🧩 PBT/PET – Polyester Copolymer (Polybutylene terephthalate / Polyethylene terephthalate)
(A technical polyester alloy combining PBT and PET, resulting in high rigidity, excellent dimensional stability, and temperature resistance up to 150 °C. Widely used for rigid housings and high-precision electrical insulation.)
🔹 What is PBT/PET
PBT/PET is a balanced technical blend. At ReplastMD, we treat it as a precision engineering material. By mixing PBT (which offers impact resistance) with PET (which provides stiffness and gloss), we achieve a material with lower moisture absorption and superior dimensional stability compared to pure PBT. It is highly valued for automotive connectors and housings due to its resistance to oils, fuels, and solvents.
🔧 Composition & Properties
- Polymer Base: PBT (~50%) + PET (~50%).
- Density: ~ 1.35 – 1.45 g/cm³.
- Operating Range: Constant use up to +150 °C.
- Chemical Resistance: Good (oils, fuels, solvents).
- Visuals: Rigid, smooth, glossy; grey, beige, black, or pearlescent white.
🚗 Where it is used in the automotive industry
| Component | Example parts | Observations |
| Connector Housings | VW, Renault, Toyota | Dimensional stability and electrical insulation |
| EGR / Air Pump Parts | BMW, Ford | Heat and automotive fluid resistance |
| Engine Covers / Mounts | Mercedes, Dacia | Thermal shock and vibration resistance |
| Rigid Trim Elements | Hyundai, Peugeot | Fine surface finish and chemical durability |
🔧 Welding and Bonding Methods
| Method | Optimal Temp | Observations |
| Hot Air | 250 – 270 °C | Clean welding without carbonization |
| Heat Plate (Mirror) | ✅ Recommended | Smooth and uniform weld |
| Chemical Bonding | ⚠️ Limited | Requires polyester-specific adhesives (Loctite® 406 + 770) |
💡 ReplastMD Recommendation: Weld at ~260 °C using digital temperature control or teflon-coated heating plates. PBT/PET is ideal for housings, connectors, and parts exposed to moderate heat, offering high mechanical rigidity and electrical safety.