ISO 23181:2007 specifies a method for determining the resistance of a hydraulic filter element to flow fatigue when subjected to high viscosity fluid, using a uniformly varying flow rate up to a predetermined terminal differential pressure and a controlled waveform.
It establishes a method for verifying the ability of a filter element to withstand the flexing caused by cyclic differential pressures induced by a variable flow rate.
BS ISO 23181:2007 history
2007BS ISO 23181:2007 Hydraulic fluid power - Filter elements - Determination of resistance to flow fatigue using high viscosity fluid