68
ISO Cleanliness Code
Hydraulic Fluid Contamination
ISO code
number
Number of particles per ml
More than Up to and
including
22 20,000 40,000
21 10,000 20,000
20 5,000 10,000
19 2,500 5,000
18 1,300 2,500
17 640 1,300
16 320 640
15 160 320
14 80 160
13 40 80
12 20 40
11 10 20
10 510
09 2.5 5
08 1.3 2.5
07 0.64 1.3
