Rubber / Elastomers
  •      • Neoprene / chloroprene / polychloroprene (closed-cell and open-cell)
  •      • Nitrile rubber / Buna-n / Perbunan / NBR / acrylonitrile butadiene rubber
  •      • SBR rubber / sythetic rubber / styrene butadiene / red rubber (in red and black)
  •      • E.P.D.M. rubber / EPDM rubber / ethylene propylene diene monomer rubber / peroxide-cured EPDM
  •      • Silicone rubber / SI rubber (solid, foam, sponge)
  •      • Natural gum / latex
  •      • Viton / FKM
  •      • Butyle
  •      • Cloth inserted, diaphragm sheets
    Cork
  •      • Cork rubber
  •      • Composition cork
  •      • Homogeneous cork
    Teflon/PTFE
  •      • Modified Teflon
  •      • Gylon, Durlon, Gortex
  •      • Expanded Teflon
  •      • Foam Teflon
    Other
  •      • metal shim stock
  •      • plastic shim stock
  •      • beater addition
  •      • vegetable fibre
  •      • copper , brass , steel
  •      • flexible graphite
And many more!