🧩 PP+EPDMK – Polypropylene with EPDMK Rubber
(Weldable elastic-technical plastic, used in car bumpers, protectors, and flexible exterior parts)
🔹 What is PP+EPDMK
PP+EPDMK is a polypropylene (PP) compound modified with EPDMK rubber – a synthetic elastomer variant with improved resistance to temperature, ozone, and aging.
The result is a semi-elastic material, highly resistant to impact and extreme climatic conditions, with stable behavior under deformation and cracking. It is primarily used for car bumpers, exterior casings, and flexible OEM elements where a balance between rigidity, elasticity, and UV stability is required.
🔧 Composition
- PP (Polypropylene) – rigid thermoplastic component
- EPDMK (Modified Ethylene-Propylene-Diene-Monomer) – elastic rubber 10–20 %
- Additives – UV stabilizers, coupling agents, antioxidants, technical colorants
- Variants: PP+EPDMK10, PP+EPDMK20, PP+EPDMK-TD20
🚗 Where PP+EPDMK is used in the automotive industry
| Component | Example parts | Observations |
| Body / Exterior | Bumpers, covers, fairings, lower guards | OEM standard for flexible bumpers |
| Technical Interior | Side panels, mounts | Vibration resistant, heat stable |
| Engine Compartment | Protectors, sensor covers | Good thermal elasticity |
| Aftermarket / Tuning | Extensions, air diffusers, sport casings | Easy to process and weld |
🔧 Welding temperatures and methods
| Method | Optimal temperature | Observations |
| Hot air | 270 – 290 °C | Uniform melting, no bubbles |
| Heat plate (mirror) | 260 – 280 °C | Clean and resistant joint |
| Manual extrusion | 250 – 270 °C | Ideal for corners and long cracks |
| Ultrasonic | — | Industrial use only |
🔩 What to weld PP+EPDMK with (Material compatibility)
The question “what to weld PP+EPDMK with” is one of the most frequent in bumper repairs. The material is compatible with all types of elastically modified or EPDM rubber-reinforced PP.
✅ Compatible:
- PP+EPDMK ↔ PP+EPDMK – ideal combination
- PP+EPDMK ↔ PP+EPDM / PP+TPO / PP+TPV – very good compatibility
- PP+EPDMK ↔ PP+HI / PP-C – compatible, but more rigid
- PP+EPDMK ↔ PP-TD / PP-MD – partially compatible
❌ Incompatible:
- PE, ABS, ASA, PC, PA, PVC – different structures, will not bond
💡 ReplastMD Recommendation:
Use PP-EPDMK welding rods or PP-EPDM / PP-TPO at a temperature of 275–285 °C. Clean the oxidized area, work with controlled hot air and constant pressure for a homogeneous and elastic joint.
🏭 Manufacturers and trade names
| Manufacturer | Brand / Series | Country / Region |
| LyondellBasell | Hostacom® EPDMK | Germany / Netherlands |
| Borealis | Daplen® EPDMK | Austria |
| SABIC | PP-EPDMK Compound | Netherlands / Global |
| TotalEnergies | Lumicene® EPDMK | France |
| Hyundai EP | Polytron® EPDMK | South Korea |
| Ravago | Enyglos® EPDMK | EU |
🧠 How to identify PP+EPDMK
- Engraved marking: >PP-EPDMK< or >TPO-K<
- Matte surface, semi-elastic, impact resistant
- Yellow-blue flame, faint rubber-paraffin smell
- Softens uniformly at 275 °C, no bubbles
- Density < 1 g/cm³ (partially floats in water)
🛠️ PP+EPDMK Welding at ReplastMD:
At our service center in Chisinau (Ciocana sector), ReplastMD performs professional PP-EPDMK welding for:
- OEM bumpers, spoilers, and flexible guards
- restoration of broken corners and deformed mounts
- aesthetic and structural repairs with compatible rods