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Hydraulic fluid power. Filter elements. Determination of resistance to flow fatigue using high viscosity fluid Ingestion-build-44616 and testers of tubular cored1 Scope This International Standard 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 maximum 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.