🧩 TPE-EA / TPE-EE – Polyester-based Thermoplastic Elastomers
(Part of the TPE-E family, also known as elastomeric copolyesters. These high-performance materials combine the mechanical strength of PBT/PET with the flexibility of rubber, offering durability against heat, oils, and fuels.)
🔹 What are TPE-EA and TPE-EE
At ReplastMD, we categorize these to ensure the best repair strategy:
- TPE-EA (Ester-Ether): Features polyether soft segments. It excels in low-temperature flexibility, making it perfect for cold-weather bellows.
- TPE-EE (Ester-Ester): Features aliphatic polyester soft segments. It is more rigid but offers superior chemical and thermal stability up to 200 °C.Commonly grouped as COPE, these materials are widely known by brands like Hytrel® or Arnitel®.
🔧 Composition & Properties
- Base: Rigid PBT/PET segments + Soft elastic segments.
- Density: ~ 1.18 – 1.30 g/cm³.
- Operating Range: Up to 150 °C (EA) or 200 °C (EE).
- Visuals: Elastic, smooth, semi-glossy; black, grey, or translucent milky white.
🚗 Where it is used in the automotive industry
| Part Type | Application Examples | Observations |
| Bellows & Gaskets | VW, BMW, Toyota | Elasticity and high oil resistance |
| Air / Vacuum Hoses | Renault, Ford | TPE-EE preferred for high-heat zones |
| Anti-vibration / Mounts | Mercedes, Peugeot | Shock absorption and dimensional stability |
| Cable Insulation | Hyundai, Dacia | Resistance to abrasion and friction |
🔧 Welding and Bonding Methods
| Method | Optimal Temp | Observations |
| Hot Air | 250 – 270 °C | Clean weld without carbonization |
| Heat Plate (Mirror) | ✅ Recommended | Uniform bonding without pores |
| Chemical Bonding | ⚠️ Restricted | Requires polyester-specific primers (Loctite® 406 + 770) |
💡 ReplastMD Recommendation: Weld at ~260 °C using digital temperature control or teflon-coated heating plates. Choose TPE-EA for cold flexibility and TPE-EE for chemical and thermal resistance.