Frequently Asked Questions
Summary Of Different Clean Room Standards
US FED STD 209E Cleanroom standards
| particle/ft³ | |||||
| Class | 0.1 µm | 0.2 µm | 0.3 µm | 0.5 µm | 5 µm |
| 1 | 35 | 7 | 3 | 1 | |
| 10 | 350 | 75 | 30 | 10 | |
| 100 | 750 | 300 | 100 | ||
| 1000 | 1000 | 7 | |||
| 10,000 | 10,000 | 70 | |||
| 100,000 | 100,000 | 700 | |||
Please note that the US FED standard 209E was cancelled on November 29th 2001 and has been superseded by ISO 14644
ISO 14644-1 Cleanroom standards
| particle/m³ | ||||||
| Class | 0.1 µm | 0.2 µm | 0.3 µm | 0.5 µm | 1 µm | 5 µm |
| 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 | |||
Cleanroom class comparison between US FED 209E and ISO 14644-1
| ISO 14644-1 | FED STD 209E |
| ISO 3 | 1 |
| ISO 4 | 10 |
| ISO 5 | 100 |
| ISO 6 | 1,000 |
| ISO 7 | 10,000 |
| ISO 8 | 100,000 |
BS 5295 Cleanroom standards
| particle/m³ | |||||
| Class | 0.5 µm | 1 µm | 5 µm | 10 µm | 25 µm |
| Class 1 | 3,000 | 0 | |||
| Class 2 | 300,000 | 3,000 | 30 | ||
| Class 3 | 1,000,000 | 20,000 | 4,000 | 300 | |
| Class 4 | 200,000 | 40,000 | 400 | ||
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