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■USA Federal Standard


Reference for Airborne Particulate Matter Cleanliness Classification
Airborne Particulate Matter Cleanliness Classifications  Max concentration limit of airborne particular matter as per cubic/square meters
ISO14644-1
FED STD 209E
CLASS
Number of Par Cubic Meter by Micrometer Size
ISO Class
English
Metric
0.1um
0.2um
0.3um
0.5um
1um
5um
1
ISO1
10
2
2
ISO2
100
24
10
4
3
1
M1.5
1SO3
1,000
237
102
35
8
4
10
M2.5
ISO4
10,000
2,370
1,020
352
83
5
100
M3.5
ISO5
100,000
23,700
10,200
3,520
832
29
6
1,000
M4.5
ISO6
1,000,000
237,000
102,000
35,200
8,320
293
7
10,000
M5.5
ISO7
352,000
83,200
2,930
8
100,000
M6.5
ISO8
3,520,000
832,000
29,300
9
ISO9
35,200,000
8,320,000
293,000

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