The best replacement for buna is viton.

The best alternatives to buna are rated as following:
★★★★★  viton
★★★  epdm
★★★  nitrile
★★★  viton o-rings
★  neoprene
★  viton seals
★  butyl
★  nbr
★  bridge city
  fkm
  hemphill

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buna
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