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      IIR  (0)
      Butyl (IIR):
      Butyl, also known as isobutylene isoprene, has exceptional resistance to gas permeation, along with excellent water and steam resistance. Butyl has a temperature range of -65F to +200F. For most Oring applications, Ethylene Propylene (EP) has replaced Butyl due to similar properties, but with better heat and compression set resistance.

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