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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 |
| 3½ |
.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
3½
4 |
3½
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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