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 PTFE and graphite material is significantly less than {HEAD ~ the friction} of a sole graphite packing system with {TAIL ~ 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 PTFE and graphite material is significantly less than { HEAD ~ the friction } of a sole graphite packing system with { TAIL ~ similar leakage characteristics }
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