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Ethylene-Tetrafluoroethylene Copolymer ( ETFE )

Material Information

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Film Mesh Rod
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Common Brand Names:
Tefzel, Hostaflon ET
 
General Description:  

An expensive, semi-crystalline, melt processable thermoplastic that is essentially a 1:1 alternating copolymer of ethylene and tetrafluorethylene. It has a very high impact strength even at low temperatures and is relatively stiff by fluoropolymer standards, but its chemical resistance, though good, is not as good as that of PTFE.

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

   

Chemical Resistance

Acids - concentrated Good
Acids - dilute Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Good
Greases and Oils Good
Halogenated Hydrocarbons Good
Halogens Good
Ketones Good

Electrical Properties

Dielectric constant @1MHz 2.6
Dielectric strength ( kV mm-1 ) 25
Dissipation factor @ 1MHz 0.0005
Surface resistivity ( Ohm/sq ) >1014
Volume resistivity ( Ohmcm ) 1016

Mechanical Properties

Elongation at break ( % ) 250-350
Hardness - Rockwell R50
Izod impact strength ( J m-1 ) >1000
Tensile modulus ( GPa ) 0.8
Tensile strength ( MPa ) 28-48

Physical Properties

Density ( g cm-3 ) 1.7
Flammability V0
Limiting oxygen index ( % ) 30-32
Radiation resistance Fair
Refractive index 1.403
Resistance to Ultra-violet Excellent
Water absorption ( % ) 0-0.03

Thermal Properties

Coefficient of thermal expansion ( x10-6 K-1 ) 90-170
Heat-deflection temperature - 0.45MPa ( C ) 105
Heat-deflection temperature - 1.8MPa ( C ) 70
Lower working temperature ( C ) <-100
Specific heat ( J K-1 kg-1 ) 1900-2000
Thermal conductivity @23C ( W m-1 K-1 ) 0.24
Upper working temperature ( C ) 150-160

Properties for Ethylene-Tetrafluoroethylene Copolymer Film

Property Value
Permeability to Carbon Dioxide @25C x10-13 cm3. cm cm-2 s-1 Pa-1 3
Permeability to Nitrogen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.2
Permeability to Oxygen @25C x10-13 cm3. cm cm-2 s-1 Pa-1 0.6
Permeability to Water @38C x10-13 cm3. cm cm-2 s-1 Pa-1 170
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Buy Ethylene-Tetrafluoroethylene Copolymer on-line

Standard products are available in these forms
Film Mesh Rod
Film Mesh Rod

Choose a form to search our on-line catalog  

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