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【范围】
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This SAE Aerospace Recommended Practice (ARP) establishes a method for evaluating the
particulate matter extracted from the working fluid of a hydraulic system or component using a
membrane. The amount of particulate matter deposited on the membrane due to filtering a given
quantity of fluid is visually compared against a standard membrane in order to provide an indication of
the cleanliness level of the fluid. A particular feature of this method is the membrane preparation to
achieve an even particulate distribution on the membrane suitable for other applications.
Membrane evaluation using standard membranes, described in this document, is an alternative
technique to counting with either an optical microscope (ARP598) or an automatic particle counter
(ISO 11500). The latter particle counting procedures are considered more precise. This procedure
shall not be used as an alternative to particle counting unless agreed to by the customer since the
results by this procedure may differ from those by particle counting, even though the standard
membrane correlates to a specific particle count.strRefField
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