|
Mesh
 |
 |
 |
 |
 |
Sieve
Size No.
US Mesh
|
Theoretical
Sieve
Opening
Micron
|
Sieve
Opening
ASTME II
Micron
|
FEPA
Size No.
|
Approx. No.
of stones
per carat
|
| 18 |
1000 |
1000 |
D1001 |
110 |
| 20 |
841 |
850 |
D851 |
180 |
| 25 |
707 |
710 |
D711 |
310 |
| 30 |
595 |
600 |
D601 |
510 |
| 35 |
500 |
500 |
D501 |
860 |
| 40 |
420 |
425 |
D426 |
1,450 |
| 45 |
354 |
355 |
D356 |
2,450 |
| 50 |
297 |
300 |
D301 |
4,100 |
| 60 |
250 |
250 |
D251 |
6,900 |
| 70 |
210 |
212 |
D213 |
11,600 |
| 80 |
177 |
180 |
D181 |
19,500 |
| 100 |
149 |
150 |
D151 |
32,800 |
| 120 |
125 |
125 |
D126 |
55,200 |
| 140 |
105 |
106 |
D107 |
93,000 |
| 170 |
88 |
90 |
D91 |
156,000 |
| 200 |
74 |
75 |
D76 |
262,000 |
| 230 |
63 |
63 |
D64 |
441,000 |
| 270 |
53 |
53 |
D54 |
742,000 |
| 325 |
44 |
45 |
D46 |
1,250,000 |
| 400 |
37 |
38 |
|
|
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