🧩 PBT+PET+GF30 – PBT + PET 30% Glass Fiber
(High-performance technical material obtained by combining PBT and PET, reinforced with 30% glass fiber. This composite offers high mechanical strength, excellent dimensional stability, and superior thermal durability.)
🔹 What is PBT+PET+GF30
PBT+PET+GF30 combines the advantages of both polyesters:
- PBT – easy to process, impact resistant, and low moisture absorption.
- PET – tough, dimensionally stable, and highly resistant to abrasion.Together, they form a material with a balance of rigidity and toughness, reinforced with glass fiber for high mechanical requirement applications.
🔧 Composition
| Component | Typical Proportion | Role |
| PBT | 40–45 % | Dimensional stability, ease of injection |
| PET | 25–30 % | Rigidity and wear resistance |
| Glass Fiber (GF30) | 30 % | Increases mechanical and thermal strength |
| Additives | < 5 % | Thermal protection, shrinkage reduction |
🚗 Where it is used in the automotive industry
| Component | Example parts | Observations |
| Sensor Housings | Bosch, Siemens, Delphi units | Stability at 140–160 °C |
| Engine Bay Parts | EGR systems, brackets | Excellent chemical resistance |
| Rigid Interior | Guides, fasteners, rigid caps | Rigid, dense, matte finish |
| Precision Parts | Parts with metal inserts | Low shrinkage, geometric stability |
🔩 What to Weld with (Material Compatibility)
- PBT, PET, PBT-GF, PC+PBT ✅ — Weldable (heat plate, ultrasonic).
- PBT+ASA, Xenoy®, Valox® ⚠️ — Partially compatible (thermal control required).
- PBT+PET-GF20 / GF40 ⚠️ — Possible with similar temperatures.
- PP, PE, PA, PVC, ABS ❌ — Chemically and thermally incompatible.
🏭 Manufacturers and Trade Names
- DuPont: Crastin® PBT/PET GF30
- BASF: Ultradur® B+PET GF30
- Celanese: Celanex® PET/PBT GF30
- SABIC: Valox® PBT/PET GF30
🧠 How to Identify
- Marking:
>PBT+PET+GF30<,>PBT/PET-GF30<,>Crastin-GF30<. - Texture: Dense, rigid, slightly glossy, with visible fibers.
- Density: ~1.45–1.52 g/cm³
- ReplastMD practical test: Self-extinguishing flame, faint ester smell, white-grey ash. Very rigid and heat resistant — snaps without elastic deformation.
🛠️ Welding at ReplastMD:
- Heat Plate (Mirror): 250 – 270 °C (Recommended – precise thermal control).
- Ultrasonic / Vibration: ✅ Ideal (Ensures a solid and clean joint).
💡 ReplastMD Recommendation: Use PBT/PET rods or PBT+GF rods, with constant air and low pressure. Avoid overheating — PET becomes brittle under excessive melting.