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Protect Your People
Comparison of Classifications
ISO Class Fed. Std. Particle Concentration Limit (per
Class cubic meter)
1 10 @ 0.1 µm to 2 @ 0.2 µm
2 100 @ 0.1 µm to 4 @ 0.5 µm
3 1 1,000 @ 0.1 µm to 8 @ 1 µm
4 10 10,000 @ 0.1 µm to 83 @ 1 µm
5 100 100,000 @ 0.1 µm to 29 @ 5 µm
6 1,000 1,000,000 @ 0.1 µm to 293 @ 5 µm
7 10,000 352,000 @ 0.5 µm to 2,930 @ 5 µm
8 100,000 3,520,000 @ 0.5 µm to 29,300 @ 5
