PCTFE
Polychlorotrifluoroethylene
Glass Transition (Tg)
~45 °C
Melting Point (Tm)
210–215 °C
Density
2.10–2.13 g/cm³
CAS Number
9002-83-9
Recycling Code
♺ 7
Category
High-Performance
Repeat Unit
–[CF₂–CFCl]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 water-vapour transmission of any plastic; retains properties at cryogenic temperatures.
Applications
Pharmaceutical blister barrier film, cryogenic seals, valve seats.