1. 
   PTFE
   acronym: polytetrafluoroethylene
   Found op http://cdiac.ornl.gov/pns/acronyms.html#P
   
   
2. 
   PTFE
   polytetrafluoroethylene
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   PTFE
   tape Tape made from polytetrafluorethylene, used to seal threaded plumbing fittings.
   Found op http://www.victoriaplumb.com/bathroom_DIY/a-to-z-bathroom-glossary.html
   
   
4. 
   ptfe
   1) Polytetrafluoroethylene
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/ptfe/1
   
   

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