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ISO 14644-1 Cleanroom Standards
Mark Optics has an Outer Class 8 Clean Room that has tested at 13,000–18,000 particles size 0.5 um, our Inner Room is a Class 6 and under the hood is a Class 5.
Collected from Wikipedia.com.
Though originating in the United States, the standard Federal Standard 209E was the first and most commonly referred to. This standard was replaced in 1999 by an international standard, however Federal Standard 209E remains today the most widely referenced standard in the world.
US FED STD 209E Cleanroom Standards
Class
0.1 µm
0.2 µm
0.3 µm
0.5 µm
1 µm
5 µm
1
35
7
3
10
350
75
30
100
3500
750
300
1,000
10,000
100,000
The Replacement standard is ISO 14644-1 and is meant to completely replace Federal Standard 209E. Each of these standards represents the maximum allowable number of particles in a unit of air. The typical unit is either cubic feet or cubic meters. The particle counts are always listed as cumulative.
particle/m³
1.0 µm
5.0 µm
ISO 1
2
ISO 2
24
4
ISO 3
237
102
8
ISO 4
2,370
1,020
352
83
ISO 5
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
Cleanroom Class Comparison
ISO 14644-1
FED STD 209E
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