Polytetrafluoroethylene (6)
I believe the answer is:
teflon
'polytetrafluoroethylene' is the definition.
(synonyms)
This is all the clue.
(Other definitions for teflon that I've seen before include "Synthetic resin to prevent sticking" , "Non-stick coating - evading blame" , "Non-stick coating (trademark)" , "Non-stick coating as for frying pans" , "It's coated on surface to prevent sticking" .)