 0.5-1.5 2.8 1 0-2 +10 3
        M1.6 1-2 1-2.5 1-2.5 4.5 2 1-3 +10 4
3 2-4  5 5 M2.5 1.5-3 1.5-3.5 1.5-4 6.5 3 2-4 +10 6
        M4.0 2-5 2.5-5.5 2.5-6.5 10 4 2-6 +10 8
                  5 4-6 +10 8
6 4-8  10 5           6 4-8 +10 10
        M6.3 3.5-8 4-9 4-10 15 8 6-10 +10 12
9 8-12  14 5                  
        M10 5.5-13 6-14 6.5-15 24 10 8-12 +10 14
                  12 8-16 +10 19
15 12-22 25 3           15 10-20 +10 23
        M18 9-19 10-22 11-25 35 17 12-22 +10 25
        M25 14-30 16-34 18-38 55 20 15-25 +10 29
                  25 20-30 +10 34
30 22-36 40 3           30 22-36 +10 40
        M40 24-48 27-53 30-58 80 35 30-40 +10 45
45 35-54 58 2           45 36-54 +10 60
                  50 40-60 +10 67
60 54-80 85 2                  
        M63 38-74 42-84 47-88 126 67 54-80 +10 90

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