🧩 TPE-U – Polyurethane Copolymer (TPU)
(Polyurethane-type thermoplastic elastomer derived from segmented polyester or polyether copolymers. Known as TPU, it combines rubber-like elasticity with outstanding mechanical and chemical resistance.)
🔹 What is TPE-U
TPE-U (Thermoplastic Polyurethane) is a block copolymer consisting of hard (urethane) and soft (ether or ester) segments. It offers a unique combination of elasticity, durability, and abrasion resistance, remaining flexible even at low temperatures down to -40 °C. At ReplastMD, we consider TPU one of the most versatile materials for flexible automotive components subject to high mechanical stress.
🔧 Composition & Properties
- Base: Thermoplastic polyurethane copolymer.
- Density: 1.1 – 1.25 g/cm³.
- Melting Point: 170 – 220 °C.
- Continuous Operating Temp: –40 °C → +110 °C.
- Chemical Resistance: Excellent (oils, fuels, solvents).
🚗 Where TPE-U is used in the automotive industry
| Component | Example parts | Observations |
| Flexible Hoses | Fuel, air, and cooling lines | High chemical and mechanical resistance |
| Gaskets & Seals | Covers, connectors, valves | Elastic seal, oil resistant |
| Anti-vibration | Bushings, dampers, mounts | Elasticity + fatigue resistance |
| Protection | Sensor housings, boots, plugs | Flexibility and UV stability |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | 240 – 260 °C | Elastic, clean joint; bubble-free |
| Heat Plate (Mirror) | 230 – 250 °C | Precise weld without degradation |
| Manual Extrusion | 240 – 260 °C | Compatible TPU / TPE-U rod |
| Ultrasonic | — | Possible for thin-walled parts |
🔩 Material Compatibility
- ✅ Compatible: TPE-U (same type), TPE-E, TPE-A, TPE.
- ⚠️ Partial: PU (Cast Polyurethane).
- ❌ Incompatible: PP, PE, ABS, PVC, PA, PC, POM, PET (different polarities).
💡 ReplastMD Recommendation: Weld TPE-U with hot air at 250 °C using a compatible TPU rod, moderate pressure, and slow cooling. Avoid overheating, as the material will turn yellow-transparent and become overly stretchable.
🧠 How to Identify TPE-U
- Elastic texture, often clear or translucent.
- Slightly rubbery, glossy surface.
- ReplastMD practical test: Melts uniformly at 200–230 °C without heavy smoke, releasing a faint sweet polyurethane scent.
- Common markings: >TPU<, >TPE-U<, >ELASTOLLAN<, >DESMOPAN<.
🛠️ TPE-U Welding at ReplastMD:
At our ReplastMD service center (Chisinau, Ciocana sector), we provide professional TPU/TPE-U welding using industrial Leister equipment. We ensure an elastic, airtight, and oil-resistant finish — plastic as good as new.