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Expanded  PTFE Valve Stem Packing Expanded PTFE is virgin PTFE to which a  stress resistance has been added by means of molecular rearrangement during  manufacture. This process ensures that the molecular chains from which the PTFE  is constructed,Website:http://www.eptfe-industry.com, do not arrange themselves into set patterns. This means that  expanded PTFE possesses no structural weakness and expands and contracts  equally in all directions. Because no additives are required, expanded PTFE  also possesses the unique chemical resistance of virgin PTFE. Expanded  PTFE Valve Stem Packing is a