🧩 PEI+PC – Polyetherimide + Polycarbonate
(High-performance technical plastic, weldable, rigid, and heat-resistant. Used in sensor housings, connectors, and automotive structural components.)
🔹 What is PEI+PC
PEI+PC is a high-performance hybrid blend designed for applications requiring a balance of rigidity, thermal stability, and impact strength. PEI contributes rigidity and chemical resistance, while PC ensures toughness and better processability. The result is a dimensionally stable material with minimal shrinkage, excellent resistance to temperatures over 200°C, and predictable behavior in structural or electrical applications.
🔧 Composition & Properties
- Composition: 60–70% Polyetherimide (PEI), 30–40% Polycarbonate (PC).
- Density: 1.30–1.40 g/cm³.
- Vicat Softening Temperature: ≈ 200–210 °C.
- Chemical Resistance: Excellent (oils, solvents, fuels).
- Continuous Heat Resistance: 190–210 °C.
🚗 Where PEI+PC is used in the automotive industry
| Component | Example parts | Observations |
| Electrical / Sensors | Sensor covers, ECU, connectors | Excellent insulation and high rigidity |
| Engine / Thermal | Pump covers, valves, mounts | Thermal stability over 200 °C |
| Technical Structures | Clips, housings, fasteners | Rigid, dense, low deformation |
| Interior Parts | Aesthetic covers, OEM parts | Matte finish, thermal shock resistant |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | 340 – 360 °C | Uniform melting, controlled flow |
| Plastic Extrusion | 330 – 350 °C | PEI, PEI+PC, or PPS+PEI rods |
| Heat Plate (Mirror) | 330 – 350 °C | Clean bond, zero oxidation |
🔩 Material Compatibility
- ✅ Compatible: PEI, PEI+GF, PPSU, PSU, PES, PPS+PEI, PEEK.
- ⚠️ Good Compatibility: PC, PC+ABS, PC+PBT, PC+ASA.
- ❌ Incompatible: PP, PE, PS, ABS, PVC, PET (completely different melting points).
💡 ReplastMD Recommendation: Use PEI or PEI+PC rods at 350°C. Heat uniformly to avoid carbonization; slow cooling prevents internal stresses and results in a dense, professional bond.
🧠 How to Identify PEI+PC
- Engraved marking: >PEI+PC<, >ULTEM PC BLEND<, >ULTRASON PC<.
- Texture: Semi-glossy, dense, heavier than standard PC.
- ReplastMD practical test: Rigid, dense, and does not deform under 200°C hot air. Burns with a clean flame and a faint imide scent.
🛠️ PEI+PC Welding at ReplastMD:
At our ReplastMD service center (Chisinau, Ciocana sector), we perform professional PEI+PC welding for sensor housings, ECU units, and high-temp fittings, ensuring a high-strength finish resistant up to 210°C.