ETFE: Ethylene-tetrafluoroethylene

General Properties

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ETFE

Ethylene-tetrafluoroethylene


Ethylene tetrafluoroethylene (ETFE) is a semi-crystalline PTFE derivate, but features a lower temperature stability.

Structural Formula


Properties

Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.Glass Transition Temperature75 to 85°C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Temperature225 to 275°C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Enthalpy46 J/g
Decomposition Temperature385 to 400°C
Young's Modulus1100 MPa
Coefficient of Linear Thermal Expansion40 *10-6/K
Specific Heat Capacity0.9 J/(g*K)
Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.Thermal Conductivity0.23 W/(m*K)
Density1.7 g/cm³
MorphologySemi-crystalline polymer
General propertiesHigh toughness. High abrasion and dielectric resistance. Weather-resistant. High light and UV transmission (films). Higher resistance to beta and gamma radiation than PTFE
ProcessingInjection molding, extrusion
ApplicationsElectronics sector (coil formers, base, switches, cable insulation…). Architecture (films). Material for valves, fittings, hoses. Aerospace. Nuclear Industry

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass11.12 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase10 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)