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Classification of clean rooms
Feb 22 , 2022

Clean rooms are classified according to the cleanliness of the air. Specific particle count measurements and calculations are required by the clean room classification standard ISO 14644-1, which specifies the decimal logarithm of the number of particles of 0.1 µm or more allowed per cubic meter of air to classify the cleanliness level of the clean room or clean area.


ISO 14644-1 Clean room Standards

Class

maximum particles/m3

FED STD 209E
equivalent

>=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

 

Class 1

ISO 4

10,000

2,370

1,020

352

83

 

Class 10

ISO 5

100,000

23,700

10,200

3,520

832

29

Class 100

ISO 6

1,000,000

237,000

102,000

35,200

8,320

293

Class 1,000

ISO 7

 

 

 

352,000

83,200

2,930

Class 10,000

ISO 8

 

 

 

3,520,000

832,000

29,300

Class 100,000

ISO 9

 

 

 

35,200,000

8,320,000

293,000

Room Air

Clean room is a controlled environment with low pollutant level. It is usually used in electronic manufacturing, food production, medical product research and scientific laboratory.

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