Ethylenetetrafluoroethylene - ETFE

General Description

A semi-crystalline and expensive melt processable thermoplastic that is essentially a 1:1 alternating copolymer of ethylene and tetrafluorethylene. Even at low temperatures, it has high impact strength and is fairly stiff by fluoropolymer standards.

However, its chemical resistance, although good, is not as good as that of PTFE.

It is used for wire coatings, vessel linings¸ process equipment, and chemical apparatus.

Polymer Type

Thermoplastic

Advantages

Advantages of Ethylenetetrafluoroethylene include:

  • Very high impact strength.
  • Irradiation cross-linkable.
  • May be glass reinforced, which allows for high stiffness for a fluoropolymer.

Disadvantages

Ethylenetetrafluoroethylene can be expensive and is the lowest oxygen index of all the fluoroplastics. Chemical resistance inferior to PTFE, particularly ketones and halogenated hydrocarbons.  

Applications

Applications include, linings, chemical apparatus, wire coatings, components for pumps, valves, tower packing.

Typical Properties

Property Value
Density (g/cm3) 1.7
Surface Hardness RR50
Tensile Strength (MPa) 28
Flexural Modulus (GPa) 1.4
Notched Izod (kJ/m) 1.06+
Linear Expansion (/°C x 10-5) 16
Elongation at Break (%) 150
Strain at Yield (%) 15
Max. Operating Temp. (°C) 160
Water Absorption (%) 0.01
Oxygen Index (%) 31
Flammability UL94 V0
Volume Resistivity (log ohm.cm) 16
Dielectric Strength (MV/m) 25
Dissipation Factor 1 kHz 0.0008
Dielectric Constant 1 kHz 2.6
HDT @ 0.45 MPa (°C) 105
HDT @ 1.80 MPa (°C) 71
Material. Drying hrs @ (°C) NA
Melting Temp. Range (°C) 310 - 350
Mould Shrinkage (%) 3
Mould Temp. Range (°C) 50 - 200

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

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