1 Scope
This document describes the following:
— a multi-pass filtration performance test with continuous contaminant injection for
hydraulic fluid power filter elements;
NOTE 1 For the background interlaboratory study used to verify the test methodology, see
Annex D.
— a procedure for determining the contaminant capacity, particulate removal and differential pressure characteristics;
— 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 reservoir gravimetric level of less than 200 mg/L;
NOTE 2 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.
— a test using ISO medium test dust (ISO MTD) contaminant and a test fluid in accordance
with Annex A.
This document is intended to provide a test procedure that yields reproducible test
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