CLEANROOM CLASSIFICATION
Class limits [maximum allowable particles per cubic foot (
SI
/209) or meter (
ISO
)]
700
3,520,000
100,000
N/A
N/A
3,450,000
100,000
M 6.5
8
70
352,000
10,000
N/A
N/A
345,000
10,000
M 5.5
7
7
35,200
1,000
N/A
N/A
1,000,000
34,500
1,000
M 4.5
6
0
3520
100
300
750
100,000
3,450
100
M 3.5
5
28.1
991
100
M 3
0
352
10
30
75
10,000
345
10
M 2.5
4
2.83
99.1
10
M 2
0
1
3
7
35
1
M 1.5
35
1
100
35
1
M 1
3
5 micron
0.5 micron
0.3 micron
0.2 micron
0.1 micron
Fed Std 209
SI
ISO
Courtesy of http://www.mcr-1.com/class.html