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Seat  & O Rind Material

Lumaco supplies a variety of seat and "O" ring materials for their valves. Request the material desired on the original equipment - - only Viton® has an up charge. (see price list)

Available Material for Each Valve
Minidisc & Doubledisc Seat Teflon, Silicone, Buna, EPDM, Viton®
"O" rings Buna, Viton® EPDM, Silicone, Calrez® (special order)
Betterfly Seat Silicone,EPDM, Viton®, Teflon-coated Viton®
Check Seat & Body "O" rings EPDM, Viton®
ITC Plug Bushings Teflon
"O" rings Silicone

TEFLON:

  • Most commonly used seat material for food application. Has extensive chemical and temperature resistance.
  • Not suitable for great temperature fluctuations: Teflon tends to coldflow and does not return to its original shape.
  • Can be used as a coating on other elastomers.
  • Useful temperature range: -30°F to 400°F

BUNA N:

  • Nitrile compound provides an elastic seat that makes for leak-free, easy handling of valve. Least expensive elastomer.
  • Good chemical resistance: excellent for use with petroleum solvents, gasoline, alcohol, etc...
  • Recommended lubricant: silicone
  • Useful temperature range: -40°F to 225°F

SILICONE:

  • Very good seat material, very elastic self-lubricating - provides a tight easy seal, reducing torque needed to close the valves.
  • Sensitive to certain chemicals: do not use with solvents, petroleum products, etc. (check with us for non-food usage)
  • Useful temperature range: -85°F to 450°F

EPDM:

  • Good for steam and hot water to 350°F
  • Good resistance to mild acids, dilute alkalis, silicone oils and greases, ketones and alcohol.
  • Avoid use for petroleum oils or di-ester base lubricants.
  • Useful temperature range: -65°F to 300°F

VITON®:

  • Both extreme temperature and good chemical resistance.
  • Useful at high temperature when buna or EPDM is not suitable.
  • Recommended lubricant: silicone
  • Useful temperature range: -31°F to 400°F

Viton and Calrez are registered trademarks of DuPont Dow Elastomers.