🧩 PP+EPDM+MD20 – Polypropylene with EPDM Rubber and 20% Mineral Filler
(Semi-elastic and dimensionally stable weldable plastic, used in automotive exterior parts with balanced mechanical strength and flexibility)
🔹 What is PP+EPDM+MD20
PP+EPDM+MD20 is a polypropylene modified with EPDM rubber (for flexibility and shock absorption) and 20% mineral material (usually calcium carbonate or dolomite, for rigidity and stability).
This combination provides a durable, semi-elastic, and thermally stable material, widely used in OEM bumpers, covers, panels, and exterior parts where a balance between hardness and elasticity is needed.
🔧 Composition
- PP (Polypropylene) – thermoplastic base
- EPDM (Ethylene-Propylene-Diene-Monomer) – synthetic rubber 10–15%
- Mineral (20%) – mineral filler (CaCO₃, dolomite, fine talc)
- Additives – UV stabilizers, antioxidants, coupling agents
🚗 Where PP+EPDM+MD20 is used in the automotive industry
| Component | Example parts | Observations |
| Body / Exterior | Bumpers, covers, guards, trims | Good elasticity and thermal stability |
| Technical Interior | Panels, covers, supports | Matte surface, vibration resistant |
| Engine Compartment | Protections, sensor covers | Thermally stable and mechanically resistant |
| Aftermarket / Tuning | Extensions and sport parts | Lightweight, semi-rigid, easy to paint |
🔧 Welding temperatures and methods
| Method | Optimal temperature | Observations |
| Hot air | 265 – 285 °C | Uniform melting, no bubbles |
| Heat plate (mirror) | 260 – 280 °C | Recommended for flat joints |
| Manual extrusion | 250 – 270 °C | Ideal for long cracks and corners |
| Ultrasonic | — | Industrial use only |
🔩 What to weld PP+EPDM+MD20 with (Material compatibility)
The question “what to weld PP+EPDM+MD20 with” often arises during bumper repairs.
The material welds perfectly with similar PP+EPDM or mineral PP compositions, and in their absence, PP-C rod can be used.
✅ Compatible:
- PP+EPDM+MD20 ↔ PP+EPDM+MD20 – ideal combination
- PP+EPDM+MD20 ↔ PP+EPDM / PP+HI – very good compatibility
- PP+EPDM+MD20 ↔ PP-MD20 / PP-TD20 – partially compatible, slightly more rigid
- PP+EPDM+MD20 ↔ PP-C / PP-H – compatible but slightly harder
❌ Incompatible:
- PE, ABS, ASA, PC, PA, PVC – different melting points and structure
💡 ReplastMD Recommendation:
Use original PP-EPDM-MD20 or PP-C welding rods at a temperature of 275–285 °C.
Clean the mineral oxidation zone and apply constant pressure for a complete bond.
🏭 Manufacturers and trade names
| Manufacturer | Brand / Series | Country / Region |
| LyondellBasell | Hostacom® MD20EP | Germany / Netherlands |
| Borealis | Daplen® MD20E | Austria |
| SABIC | PP-EPDM-MD20 | Netherlands / Global |
| TotalEnergies | Lumicene® MD20E | France |
| Hyundai EP | Polytron® EPDM-MD20 | South Korea |
| Ravago | Enyglos® TPO-MD20 | EU |
🧠 How to identify PP+EPDM+MD20
- Engraved marking: >PP-EPDM-MD20< or >TPO-MD20<
- Matte surface, slightly elastic but rigid under pressure
- Yellow-blue flame, faint paraffin smell
- Density slightly above 1 g/cm³ (does not fully float)
- Slow melting at 275 °C, without bubbles
💡 ReplastMD Practical Test: If the bumper is slightly elastic, with medium rigidity and has the >PP-EPDM-MD20< marking → material confirmed.