B.89.809 Rev C
26
© Parker Hannifin, 2015
www.parker.com/hfde
Target
contamination
class to
ISO 4406
Suggested
maximum
particle level
Sensitivity Type of system
Typical components
6 µm
14 µm
6 µm
14
µm
13
9
4,000
250
Super
critical
Slit-sensitive control
systems with very high
reliability. Laboratory or
aerospace.
High performance
servo valves
15
11
16,000
1,000
Critical
High performance servo
and high pressure long life
systems, e.g. aircraft,
machine tools etc.
Industrial servo
valves
16
13
32,000
4,000
Very
important
High quality reliable
systems. General machine
requirements.
Piston pumps,
proportional valves,
compensated flow
controls
18
14
130,000
8,000
Important
General machinery and
mobile systems. Medium
pressure, medium capacity.
Vane pumps, spool
valves
19
15
250,000
16,000
Average
Low pressure heavy
industrial systems, or
applications where long lift
is not critical.
Gear pumps, manual
and poppet valves,
cylinders.
21
17
1,000,000 64,000
Main
protection
Low pressure systems with
large clearances.
Ram pumps
ISO contamination charts
Typical system applications and code numbers
These typical applications and ISO code numbers are taken from the UK Contamination and Control Research
Programme (1980
– 1984)
Summary of Contents for icountBS
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