🧩 PP-C – Polypropylene Copolymer
(Flexible and impact-resistant weldable plastic, used in car bodies and interior parts)
🔹 What is PP-C
PP-C (Polypropylene Copolymer) is a modified version of polypropylene, produced by combining propylene with a small proportion of ethylene.
This structure provides increased elasticity, impact resistance, and excellent performance at low temperatures, making it ideal for bumpers and parts exposed to vibrations.
🔧 Composition
- PP (Polypropylene) – main component
- Ethylene – adds flexibility and crack resistance
- Additives – UV stabilizers, colorants, antioxidants
- Variants: PP-C20, PP-C25, PP-C+TD, PP-C+GF
🚗 Where PP-C is used in the automotive industry
| Component | Example parts | Observations |
| Bodywork | Bumpers, spoilers, liners, trims | Impact-resistant, easy to weld |
| Interior | Door panels, decorative covers | Elastic, does not crack on impact |
| Auxiliary structures | Brackets, lower parts | Good chemical resistance |
| Tuning / Aftermarket | Extensions, mudguards, ornaments | Welds perfectly with PP-C rod |
🔧 Welding temperatures and methods
| Method | Optimal temperature | Observations |
| Hot air | 260 – 280 °C | The most common method |
| Heat plate (mirror) | 250 – 270 °C | For clean flat joints |
| Manual extrusion | 240 – 260 °C | Ideal for long cracks |
| Ultrasonic | — | Only possible industrially |
🔩 What to weld PP-C with (Material compatibility)
Many ask what to weld PP-C with — the answer: with materials from the same polyolefin family, especially other PP types.
The copolymer is compatible with most forms of PP, but not with ABS or PA.
✅ Compatible:
- PP-C ↔ PP-C – ideal combination, elastic and durable joint
- PP-C ↔ PP-H – fully compatible, similar melting points
- PP-C ↔ PP-TD / PP-GF – partially compatible, for local repairs only
- PP-C ↔ PE-HD / PE-LD – low compatibility
❌ Incompatible:
- ABS, ASA, PC, PA, PVC – will not adhere; different temperatures
- PA6, PET, PBT – react differently to heat, will not bond
💡 ReplastMD Recommendation:
Use original PP-C welding rods at 270–280 °C.
Clean the oxidation zone thoroughly and do not overheat – PP-C becomes matte if burned.
🏭 Manufacturers and trade names
| Manufacturer | Brand / Series | Country / Region |
| LyondellBasell | Moplen® EP | Germany / Netherlands |
| Borealis | Daplen® EP | Austria |
| SABIC | PP Copolymer Series | Netherlands / Global |
| Hyundai EP | Polytron® EP | South Korea |
| TotalEnergies | Lumicene® EP | France |
| Repsol | Isplen® EP | Spain |
🧠 How to identify PP-C
- Engraved marking: >PP-C<
- Yellow-blue flame, smells like paraffin
- Floats in water
- Softens at 270 °C without bubbles
- Softer and more elastic than PP-H
💡 ReplastMD Practical Test: If the plastic softens uniformly, is flexible, and returns to its shape after cooling → it is PP-C.