📘 TPR – ThermoPlastic Rubber

TPR is the general term for a range of thermoplastic elastomers (TPE) made from synthetic rubber and polystyrene (SBS / SEBS). It is a soft, elastic, reusable, and easy-to-process material that combines the flexibility of rubber with the processability of plastic, widely used in the automotive industry, consumer goods, and anti-vibration applications.

🔍 What is TPR TPR is a copolymer based on styrene-butadiene-styrene (SBS) or styrene-ethylene-butadiene-styrene (SEBS), sometimes blended with PP, PE, or PS to adjust stiffness. It behaves elastically when cold and thermoplastically when hot, allowing for welding, injection molding, and recycling. It is often confused with TPE-S, but TPR is the classic industrial name for styrene-based TPEs, which are softer and tackier to the touch.

🔧 Composition

  • SBS / SEBS Copolymer (~60–80 %): Elastic phase – flexibility and adhesion.
  • Polystyrene (PS) / PP (~20–40 %): Rigid phase – stability and processability.
  • Paraffinic oils / Additives (< 10 %): Softness and gloss, Shore A adjustment.

🚗 Automotive Applications

  • Soft seals and protectors: (VW, Toyota, Renault) – Elasticity and vibration damping.
  • Handles, buttons, soft-touch grips: (BMW, Peugeot) – Rubberized, non-slip texture.
  • Flexible covers and guards: (Ford, Dacia) – Flexibility + low impact resistance.
  • Interior aesthetic elements: (Mercedes, Hyundai) – Pleasant-to-the-touch surface.

🔩 Welding Compatibility

  • TPR, TPE-S, SEBS: ✅ Fully compatible – weldable with hot air.
  • PP, PE: ⚠️ Possible, but requires strict temperature control.
  • ABS, PS: ⚠️ Partial welding through chemical diffusion.
  • PA, PC: ❌ Incompatible – different shrinkage and melting points.

🔥 Welding / Bonding TPR at ReplastMD

  • Hot Air: 220 – 250 °C (Clean weld without burning).
  • Heat Plate: ✅ Recommended (Uniform bonding between parts).
  • Ultrasonic: ⚠️ Possible for thin-walled parts.
  • Chemical Bonding: ✅ With styrenic solvents (THF, MEK, toluene).

💡 ReplastMD Recommendation: Weld at ~240 °C with hot air using a TPR or SEBS welding rod. TPR is ideal for gaskets, flexible caps, handles, and interior aesthetic parts, offering a rubberized texture and good resistance to light wear.

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