ETFE Tefzel vs. PTFE Teflon: Which Fluoropolymer for Aerospace Wire Insulation?
Published: 2026-06-04
ETFE and PTFE are both fully-fluorinated polymers with excellent chemical resistance, but their mechanical properties diverge dramatically. ETFE offers 80% higher tensile strength (45 vs 25 MPa), significantly better abrasion resistance, and can...
ETFE and PTFE are both fully-fluorinated polymers with excellent chemical resistance, but their mechanical properties diverge dramatically. ETFE offers 80% higher tensile strength (45 vs 25 MPa), significantly better abrasion resistance, and can be radiation crosslinked for improved high-temperature creep resistance. These properties make ETFE the standard for aerospace wire insulation (MIL-W-22759) where mechanical durability matters as much as chemical resistance. PTFE's primary advantage is its higher continuous service temperature (260°C vs 150°C) and lower coefficient of friction (0.04 vs 0.4 for ETFE).
Comparison at a Glance
| Material A | ETFE Tefzel (Ethylene Tetrafluoroethylene) |
|---|---|
| Material B | PTFE Teflon (Polytetrafluoroethylene) |
| Polymer Type | Both fluoropolymers |
| Tensile Strength A | 45 MPa |
| Tensile Strength B | 25 MPa |
| Continuous Temp A | 150 °C |
| Continuous Temp B | 260 °C |
| Cost Relative | ETFE 20-30% more expensive than PTFE |
| Best For A | Aerospace wire jacketing, high-strength chemical linings |
| Best For B | High-temperature seals, gaskets, chemical pipe linings |
Frequently Asked Questions
Why is ETFE preferred over PTFE for wire insulation despite PTFE's higher temperature rating?
Wire insulation fails more often from mechanical abrasion (vibration, chafing against structure) than from temperature. ETFE's 2× tensile strength and superior abrasion resistance directly address the primary failure mode. Additionally, PTFE cannot be melt-extruded onto wire — it requires paste extrusion and sintering, a more expensive process than ETFE's conventional melt extrusion. The mechanical and processing advantages of ETFE outweigh PTFE's temperature advantage for all but the highest-temperature (200°C+) wire applications.
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References & Industry Standards
- ASTM International. Standard Specifications for Engineering Plastics & Thermoplastics. astm.org
- UL Prospector. Plastics & Elastomers Material Database. ulprospector.com
- MatWeb. Material Property Data for Engineering Thermoplastics. matweb.com
- ISO 1043. Plastics — Symbols and Abbreviated Terms. iso.org