🧩 TPA (TPE-A) – Thermoplastic Polyamide Elastomer
(A high-performance polyamide-polyester block copolymer combining the chemical and mechanical strength of PA (nylon) with the elasticity of thermoplastic rubber. A premium material for flexible parts operating between –40 °C and +150 °C.)
🔹 What is TPA (TPE-A)
TPA is a “technical-grade” elastomer, often known by the trade name Pebax®. At ReplastMD, we treat it as a high-precision polymer. Its structure consists of rigid polyamide segments and flexible polyether segments, providing an exceptional balance between fatigue resistance and thermal stability. It is vastly superior to standard TPEs in terms of durability and consistent performance over time, especially in contact with automotive fluids.
🔧 Composition & Properties
- Polymer Base: Polyamide (PA6, PA12, PA610) ~60%.
- Elastic Phase: Flexible polyether/polyester ~40%.
- Density: ~ 1.03 – 1.15 g/cm³.
- Operating Range: Constant use up to +150 °C.
- Visuals: Elastic, smooth, slightly rubbery; black, grey, or translucent milky white.
🚗 Where it is used in the automotive industry
| Component | Example parts | Observations |
| Bellows & Oil Hoses | VW, Renault, Ford | Elasticity + resistance to automotive fluids |
| Connector Sleeves | BMW, Toyota, Peugeot | Pressure and temperature resistance |
| Dynamic Parts | Mercedes, Dacia | Long-lasting elasticity without cracking |
| Soft Overmolding | Hyundai, Kia | Excellent compatibility with PA6/PA12 substrates |
🔧 Welding and Bonding Methods
| Method | Optimal Temp | Observations |
| Hot Air | 250 – 270 °C | Clean welding without carbonization |
| Heat Plate (Mirror) | ✅ Recommended | Very strong, uniform bonding |
| Ultrasonic | ✅ Ideal | Excellent for thin-walled bellows and hoses |
💡 ReplastMD Recommendation: Weld at ~260 °C using digital temperature control or teflon-coated heating plates. TPA (TPE-A) is the ideal material for high-precision flexible parts exposed to oil, heat, and pressure, offering long-term durability and elasticity.