ETFE
Ethylene Tetrafluoroethylene
Glass Transition (Tg)
~110 °C
Melting Point (Tm)
265–270 °C
Density
1.70 g/cm³
CAS Number
25038-71-5
Recycling Code
♺ 7
Category
High-Performance
Repeat Unit
–[CH₂–CH₂]ₓ–[CF₂–CF₂]ᵧ–
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
Tougher and stronger than PTFE with high transparency (~95 % light); self-cleaning; roughly 1 % the weight of glass for the same area.
Applications
Stadium roof cushions (Allianz Arena), greenhouse film, aerospace wiring.