🧩 PE-HD+GF – Glass Fiber Reinforced High-Density Polyethylene
(Rigid and durable technical plastic, used in automotive parts exposed to intense mechanical stress and vibrations)
🔹 What is PE-HD+GF
PE-HD+GF is high-density polyethylene (PE-HD) reinforced with Glass Fiber (GF), designed to improve mechanical strength, rigidity, and dimensional stability.
By adding glass fibers (5–30%), a much harder and more thermally stable compound is achieved with reduced shrinkage, ideal for technical and structural automotive parts. This material is preferred in areas where simple PE-HD would be too flexible or would deform over time.
🔧 Composition
- High-Density Polyethylene (PE-HD) – thermoplastic base.
- GF (Glass Fiber 10–30%) – structural reinforcement.
- Additives – UV stabilizers, antioxidants, coupling agents.
- Density: 0.97–1.10 g/cm³ (depending on the fiber percentage).
🚗 Where PE-HD+GF is used in the automotive industry
| Component | Example parts | Observations |
| Engine Compartment | Brackets, covers, consoles | High resistance to heat and vibrations |
| Technical Exterior | Bumper mounts, sensor holders | Rigid, no deformations |
| Technical Interior | Thick covers, structural panels | Dimensionally stable |
| Aftermarket | Mechanical components and prototypes | Can replace nylon in some applications |
🔧 Welding Temperature and Methods
| Method | Optimal Temperature | Observations |
| Hot Air | 270 – 290 °C | Possible, but requires strict temperature control |
| Heat Plate (Mirror) | 260 – 280 °C | Ensures a solid bond |
| Manual Extrusion | 250 – 270 °C | Possible, but fiber can affect flow |
🔩 What to Weld PE-HD+GF With (Material Compatibility)
The question “what to weld PE-HD+GF with” is important because glass fiber changes the melting behavior. A successful weld is obtained only with structurally compatible materials (reinforced or simple PE-HD).
✅ Compatible:
- PE-HD+GF ↔ PE-HD+GF – ideal combination.
- PE-HD+GF ↔ PE-HD / PE-MD – partially compatible (lower strength).
- PE-HD+GF ↔ PE-HD+MD20 / PE-HD+CF – good compatibility (thermally similar).
❌ Incompatible:
- PP, ABS, ASA, PC, PA, PVC – different chemistry, uneven melting.
💡 ReplastMD Recommendation:
Use technical PE-HD rod or rods with 20–30% glass fiber content at a temperature of 275–285 °C. Clean the oxidation zone, heat slowly until uniform melting, avoiding burning the fiber. For high thicknesses, double welding with mechanical reinforcement is recommended.
🏭 Manufacturers and Trade Names
- LyondellBasell: Hostalen® GF
- Borealis: Borstar® GF
- SABIC: HDPE-GF Compound
- Röchling: Polystone® GF
🧠 How to Identify PE-HD+GF
- Engraved marking: >PE-HD-GF20<, >PE-GF<, or >HDPE+GF<.
- Matte surface, slightly rough, with visible fiber texture.
- Yellow-blue flame, faint paraffin smell.
- Softens slowly at 280 °C, without bubbles.
- Does not float completely (density over 1 g/cm³).
🛠️ PE-HD+GF Welding at ReplastMD:
At our service center in Chisinau (Ciocana sector), ReplastMD performs professional PE-HD+GF welding and repairs for:
- brackets, covers, consoles, and structural elements;
- repairs of thick tanks and rigid technical parts;
- reinforcements with compatible rods or mechanical inserts;
- durable matte finish with OEM-like strength.