ISO 14644-1 clean room standards |
||||||
Class |
0.1 micron |
0.2 micron |
0.3 micron |
0.5 micron |
1 micron |
5 micron |
ISO 1 |
10 |
2 |
|
|
|
|
ISO 2 |
100 |
24 |
10 |
4 |
|
|
ISO 3 |
1,000 |
237 |
102 |
35 |
8 |
|
ISO 4 |
10,000 |
2,370 |
1,020 |
352 |
83 |
|
ISO 5 |
100,000 |
23,700 |
10,200 |
3,520 |
832 |
29 |
ISO 6 |
1,000,000 |
237,000 |
102,000 |
35,200 |
8,320 |
293 |
ISO 7 |
|
|
|
352,000 |
83,200 |
2,930 |
ISO 8 |
|
|
|
3,520,000 |
832,000 |
29,300 |
ISO 9 |
|
|
|
35,200,000 |
8,320,000 |
293,000 |
| Min and max particle size examples in microns. | ||
Material |
Min size |
Max size |
Paper fiber |
5 |
1000 |
Starch |
3 |
100 |
Clay |
0.1 |
50 |
Calcite |
2 |
40 |
Printer's ink |
0.5 |
15 |
Quartz |
1.2 |
125 |
Silicon |
0.5 |
150 |
Feldspar |
2 |
40 |
Fly ash |
1 |
1000 |
Iron |
4 |
20 |
Steel |
2 |
20 |
Tobacco smoke |
0.01 |
4 |
Human hair |
40 |
300 |
Oil aerosol |
0.03 |
1 |
Silicon carbide |
0.5 |
100 |
Conversion Chart |
||
Microns |
Inches |
Millimeters |
10 |
0.0004 |
0.01 |
25 |
0.001 |
0.025 |
50 |
0.002 |
0.05 |
100 |
0.004 |
0.1 |
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