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Hydraulic Fluid Filtration

Doering recommended degree of contamination of hydraulic fluid per ISO 4406:

General industrial and mobile equipment operating at pressures to 3,000 PSI (210 bar) for spool and poppet-type valves.

Minimum Filtration ISO 4406 Recommended Filtration for extended product life
4um/6um/14um
20/18/14
4um/6um/14um
17/15/13