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
| Property | Value | Units | Method |
| MECHANICAL PROPERTIES | |||
| Tensile Strength, 73°F | 5500 - 7000 38 - 48 | psi MPa | D 638 |
| Elongation at break, 73°F | 100 - 350 | % | D 638 ?? |
| Flexural Strength, 73°F | D 790 | ||
| Impact Strength, Izod, 23 deg C | No break | J/m | D 256 |
| Compressive Stress at 1% deformation, | 1500 10.3 | psi MPa | D 695 |
| Yield Strength At 23 deg C | 2800 19 | psi MPa | |
| Density | 1.7 | gm/cu.cm | |
| Coefficient of friction | 0.4 | D 1894 | |
| THERMAL PROPERTIES | |||
| Coefficient of Linear Expansion | 9 x 10-5 | K-1 | |
| Melting Point | 437 - 518 225 - 270 | deg F deg C | |
| Thermal Conductivity | 0.137 0.238 | Btu·in/h·ft2·°F W/m·K | ASTM C 177 |
| Specific Heat | 0.45 – 0.48 1.9 – 2.0 | Btu/lb/deg F kJ/Kg/deg K | |
| Heat Distortion Temperature, 66 lb/sq.in (0.455 MPa) | 219 104 | deg F deg C | D 648 |
| Service Temperature | <-148 to 302 <-100 to 150 | deg F deg C | |
| Processing Temperature | 617 - 653 325 - 345 | deg F deg C | |
| ELECTRICAL PROPERTIES | |||
| Dielectric Strength, short time, 0.080” | |||
| Surface Arc-Resistance | 75 - 110 | sec | D 495 |
| Volume Resistivity | > 1016 | ohm-cm | D 257 |
| Surface Resistivity, @ 100% RH | > 1014 | Ohm sq-1 | D 257 |
| Dielectric Constant, 60 Hz to 1 MHz | 2.5 | e | D150-81 |
| Dielectric Strength | 59 at 0.25 mm thick | kV mm-1 | |
| Dissipation Factor, @ 1 kHz | 0.0008 | D150-81 | |
| OTHER PROPERTIES | |||
| Refractive Index | nD 25 | D 542 | |
| Water Absorption | <0.02 | % increase in weight | D570-81 |
| Flame Rating+ | VE-0 | UL-94 | |
| Limiting Oxygen Index | 30 | % Oxygen | D 2863 |
| Resistance to Weathering | Excellent | ||
| Specific Gravity | D792-66 (1979) | ||
| CO2 Permeability | 113 | (M3 (STP) m s-1 m-2 Pa 1) x 105 | D 1434 |
| O2 Permeability | 45 | (M3 (STP) m s-1 m-2 Pa 1) x 105 | D 1434 |
| N2 Permeability | 14 | (M3 (STP) m s-1 m-2 Pa 1) x 105 | D 1434 |
| Helium Permeability | 405 | (M3 (STP) m s-1 m-2 Pa 1) x 105 | D 1434 |
| Water Vapor Transmission rate | 752 | Ng cm m-2 s-1 | E 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.
