🧩 PBS – Polybutylene Succinate
(Biodegradable, thermoplastic, and durable material obtained by condensing bio-succinic acid with 1,4-butanediol. PBS offers mechanical strength close to polypropylene (PP) but is fully biodegradable and compatible with other biopolymers.)
🔹 What is PBS
PBS (Polybutylene Succinate) is a semi-crystalline aliphatic polyester from the bioplastic family. At ReplastMD, we treat PBS as a high-performance bio-base. It features moderate rigidity, stable thermal resistance, and excellent processability. It is frequently used in blends to improve the flexibility of other bio-resins while maintaining structural integrity for functional automotive components.
🔧 Composition & Properties
- Polymer Base: Aliphatic Polyester (PBS).
- Monomers: Succinic acid + 1,4-butanediol.
- Density: 1.25 – 1.27 g/cm³.
- Melting Point: 113 – 120 °C.
- Operating Range: –30 °C to +90 °C.
- Chemical Resistance: Good (oils, greases, cold water).
🚗 Where PBS is used in the automotive industry
| Component | Example parts | Observations |
| Bio Gaskets & Caps | Interior, trunk, protectors | Durable, glossy, odorless |
| Finishing Elements | Panels, plates, sensor covers | Ecological alternative to PP |
| Bio Films & Layers | Interior protection, decorative layers | Flexible and thermally stable |
| Bio Prototypes | Functional demonstration parts | Rigid, injectable, compostable |
🔧 Welding Temperature and Methods
| Method | Optimal Temp | Observations |
| Hot Air | ✅ 120 – 130 °C | Weldable, clear melt, smoke-free |
| Heat Plate (Mirror) | ✅ 120 – 130 °C | Clean, smooth bonding |
| Manual Extrusion | ⚠️ 130 – 140 °C | Possible with fine control |
| Chemical Bonding | ✅ Recommended | Bio-compatible polyester adhesives |
💡 ReplastMD Recommendation: PBS welds very well at 120 °C, providing a glossy and uniform joint. For thicker parts, light pressure and slow cooling are advised to prevent internal stress and warping.