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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 sealant joint tape  other name eptfe self-adhesive flange t