Entech’s Haikun Xu and Lavon Detweiler published a paper at SPE Antec Anaheim 2017 titled “Use of Micron-size Tire Rubbers in Recycled Thermoplastic Polyolefins to Improve Elastomeric Properties.” The abstract points out that thermoplastic polyolefins (TPOs) and thermoplastic vulcanizates (TPVs) are promising elastomeric materials for automotive applications such as headlight surrounds, bumper covers, door gaskets, etc. (Click here for a full list of ideal TPE applications)

A postconsumer TPO was used for this study. Micron-size rubber powders (MRPs) were fabricated from recycled truck tires in large volume, and used as fillers for the twin screw extruder (TSE) compounding of recycled TPOs. The physical and mechanical properties (hardness, MFI, tensile, Izod impact, etc) were extensively tested to study the overall performance of the compounds for automotive and commodity applications.

Results provided in the paper include:

  • Chemical structure “fingerprint” of the recycled TPO
  • Compositional analysis
  • Max degradation temperature
  • Hardness
  • Melt flow index
  • Tensile stress-strain


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