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SYNTHETIC ABRASIVE GRAIN SIZES

AVERAGE PARTICLE SIZE
GRIT NUMBER INCHES MICRONS
6 0.120 3070
8 0.087 2210
10 0.073 1854
12 0.063 1600
14 0.053 1346
16 0.043 1092
20 0.037 940
24 0.027 686
30 0.022 559
36 0.019 483
46 0.014 356
54 0.012 305
60 0.010 254
70 0.008 203
80 0.0065 165
90 0.0057 145
100 0.0048 122
120 0.0040 102
150 0.0035 89
180 0.0030 76
220 0.0025 63
240 0.0021 53
280 0.0015 37
320 0.0012 30
400 0.00071 18
500 0.00051 13
600 0.00035 9
800 0.00028 7
1000 0.00020 5
1200 0.00012 3

Abrasive sizes 240 and coarser are controlled by screen tests in accordance with American National Standards Institute (ANSI) B74.12-1976.

Finer sizes are tested by Sedimentation or Microscopic methods for conformity to established standards.



PARTICLE SIZE
US MESH/GRIT INCHES MICRONS* MILLIMETERS
3 .265 6730 6.73
.223 5660 5.66
4 .187 4760 4.76
5 .157 4000 4.00
6 .132 3360 3.36
7 .111 2830 2.83
8 .0937 2380 2.38
10 .0787 2000 2.00
12 .0661 1680 1.68
14 .0555 1410 1.41
16 .0469 1190 1.19
18 .0394 1000 1.00
20 .0331 841 .84
25 .0280 707 .71
30 .0232 595 .59
35 .0197 500 .50
40 .0165 420 .42
45 .0138 354 .35
50 .0117 297 .297
60 .0098 250 .250
70 .0083 210 .210
80 .0070 177 .177
100 .0059 149 .149
120 .0049 125 .125
140 .0041 105 .105
170 .0035 88 .088
200 .0029 74 .074
230 .0024 63 .063
270 .0021 53 .053
325 .0017 44 .044
400 .0015 37 .037

*PROPOSED ISO (INTERNATIONAL) STANDARDS


COMPARISON OF HARDNESS VALUES
Substance Knoop Mohs
Talc - 1
Gypsum 32 2
Cadmium 37 -
Silver 60 -
Zinc 119 -
Calcite 135 3
Flourite 163 4
Copper 163 -
Magnesia 370 -
Apatite 430 5
Glass (Soda Lime) 540 -
Nickel 557 -
Feldspar (Orthoclase) 560 6
Tool Steel (Rockwell C 60.5) 740 -
Quartz 820 7
Chromium 935 -
Zirconia 1160 -
Beryllia 1250 -
Topaz 1340 8
Garnet 1360 -
Alumina Zirconia 1450 -
Zirconium Boride 1550 -
Titanium Nitride 1800 9
Tungsten Carbide 1880 -
Tantalum Carbide 2000 -
Zirconium Carbide 2100 -
Alumina 2100 9
Beryllium Carbide 2410 -
Titanium Carbide 2470 -
Silicon Carbide 2480 -
Aluminum Boride 2500 -
Boron Carbide 2750 -
Diamond 7000 10



ANSI Table 2


ALLOWABLE LIMITS FOR THE SIZING OF ALUMINUM OXIDE AND SILICON CARBIDE ABRASIVE GRAIN FOR GRINDING WHEEL MANUFACTURE AND GENERAL POLISHING

Grit No. Sieve through which 100% must pass Control sieve Maximum of over size on control sieve Minimum through control sieve and retained Cumulative minimun through control sieve and retained Maximum of 3% through sieve No.1
No. Opening Inches Percent Percent On sieve No.1 Percent On sieve No.1
4
5
6
7
5/16
.265

4

4
5
6
0.223
0.187
0.157
0.132
20
20
20
20
40
40
40
40
4
5
6
7
70
70
70
70
4 and 5
5 and 6
6 and 7
7 and 8
6
7
8
10
8
10
12
14
16
5
6
7
8
10
7
8
10
12
14
0.111
.0937
.0787
.0661
.0555
20
20
20
20
20
45
45
45
45
45
8
10
12
14
16
70
70
70
70
70
8 and 10
10 and 12
12 and 14
14 and 16
16 and 18
12
14
16
18
20
20
24
30
36
46
12
16
18
20
30
16
20
25
30
40
.0469
.0331
.0278
.0234
.0165
20
25
25
25
30
45
45
45
45
40
18
25
30
35
45
70
65
65
65
65
18 and 20
25 and 30
30 and 35
35 and 40
45 and 50
25
35
40
45
60
54
60
70
80
90
35
40
45
50
60
45
50
60
70
80
.0139
.0117
.0098
.0083
.0070
30
30
25
25
20
40
40
40
40
40
50
60
70
80
100
65
65
65
65
65
50 and 60
60 and 70
70 and 80
80 and 100
100 and 120
70
80
100
120
140
100
120
150
180
220
70
80
100
120
140
100
120
140
170
200
.0059
.0049
.0041
.0035
.0029
20
20
15
15
15
40
40
40
40
40
120
140
200
200 and 230
230 and 270
65
65
65
65
60
120 and 140
140 and 170
200 and 230
200, 230 and 270
230, 270 and 325
200
230
325
---
---
240 170 200 .0029 5 8 230 and 270 38 230, 270 and 325 ---

1) The sieves referred to are those of the United States Sieve Series, described in table 1, which have been in conformance with the AGA Standard Sands.



ANSI Table 3


ALLOWABLE LIMITS FOR THE SIZING OF ABRASIVE GRAINS FOR USE IN OTHER GENERAL INDUSTRIAL USES SUCH AS PRESSURE BLASTING AND LITHOPLATE GRAINING

Grit No. Sieve through which 100% must pass Control sieve Maximum of over size on control sieve Minimum through control sieve and retained Cumulative minimun through control sieve and retained Maximum of 3% through sieve No.1
No. Opening Inches Percent Percent On sieve No.1 Percent On sieve No.1
16
20
24
30
36
46
8
10
14
16
18
25
14
16
18
20
25
40
0.0555
.0469
.0394
.0331
.0278
.0165
25
25
25
30
15
30
35
35
35
45
50
30
16
18
20
30
35
45
70
70
60
60
80
55
16 and 18
18 and 20
20 and 25
30 and 35
35 and 40
45 and 50
25
30
40
45
50
70
54
60
70
80
90
30
35
40
45
50
45
50
60
70
80
.0139
.0117
.0098
.0083
.0070
35
35
25
35
25
25
35
35
30
35
50
60
70
80
100
60
60
65
60
60
50 and 60
60 and 70
70 and 80
80 and 100
100 and 120
80
100
120
140
170
100
120
150
180
220
60
70
80
80
100
100
120
140
170
200
.0059
.0049
.0041
0035
.0029
25
25
25
20
15
30
20
30
30
30
120
140
200
200 and 230
230 and 270
55
50
60
60
50
120 and 140
140 and 170
200 and 230
200, 230 and 270
230, 270 and 325
230
270
325
---
---
240 120 200 .0029 10 5 230 and 270 30 230, 270 and 325 ---

1) The sieves referred to are those of the United States Sieve Series, described in table 1, which have been in conformance with the AGA Standard Sands.
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