ETFE

Ethylene and TFE

ETFE is a partially fluorinated copolymer of ethylene and TFE. As a result it is significantly tougher than the traditional fluoropolymers FEP and PFA. This makes it eminently suitable for use in architectural structures. The superior transmission of UV and long wave radiation also leads to it being used extensively in outdoor constructions having been used in such structures as the Allianz Stadium in Munich, the Eden Project in the UK and the Beijing Olympic Swimming Sadium. As a tube it is very much more flexible than FEP and PFA. An ETFE tube will not develop kinks like FEP. ETFE is also suitable for pump impellers or moving parts of equipment that are operating in chemically aggressive environments.

  • Excellent resilience (able to bear 400 times its own weight)
  • Exceptional UV transmission.
  • Operating temperature up to 150°C
  • Wide ranging resistance to chemicals
  • Resistant to high energy radiation
  • Lightweight

Trade Names for ETFE resins include DuPont Tefzel™, Asahi Glass Fluon™

PropertyValueUnitsMethod
Mechanical Properties
Tensile Strength, 23°C5500-7000
38-48
psi
MPa
D 638
Elongation at break, 23°C100-350%D 638 ??
Impact Strength, Izod, 23°CNo breakJ/mD 256
Compressive Stress at 1% deformation1500
10.3
psi
MPa
D 695
Yield Strength At 23°C2800
19
psi
MPa
Density1.7gm/cu.cm
Coefficient of friction0.4D 1894
Thermal Properties
Coefficient of Linear Expansion9 x 10-5K-1
Melting Point225-270°C
Thermal Conductivity0.137
0.238
Btu/hr-.ft-°F
watt/meter-K
ASTM C
177
Specific Heat0.45–0.481.9–2.0Btu/lb/°F
kJ/Kg/deg K
Heat Distortion Temperature
66 lb/sq.in (0.455 MPa)
104°CD 648
Service Temperature-100-150°C
Processing Temperature325-345°C
Electrical Properties
Dielectric Strength, short time, 0.080″
Surface Arc-Resistance75-110secD 495
Volume Resistivity>1016ohm-cmD 257
Surface Resistivity, @ 100% RH>1014Ohm sq-1D 257
Dielectric Constant, 60 Hz to 1 MHz2.5eD150-81
Dielectric Strength59 at 0.25mm
thick
kV mm-1
Dissipation Factor, @ 1 kHz0.0008D150-81
Other Properties
Refractive IndexnD25D 542
Water Absorption<0.02% increase in weightD570-81
Flame Rating+VE-0UL-94
Limiting Oxygen Index30% OxygenD 2863
Resistance to WeatheringExcellent
Water Vapor Transmission rate752Ng cm m-2 s-1E 96

+ Numerical rating for flame spread is not intended to reflect hazards presented by this or any other material under actual fire conditions

Case Study

Ryewater Nurseries

The Nurseries were seeking a new environment in which to cultivate authentic Thai vegetables in the UK specifically to service exclusive Thai restaurants...

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