🧩 ETFE+PA – Coextruded Fluoroplastic with Polyamide
(High-performance multilayer material obtained by coextruding ETFE fluoropolymer with a Polyamide (PA) layer. This combination provides excellent chemical resistance, thermal durability, and an exceptional barrier against fuel and gas diffusion.)
🔹 What is ETFE+PA
ETFE+PA is a sophisticated hybrid used in modern automotive systems. At ReplastMD, we treat it as a high-tech “shielded conduit.” The internal ETFE layer provides a non-stick, chemically inert surface resistant to E10/E85 fuels and biodiesel. The external PA layer (usually PA12 or PA11) ensures mechanical impact resistance and flexibility. It is the preferred material for fuel lines in Hybrid/EV systems and LPG/CNG applications.
🔧 Composition & Structure
- Inner Layer (ETFE): Fluoropolymer for total chemical and vapor barrier.
- Outer Layer (PA): Polyamide (PA12 / PA612) for UV and impact protection.
- Interlayer: Special fluor-amidic adhesive bonding the two layers.
- Density: ~1.35–1.50 g/cm³.
🚗 Where it is used in the automotive industry
| Component | Example parts | Observations |
| Fuel / Ethanol Lines | VW, Toyota, Ford | Perfect vapor and aggressive fluid barrier |
| Venting / EGR Lines | Renault, Peugeot | Pressure and hydrocarbon resistance |
| LPG / CNG Systems | Opel, Dacia | High temperature and sealing stability |
| EV Cooling Lines | BMW, Hyundai | Electrical insulation, non-stick interior |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | ✅ 250 – 270 °C | Only the outer PA layer is welded |
| Heat Plate (Mirror) | ⚠️ Fine Control | Avoid overheating; ETFE degrades > 300 °C |
| PA12 Welding Rod | ✅ Recommended | Rod must match the outer PA layer |
| Ultrasonic | ⚠️ Limited | Only affects the PA layer, not the ETFE |
💡 ReplastMD Recommendation: Weld only the outer PA layer at ~260 °C using a PA12 or PA612 rod. The inner ETFE core does not melt at this temperature, so it must be protected to maintain the chemical barrier integrity.