ETFE High-Flex-Life Grade Properties — Complete Engineering Data Sheet (2026)
Tensile data verified against MatWeb.com database & manufacturer datasheets · Last updated July 2026
Published: 2026-06-08
ETFE (ethylene tetrafluoroethylene) occupies a specific niche in the fluoropolymer family: it is tougher and more flexible than PTFE, more abrasion-resistant than FEP, and processable by conventional extrusion — making it the dominant insulation...
ETFE (ethylene tetrafluoroethylene) occupies a specific niche in the fluoropolymer family: it is tougher and more flexible than PTFE, more abrasion-resistant than FEP, and processable by conventional extrusion — making it the dominant insulation material for aerospace wire and cable. ETFE's key advantage is flex life: thin-wall ETFE insulation on stranded copper wire survives 10-20× more flex cycles than PTFE insulation of the same thickness. This makes it the standard for: aircraft wiring harnesses (Boeing, Airbus), robotic arm cable carriers (repetitive flexing in automation), downhole oil & gas instrumentation wire (combined chemical + thermal + mechanical demands), and nuclear plant control cabling (radiation resistance).
ETFE is also notable for its use in architectural membranes — the Eden Project biomes and the Beijing National Aquatics Center ('Water Cube') use ETFE foil cushions for lightweight, UV-transparent roofs. This application is unrelated to wire insulation but demonstrates ETFE's unique combination of mechanical toughness, chemical resistance, and UV transparency unmatched by any other fluoropolymer.
Recommended Applications
ETFE High-Flex-Life Grade is commonly specified for:
⚠ Not Recommended For
ETFE High-Flex-Life Grade is not recommended for:
- Applications requiring ultra-low friction coefficient (ETFE friction ~0.4 vs PTFE ~0.05; use PTFE for bearings)
- Continuous service above 150°C (use PFA or PEEK for higher temperature)
- Strong polar solvent exposure at elevated temperature (use PTFE or PFA for aggressive chemical environments)
Selection & Application Guide
ETFE (Tefzel) is the high-strength fluoropolymer choice for wire and cable insulation, architectural membranes, and chemical lining applications where PTFE's mechanical weakness is a problem. Choose ETFE over PTFE when tensile strength (45 MPa vs 25 MPa) and abrasion resistance are needed; over PFA when lower cost and higher mechanical toughness matter and the 150°C service temperature is sufficient. ETFE is also the most radiation-resistant fluoropolymer.
Real-World Applications
ETFE's combination of electrical properties, flame resistance (limiting oxygen index 31%), and mechanical toughness makes it standard for MIL-W-22759 aircraft wiring.
ETFE film is used for iconic building facades (Beijing Water Cube, Eden Project) providing 95% light transmission, self-cleaning, and 30+ year weathering resistance.
ETFE film provides UV-resistant, high-transmission front sheets for flexible and building-integrated photovoltaic modules.
ETFE lining provides chemical resistance similar to PTFE with better mechanical strength and weldability for tank and vessel lining in chemical processing.
Processing & Cost Considerations
Manufacturing Tips
- ETFE processes at 270-310°C melt temperature with mold temperatures of 80-120°C — lower than PFA and achievable on standard high-temperature injection molding machines.
- ETFE can be extruded into film (down to 12μm thickness), wire coating, and tubing. It has a relatively narrow processing window compared to commodity plastics — precise temperature control is important.
- ETFE is the most radiation-resistant fluoropolymer, maintaining properties after gamma and electron-beam sterilization. This makes it suitable for nuclear and space applications where other fluoropolymers degrade.
ETFE costs $30-60/kg — more than commodity plastics but less than PFA ($50-100/kg) and much less than PEEK. For wire insulation, ETFE provides the best balance of performance and cost among fluoropolymers. ETFE architectural film is expensive per square meter but offers 30+ year service life with minimal maintenance, reducing total lifecycle cost compared to glass or metal facades.
Technical Properties
| Density | 1.70 g/cm³ |
|---|---|
| Tensile Strength | 45 MPa |
| Melting Point | 260 °C |
| Shrinkage Rate | 2.0-3.0% |
| Flexural Modulus | 1.4 GPa |
| Hdt | 105 °C at 1.82 MPa |
Engineering Tool: Shrinkage & Cost Estimator
Calculate part weight, mold cavity dimensions accounting for shrinkage, and material cost — all locally in your browser.
Equivalents & Cross-References
| Equivalent / Alternate | Action |
|---|---|
| Tefzel ETFE | |
| Neoflon ETFE |
Frequently Asked Questions
ETFE vs PTFE for wire insulation — which is better?
ETFE for applications requiring flex life (moving cables, vibration environments), abrasion resistance, or radiation resistance. PTFE for applications requiring the absolute highest temperature rating (260°C vs ETFE's 150°C continuous) or the lowest dielectric constant. ETFE is also significantly easier to strip (mechanically remove insulation from wire ends) than PTFE — a practical consideration in high-volume wire harness manufacturing.
Can ETFE be crosslinked for higher temperature performance?
Yes — crosslinked ETFE (XL-ETFE) raises the continuous service temperature from 150°C to approximately 200°C. The crosslinking is achieved through electron beam irradiation after extrusion. XL-ETFE is specified for aerospace applications where the wire may see brief temperature excursions above ETFE's normal rating. The trade-off is that XL-ETFE cannot be recycled or thermoformed after crosslinking.
How does ETFE compare to PTFE for wire insulation?
ETFE has 2× higher tensile strength (45 MPa vs 25 MPa), better abrasion resistance, and can be extruded as wire insulation (PTFE requires paste extrusion and sintering). PTFE offers better chemical resistance and higher temperature rating (260°C vs 150°C for ETFE). For aerospace wiring below 150°C, ETFE is standard; for extreme temperature or chemical environments, PTFE is specified.
Can ETFE be welded?
Yes. ETFE can be heat-welded, extrusion-welded, and impulse-welded — a significant advantage over PTFE which cannot be welded. This makes ETFE ideal for tank lining systems and architectural membrane seams where weldable joints are required.
Is ETFE suitable for outdoor applications?
Yes. ETFE has outstanding UV and weather resistance with minimal property degradation over 30+ years of outdoor exposure. It does not yellow or become brittle like many transparent polymers. ETFE film maintains >90% light transmission after decades of outdoor service.
What is the difference between ETFE and FEP?
ETFE has higher mechanical strength (45 MPa vs 30 MPa tensile), better abrasion resistance, and better radiation resistance. FEP has better chemical resistance (fully fluorinated), lower coefficient of friction, and higher maximum service temperature (200°C vs 150°C). Choose ETFE for mechanical/wear applications; FEP for chemical/temperature applications.
Is ETFE recyclable?
Yes. ETFE is thermoplastic and can be melted and reprocessed multiple times without significant property degradation. This is an environmental advantage over thermoset materials. ETFE architectural membranes can be recycled at end of life, contributing to sustainable building certifications.
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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