Material Thoughts: A TPV for car weather seals, a TPE for EPDM replacement

08/12/2011

The mailbag this week brought news of a new thermoplastic vulcanizate introduced by ExxonMobil Chemical, plus a thermoplastic elastomer commercially introduced by Alliance Polymers & Services. The former material is being marketed for automotive parts such as glass encapsulated weather seals whereas the latter is of interest to processors seeking a cost-effective replacement for vulcanized rubber and EPDM in applications such as extruded glazing gaskets and seals for refrigerators, dishwashers and other appliances.

From ExxonMobil Chemical (Houston, TX) comes Santoprene M200 TPV for automotive parts such as glass encapsulated weather seals for quarter lights and side fixed glass applications, parts requiring a top appearance. According to the supplier, this thermoplastic vulcanizate (TPV) has a low dynamic viscosity, which results in enhanced flow over a wide range of shear. The result is molded seals with a high-end surface appearance and no flow marks....
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