It was found that during the mechanical cycles, packing friction was very low so that the friction of the combined two part packing assembly with {TAIL ~ PTFE} and graphite material is significantly less than {HEAD ~ the friction} of a sole graphite packing system with similar leakage characteristics 
It was found that during the mechanical cycles , packing friction was very low so that the friction of the combined two part packing assembly with { TAIL ~ PTFE } and graphite material is significantly less than { HEAD ~ the friction } of a sole graphite packing system with similar leakage characteristics
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