A novel iodine-containing perfluoroelastomer gum 3M~(TM) Dyneon~(TM) Peroxide Cure Perfluoroelastomer PFE 40Z , or Peroxide Cure Perfluoroelastomer PFE 40Z (PFE 40Z) is introduced. It is designed for very rapid peroxide cure, improved processing and enhanced physical properties of conventional perfluoroelastomers (FFKM). The polymer is compared for chemical resistance to conventional peroxide cured FFKM, and the sealing ability is not only demonstrated by a significant reduction in permanent compression set after heat aging, but also further demonstrated by Compression-Stress Relaxation (CSR) data. This data show the actual sealing forces involved during in-service use of articles molded from this new class of perfluoroelastomer. By carefully choosing a specific iodine containing cure site, we introduce a new peroxide curable perfluoroelastomer (PFE 40Z) which shows much improved sealing behavior in hot air and steam at elevated temperatures over conventional peroxide curable perfluoroelastomers, while exhibiting excellent property retention at elevated temperatures.
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