🧩 PBT+BIO – Bio-based Polybutylene Terephthalate
(A next-generation eco-friendly material, partially produced from renewable resources, maintaining the same mechanical and thermal properties as classic PBT. Used in ecological automotive parts to reduce the carbon footprint.)
🔹 What is PBT+BIO
PBT+BIO is a modern version of Polybutylene Terephthalate where petrochemical components are partially replaced by plant-derived monomers (such as bio-butanediol obtained from sugars). The resulting material offers identical mechanical, thermal, and chemical resistance as standard PBT, but with reduced CO₂ emissions. It is fully recyclable and compatible with standard PBT, making it ideal for eco-friendly OEM parts.
🔧 Composition & Properties
- Base: 70–90% PBT, 10–30% Bio-based components.
- Density: 1.30–1.40 g/cm³.
- Melting Point: ≈ 220–225 °C.
- Chemical Resistance: Excellent (oils, fuels, solvents).
- Continuous Heat Resistance: 120–140 °C.
🚗 Where PBT+BIO is used in the automotive industry
| Component | Example parts | Observations |
| Eco OEM Parts | Covers, frames, sensor housings | Equal performance to standard PBT |
| Technical Interior | Panels, covers, mounts | Glossy finish, rigid, recyclable |
| Electrical Systems | Connectors, housings, guides | Thermal stability and good insulation |
| Engine Bay | Clips, brackets, covers | High chemical resistance |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | 250 – 270 °C | Uniform melting, no excessive smoke |
| Plastic Extrusion | 240 – 260 °C | Suitable for rigid technical parts |
| Heat Plate (Mirror) | 240 – 260 °C | Clean and stable bonding |
🔩 Material Compatibility
- ✅ Compatible: PBT, PBT+GF, PBT+PC, PBT+PET, PBT+ASA, PC+PBT.
- ⚠️ Good Compatibility: PBT+PA, POM+PBT.
- ❌ Incompatible: PP, PE, ABS, PVC (completely different melting points).
💡 ReplastMD Recommendation: Use standard PBT rods at 260 °C. The material behaves similarly to normal PBT but requires slightly slower heating to prevent natural yellowing.
🧠 How to Identify PBT+BIO
- Engraved marking: >PBT+BIO<, >ULTRADUR BIO<, >VALOX ECO<, >CRASTIN BIO<.
- Texture: Glossy, slightly pearlescent surface.
- ReplastMD practical test: Burns with a yellow-blue flame and a faint vegetable ester scent. Softens at ≈ 220 °C.
🛠️ PBT+BIO Welding at ReplastMD:
At our ReplastMD service center (Chisinau, Ciocana sector), we perform professional PBT+BIO welding for eco-friendly housings and OEM components, ensuring a clean, high-strength, and sustainable finish.