A barrell of Thermoplastic Vulcanizate (TPV) pellets

Our Primary Material

Thermoplastic vulcanizates are the critical blend components for most of our extrusions.

  • About TPV

    TPV is a polyolefin thermoplastic elastomer.

    It is a dynamically vulcanized (fully cured) EPDM in a matrix of polypropylene.

    TPV allows our seals to perform like thermoset rubber, recycle like plastic, and benefit from qualities unique to itself.

    Materials manager mixes a drum of raw TPV pellets
    • Recyclable and more environmentally friendly
    • Reliable supply chain
    • Light weight (20% lighter than EPDM)
    • Slipcoating available
    • Co- and tri-extrudable
    • Dense or Sponge Extrusions
    • TPV hardness range: SHORE 25 A ~ SHORE 75 D​
    • Consistent material blends
    • Colorable
    • Excellent UV and Ozone resistance

      TPV vs EPDM

      TPV vs EPDM

      EPDM tends to get harder and less flexible when exposed to long-term weathering.  This causes them to lose much of their elongation.

      In cold conditions, TPV’s generally remain closer to their original hardness while EPDM’s tend to get harder.

      TPV vs EPDM

      Hardness Change at -25°C

      ASTM D2240
      A graph comparing hardness change across a variety of gasket materials

      TPV vs EPDM

      In the long term, TPV outperforms EPDM after heat aging in both compression set and stress relaxation.

      TPV vs EPDM

      Weathering Resistance

      Direct Florida Exposure, 2 Years ASTM D412, ASTM D2240
      A graph comparing weathering resistance across a variety of gasket materials
      A graph comparing force retention between common gasket materials
      A graph comparing compression set data between a variety of gasket materials

      TPV vs PVC

      Reed held dozens of TPV and PVC specimens in a heat aging chamber for 12 weeks at 100°C. The results were dramatic: the TPV specimens changed very little, but the PVC specimens shrank by nearly 10%, and became much harder and less elastic.

      Of course, your seal may never see these temperatures, but the results do suggest how these two materials will perform at lower temperatures over an extended period of time.

      A graph comparing the increase in tensile strength between TPV and PVC
      A graph comparing compression set between TPV and PVC in accordance to ASTM test D3958
      A graph comparing loss in length between TPV and PVC
      A graph showing the change in hardness between TPV and EPDM in accordance to ASTM D2250