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Particle Size Conversions

Sieve Size Conversion Chart

Sieve
US Mesh
Sieve
Tyler
Sieve
British
standard
Opening
(microns)
Opening
(inches)
  2.5   7920 0.312
2.5     8000 0.315
3     6730 0.265
  3.0   6680 0.263
3.5     5660 0.223
  3.5   5610 0.221
4     4750 0.187
  4   4700 0.185
5     4000 0.157
  5   3960 0.156
6   5 3350 0.132
  6   3360 0.131
7   6 2830 0.111
  7   2790 0.110
8 8 7 2380 0.094
10 9 8 2000 0.079
12   10 1680 0.066
  10   1650 0.065
14 12 12 1410 0.055
16   14 1190 0.047
  14   1170 0.046
18 16 16 1000 0.039
20 20 18 840 0.033
25 24 22 710 0.028
30 28 25 590 0.023
35 32 30 500 0.020
40 35 36 420 0.0165
45 42 44 350 0.0138
50 48 52 297 0.0117
60 60 60 250 0.0098
70 65 72 210 0.0083
80 80 85 177 0.0070
100 100 100 149 0.0059
120 115 120 125 0.0049
140 150 150 105 0.0041
170 170 170 88 0.0036
200 200 200 74 0.0029
    240 66 0.026
230 250   62 0.0024
270 270   53 0.0021
325 325   44 0.0017
400     38 0.0015
550     25 0.0009
635     20 0.00079
1000     13 0.00050
1200     10.2 0.00039
2300     6 0.00025


Grind Gauge and Blaine Number Conversion Chart

Particle Diameter
Microns
Particle Diameter
Inches
Grind gauge
Hegman NS
Grind gauge
Production Club
Blaine number
102 0.0040 0 0  
95.3 0.00375 0.5    
91.4 0.0036   1  
88.9 0.0035 1    
82.6 0.00325 1.5    
81.3 0.0032   2  
76.2 0.003 2    
71.1 0.0028   3  
69.9 0.0275 2.5    
63.5 0.0025 3    
61 0.0024   4  
57.2 0.00225 3.5    
50.8 0.002 4 5  
44.5 0.00175 4.5   3000
40.6 0.0016   6  
38.1 0.0015 5   3300
31.8 0.00125 5.5    
30.5 0.0012   7  
25.4 0.0009 6   4000
20.3 0 0008   8
19.1 0.00075 6.5   4600
12.7 0.00050 7   5700
6.4 0.00025 7.5 9 8000
0 0 8 10  

Blaine Formula     P = 85% passing
P = [ 20303/Blaine number ] 2 microns