🧩 PC+Makrolon – Makrolon® Polycarbonate (Covestro Blend)
(Premium polycarbonate material produced by Covestro/Bayer, equivalent to SABIC’s Lexan®. It represents one of the most stable, clear, and resistant types of PC in the world – widely used in headlights, housings, and structural automotive elements.)
🔹 What is PC+Makrolon
Makrolon® is the trade name for high-performance polycarbonate developed by Covestro (formerly Bayer MaterialScience). “PC+Makrolon” refers to pure polycarbonate or derivative blends based on Makrolon®, often modified with flame retardants, elastomers, or fibers.
The material is recognized for its superior optical clarity, thermal stability, and excellent rigidity, making it the top choice for car parts that must endure over time without deformation or yellowing.
🔧 Composition
- Polycarbonate (Makrolon® PC): 95–100 % (pure base).
- Optional Additives: 0–5 % (UV stabilizers, antistatics, flame retardants).
- Density: 1.19–1.21 g/cm³.
- Melting Point: ≈ 230–240 °C.
- Chemical Resistance: Moderate (sensitive to strong solvents).
- Transparency: Up to 90 % (glass-like optical clarity).
🚗 Where PC+Makrolon is used in the automotive industry
| Component | Example parts | Observations |
| Headlights / Taillights | Lenses, covers, diffusers | Excellent clarity and UV stability |
| Car Interior | Frames, decorative panels | High gloss, premium finish |
| Technical Exterior | Sensor covers, protectors | High impact and vibration resistance |
| Technical / Struct. | Module housings, brackets | High hardness and thermal stability |
🔧 Welding Temperature and Methods
| Method | Optimal Temperature | Observations |
| Hot Air | 260 – 280 °C | Ideal method for Makrolon; uniform melting |
| Heat Plate (Mirror) | 250 – 270 °C | Clean weld without bubbles |
| Manual Extrusion | 250 – 270 °C | For long cracks or thick edges |
🔩 What to Weld PC+Makrolon With (Material Compatibility)
As pure or modified polycarbonate, Makrolon has broad compatibility with other materials in the PC family.
✅ Compatible with:
- PC+Makrolon ↔ PC / Lexan / PC+ABS / PC+ASA / PC+PMMA – ideal.
- PC+Makrolon ↔ PC+PBT / PC+GF / PC+HI / PC+FR – good bond.
❌ Incompatible with:
- PP, PE, PA, PVC, PS, simple ABS, TPO – different melting points.
💡 ReplastMD Recommendation:
Use original Covestro PC or Makrolon rods at 265–280 °C. Heating must be slow and uniform — avoid overheating, which leads to yellowing. After welding, optical gloss can be restored with a quick hot air pass or fine polish.
🧠 How to Identify PC+Makrolon
- Engraved marking: >PC<, >Makrolon<, >Bayer<, >Covestro<.
- Glossy or transparent surface, very rigid.
- Natural color: colorless, smoked grey, glossy black.
- Softens at ≈ 260 °C without bubbling.
- ReplastMD practical test: if the part is clear, rigid, and marked >Makrolon<, it is confirmed Covestro premium polycarbonate.
🛠️ PC+Makrolon Welding at ReplastMD:
At our ReplastMD service center (Chisinau, Ciocana sector), we perform professional Makrolon welding for headlight lenses and structural components, providing a clear, bubble-free, and original-strength finish.