Buna N (Nitrile) O-rings (10-year shelf life)

• 70-durometer, B46-70 (31.5% Nitrile) or N470 (30-31% Nitrile) or equivalent
• 90-durometer, C-90-90 (39% Nitrile or equivalent)
• Manufacturer's temperature range rating: -22° to 230° F (-30° to 110° C)
• O-rings are black in color
• Cartridges configured with Buna N seals will also contain one or more of the following seal materials:
  • Hytrel Polyester Elastomer back-up rings
  • PTFE back-up rings and/or Glyd® Ring.
  • Polyurethane 

Fluorocarbon Rubber FKM (Viton®, product of E.I. DuPont) O-rings (20-year shelf life)

• 75-durometer, V14-75 Fluorocarbon or equivalent
• 90-durometer, V23-90 Fluorocarbon or equivalent
• Manufacturer's temperature range rating: -10° to 250° F (-20° to 120° C)
• O-rings are brown in color
• Cartridges configured with Viton® seals will also contain one or more of the following internal seal materials:
  • Viton® back-up rings
  • PTFE back-up rings and/or Glyd® Ring.

EPDM O-rings (No limited shelf life) Ethylene Propylene Diene Monomer*

• 80-durometer EPDM rubber o-rings
• Manufacturer's temperature range rating: -70 to 250° F (-60 to 120°C)
• O-rings are purple in color
• Cartridges configured with EPDM seals will also contain the following seal material:
  • PTFE back-up rings and/or Glyd® Ring.

See our EPDM seals page for more information.

Polyurethane O-rings (10-year shelf life)

• Available for high cycle/higher pressure applications, providing more abrasion resistance for longer seal life.
• 90-durometer hydrolytically stabilized for water compatibility 
• Manufacturer's temperature range rating: -22 to 260° F (-30 to 125°C)
• O-rings are teal in color
• Hytrel Polyester Elastomer back-up rings off white in color (Ref: Simrit-Freudenberg-NOK)