ETFE Properties - Fluorotherm™

Materials Overview

ETFE Properties

ETFE is distinguished from perfluopolymers (totally fluorinated polymers) as a partially fluorinated copolymer of ethylene and TFE. This chemical modification provides significantly higher strength relative to PTFE, FEP or PFA. It is less flexible than PTFE, but has superior impact strength, abrasion and cut through resistance. Addition of a third component to the chemical structure creates a modified ETFE that has lower weight per unit volume, is stiffer and tougher than PTFE, PFA or FEP. These properties allow it to withstand greater physical abuse during its lifetime. For example, glass reinforced ETFE has outstanding wear characteristics and may be used for bearing applications. ETFE is also suitable for pump impellers or moving parts of equipment that are operating in chemically aggressive environments (check to ensure chemical compatibility).

ETFE – Ethylene tetrafluoro ethylene - TYPICAL PROPERTIES
Tensile Strength, 73°F5500 - 7000
38 - 48
D 638
Elongation at break, 73°F100 - 350%D 638 ??
Flexural Strength, 73°FD 790
Impact Strength, Izod, 23 deg CNo breakJ/mD 256
Compressive Stress at 1% deformation,1500
D 695
Yield Strength
At 23 deg C
Coefficient of friction0.4D 1894
Coefficient of Linear Expansion9 x 10-5K-1
Melting Point437 - 518
225 - 270
deg F
deg C
Thermal Conductivity0.137
ASTM C 177
Specific Heat0.45 – 0.48
1.9 – 2.0
Btu/lb/deg F
kJ/Kg/deg K
Heat Distortion Temperature, 66 lb/ (0.455 MPa)219
deg F
deg C
D 648
Service Temperature<-148 to 302
<-100 to 150
deg F
deg C
Processing Temperature617 - 653
325 - 345
deg F
deg C
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 0.25 mm thickkV mm-1
Dissipation Factor, @ 1 kHz0.0008D150-81
Refractive IndexnD 25D 542
Water Absorption<0.02% increase in weightD570-81
Flame Rating+VE-0UL-94
Limiting Oxygen Index30% OxygenD 2863
Resistance to WeatheringExcellent
Specific GravityD792-66 (1979)
CO2 Permeability113(M3 (STP) m s-1 m-2 Pa 1) x 105D 1434
O2 Permeability45(M3 (STP) m s-1 m-2 Pa 1) x 105D 1434
N2 Permeability14(M3 (STP) m s-1 m-2 Pa 1) x 105D 1434
Helium Permeability405(M3 (STP) m s-1 m-2 Pa 1) x 105D 1434
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
ETFE can be cross-linked by ionizing radiation.

NOTE: The information, recommendations and opinions contained herein is only a guide and is intended solely for your consideration, inquiry and verification. The suitability of any material under specific conditions of application is not guaranteed in any manner. Fluorotherm™ Polymers Inc does not assume legal responsibility for the use of data presented here in any form, under any circumstances, any application, test or communication. Nothing contained herein is to be interpreted as a license or authorization to operate under or infringe any patent.