General Properties
Short Name:
Name:
ETFE
Ethylene-tetrafluoroethylene
Ethylene tetrafluoroethylene (ETFE) is a semi-crystalline PTFE derivate, but features a lower temperature stability.
Structural Formula
Properties
| Glass Transition Temperature | 75 to 85°C |
|---|---|
| Melting Temperature | 225 to 275°C |
| Melting Enthalpy | 46 J/g |
| Decomposition Temperature | 385 to 400°C |
| Young's Modulus | 1100 MPa |
| Coefficient of Linear Thermal Expansion | 40 *10-6/K |
| Specific Heat Capacity | 0.9 J/(g*K) |
| Thermal Conductivity | 0.23 W/(m*K) |
| Density | 1.7 g/cm³ |
| Morphology | Semi-crystalline polymer |
| General properties | High toughness. High abrasion and dielectric resistance. Weather-resistant. High light and UV transmission (films). Higher resistance to beta and gamma radiation than PTFE |
| Processing | Injection molding, extrusion |
| Applications | Electronics sector (coil formers, base, switches, cable insulation…). Architecture (films). Material for valves, fittings, hoses. Aerospace. Nuclear Industry |
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 11.12 mg |
| Isothermal Phase | 10 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (40 ml/min) |
Evaluation
The 1st heating (blue) shows a RelaxationWhen a constant strain is applied to a rubber compound, the force necessary to maintain that strain is not constant but decreases with time; this behavior is known as stress relaxation. The process responsible for stress relaxation can be physical or chemical, and under normal conditions, both will occur at the same time. relaxation peak that obscures the glass transition and a melting peak with a shoulder (peak temperature 258°C). The glass transition with a midpoint temperature of 80°C is clearer in the 2nd heating (red). The shoulder is gone from the melting transition which peaks at 259°C.