Wikipedia
Santoprene
Thermoplastic vulcanizates (TPV) are part of the thermoplastic elastomer (TPE) family of polymers, but are closest in elastomeric properties to EPDM thermoset rubber, combining the characteristics of vulcanized rubber with the processing properties of thermoplastics. TPV is a dynamically vulcanized alloy consisting mostly of fully cured EPDM rubber particles encapsulated in a polypropylene (PP) matrix. There are almost 100 grades in the Santoprene TPV product portfolio which are used globally in the automotive, household appliance, electrical, construction and healthcare markets. ExxonMobil is the sole proprietor of the material.