Appendix F
52
Hydraulic System Target Cleanliness Levels
Contamination
Corresponding
Recommended
Typical
Codes
Codes
Filtration
Applications
ISO 4406:1999
NAS 1638
Degree
4
6
14
Bx200
μm(c)
μm(c)
μm(c)
14
12
9
3
3
High precision and
laboratory servo-sys-
tems
17
15
11
6
3-6
Robotic and
servo-systems
18
16
13
7
10-12
Very sensitive - high
reliability systems
20
18
14
9
12-15
Sensitive - reliable
systems
21
19
16
10
15-25
General equipment of
limited reliability
23
21
18
12
25-40
Low - pressure equip-
ment not in continu-
ous service
The table above is a guide to the recommended filtration level for various
hydraulic components, together with typical target system cleanliness levels.
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