🧩 PP-TD20 – 20% Talc-Filled Polypropylene
(Stiffened weldable plastic, frequently used in bumpers, spoilers, and automotive structural parts)
🔹 What is PP-TD20
PP-TD20 is a polypropylene modified with 20% talc (mineral), which provides increased rigidity, dimensional stability, and resistance to thermal deformation.
It is one of the most widely used materials for modern automotive bodywork due to its low weight and low cost.
🔧 Composition
- PP (Polypropylene) – semi-crystalline base, thermally weldable
- Talc (20 %) – mineral filler that increases stiffness and reduces thermal expansion
- Additives – UV stabilizers, coupling agents, technical colorants
🚗 Where PP-TD20 is used in the automotive industry
| Component | Example parts | Observations |
| Bodywork | Bumpers, spoilers, fender extensions | Lightweight, rigid, resistant to moderate shocks |
| Technical Interior | Door panels, plastic supports | Dimensionally stable, easily processable |
| Auxiliary Structures | Sensor covers, lower parts, mounts | Withstands vibrations and temperatures |
| Tuning / Aftermarket | Custom bumpers and extensions | Can be easily repaired via PP-TD welding |
🔧 Welding temperatures and methods
| Method | Optimal temperature | Observations |
| Hot air | 260 – 280 °C | Most common method, requires PP-TD rod |
| Heat plate (mirror) | 250 – 270 °C | Ideal for plates and flat joints |
| Manual extrusion | 240 – 260 °C | For long cracks or thick sections |
| Ultrasonic | — | Only possible for small and precise parts |
🔩 What to weld PP-TD20 with (Material compatibility)
Many ask what to weld PP-TD20 with — the answer: only with polypropylene of the same type (PP-TD or PP-H).
Talc does not affect compatibility but changes the melting behavior – therefore, the temperature must be adjusted.
✅ Compatible:
- PP-TD20 ↔ PP-TD20 – the most stable and resistant combination
- PP-TD10 / PP-TD30 – partially compatible, can be combined if necessary
- PP-H / PP-C – compatible, but shrinkage differences may occur
- PP+GF – temporary only, not recommended for stress zones
❌ Incompatible:
- PE (Polyethylene) – will not adhere; melting point too low
- ABS, ASA, PC, PA – different chemical structure, impossible to bond
💡 ReplastMD Recommendation:
Use original PP-TD20 welding rods and maintain the temperature between 270–280 °C for uniform melting. Clean the oxidized outer layer before welding for a perfect joint.
🏭 Manufacturers and trade names
| Manufacturer | Brand / Series | Country / Region |
| LyondellBasell | Hostacom® TD20 | Germany / Netherlands |
| Borealis | Daplen® TD20 | Austria |
| SABIC | PP Compound TD20 | Netherlands / Global |
| Hyundai EP | Polytron® TD20 | South Korea |
| Ravago | Enyglos® TD20 | EU |
| TotalEnergies | Polyfort® TD20 | France |
🧠 How to identify PP-TD20
- Engraved marking: >PP-TD20< or >PP-T20<
- Matte surface, rigid, not glossy like ABS
- Yellow-blue flame, smells like paraffin
- Melts uniformly at 270 °C, without bubbles
- At a fine cut, a fine mineral texture (talc) is visible
💡 ReplastMD Practical Test: When heated with hot air, the material becomes soft but not glossy; faint smell of wax → likely PP-TD20.