PTFE
Polytetrafluoroethylene (Teflon)
Glass Transition (Tg)
-97 & 126
Melting Point (Tm)
327 °C
Density
2.14–2.20 g/cm³
CAS Number
9002-84-0
Recycling Code
♺ 7
Category
High-Performance
Repeat Unit
–[CF₂–CF₂]ₙ–
The repeating unit is the smallest structural fragment whose repetition builds the whole chain. Subscripts show the relative share of each unit in copolymers.
Key Properties
Lowest coefficient of friction of any solid (~0.04); chemically inert to virtually everything; extremely high melt viscosity means it must be sintered, not melt-processed; poor creep resistance.
Applications
Non-stick cookware, chemical gaskets, PTFE tape, low-friction bearings.