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ISO 14644 classifies the cleanliness of cleanrooms (zones) and associated controlled environments based on the only indicator of suspended particle concentration, and only considers the cumulative distribution of particle size limits (lower limits) in the range of 0.1um to 5.0um. Particle swarm.
According to the particle diameter, it can be divided into conventional particles (0.1um to 5.0um), ultrafine particles (<0.1um), and macro particles (>5.0um).
Air cleanliness grading standard: ISO14644-1 (international standard)
Air cleanliness level (N)
Maximum concentration limit of particles greater than or equal to the specified particle size (pieces per cubic meter of air particles)
0.1 um
0.2 um
0.3 um
0.5um
1um
5 um
ISO Class 1
10
2
ISO Class 2
100
twenty four
10
4
ISO Class 3
1 000
237
102
35
8
ISO Class 4
10 000
2 370
1 020
352
83
ISO Class 5
100 000
23 700
10 200
3 520
832
29
ISO Class 6
1 000 000
237 000
102 000
35 200
8 320
293
ISO Class 7
352 000
83 200
2 930
ISO Class 8
3 520 000
832 000
29 300
ISO Class 9
35 200 000
8 320 000
293 000
Note: Due to the uncertainty involved in the measurement process, it is required to use no more than three valid concentration numbers to determine the level.
Air cleanliness grading standard: GB/T16292-1996 (Chinese standard)
Particle size, numerical cleanliness level
Maximum allowable dust / cubic meter
Maximum allowable number of microorganisms
≥0.5um
≥5um
Floating bacteria / cubic meters
Settling bacteria/dish
Level 100
3,500
0
5
1
10,000 levels
350,000
2,000
100
3
100,000 level
3,500,000
20,000
500
10
300,000
10,500,000
60,000
-
15
US Federal Standard 209D Cleanroom Rating: (Deactivated)
Air cleanliness level (N)
Maximum concentration limit of particles greater than or equal to the specified particle size (pieces per cubic meter of air particles)
0.1 um
0.2 um
0.3 um
0.5um
5 um
1
35
7.5
3
1
10
350
75
30
10
100
750
300
100
1000
1000
7
10000
10000
70
100000
10000
700
UK 5295 Standard Cleanroom and Air Purification Unit Rating:
Air cleanliness level (N)
Maximum concentration limit of particles greater than or equal to the specified particle size (pieces per cubic meter of air particles)
0.3um
0.5um
5um
10um
25 um
C
100
35
0
D
1000
350
0
E
10000
3500
0
F
3500
0
G
100000
35000
200
0
H
35000
200
0
J
350000
2000
450
0
K
3500000
20000
4500
500
L
200000
45000
5000
M
450000
50000
Comparison of various international standards:
United States federal
United States federal
British standard
Australian Standard
French standard
German standard
International standard
Japanese standard
Standard 209D
Standard 209E
BS5295
AS1386
AFNORX44101
VDI2083
14644-1
JACA24
1
1
-
0
2
2
1
M1.5
C
0.035
-
1
3
3
10
M2.5
D
0.35
-
2
4
4
100
M3.5
E
3.5
4000
3
5
5
1000
M4.5
G
35
-
4
6
6
10000
M5.5
J
350
400000
5
7
7
100000
M6.5
K
3500
4000000
6
8
8
M
7
9
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