Table 11 SAE AS4059 cleanliness levels by particle count
Maximum contamination limits (particles/100 mL)
Size, ISO 4402 calibration, or
optical microscope count
1
> 1 µm
> 5 µm
> 15 µm
> 25 µm
> 50 µm
> 100 µm
Size, ISO 11171 calibration, or
electron microscope
2
> 4 µm(c)
> 6 µm(c)
> 14 µm(c) > 21 µm(c) > 38 µm(c) > 70 µm(c)
Size code
A
B
C
D
E
F
Class 000
195
76
14
3
1
0
Class 00
390
152
27
5
1
0
Class 0
780
304
54
10
2
0
Class 1
1560
609
109
20
4
1
Class 2
3120
1220
217
39
7
1
Class 3
6250
2430
432
76
13
2
Class 4
12,500
4860
864
152
26
4
Class 5
25,000
9730
1730
306
53
8
Class 6
50,000
19,500
3460
612
106
16
Class 7
100,000
38,900
6920
1220
212
32
Class 8
200,000
77,900
13,900
2450
424
64
Class 9
400,000
156,000
27,700
4900
848
128
Class 10
800,000
311,000
55,400
9800
1700
256
Class 11
1,600,000 623,000
111,000
19,600
3390
512
Class 12
3,200,000 1,250,000 222,000
39,200
6780
1020
1
Particle size based on the longest dimension.
2
Particle sized based on the projected area equivalent diameter.
English
23
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