ISO 23369:2021
Hydraulic fluid power — Multi-pass method of evaluating filtration performance of a filter element under cyclic flow conditions
Reference number
ISO 23369:2021
Edition 1
ISO 23369:2021
Withdrawn (Edition 1, 2021)


This document specifies:

a) A multi-pass filtration performance test under cyclic flow conditions with continuous contaminant injection for hydraulic fluid power filter elements.

b) A procedure for determining the contaminant capacity, particulate removal and differential pressure characteristics.

c) A test currently applicable to hydraulic fluid power filter elements that exhibit an average filtration ratio greater than or equal to 75 for particle sizes ≤25 µm(c), and a final test system reservoir gravimetric level of less than 200 mg/L. It is necessary to determine by validation the range of flow rates and the lower particle size limit that can be used in test facilities.

d) A test using ISO12103-1 A3 medium test dust contaminant and a test fluid.

This document provides a test procedure that yields reproducible test data for appraising the filtration performance of a hydraulic fluid power filter element without influence of electrostatic charge.

This document is applicable to three test conditions:

1)    Base upstream gravimetric level of 3 mg/L.

2)    Base upstream gravimetric level of 10 mg/L.

3)    Base upstream gravimetric level of 15 mg/L.

General information

  •  : Withdrawn
     : 2021-06
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 34
  • ISO/TC 131/SC 6
  • RSS updates

Got a question?

Check out our Help and Support

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)