O-ring

An O-ring is a loop of elastomer with a round (o-shaped) cross-section used as a mechanical seal. They are designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface.

Material

O-ring selection is based on chemical compatibility, application temperature, sealing pressure, lubrication requirements and cost.

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Typical o-ring materials;

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• Nitrile (NBR or Buna N)
• Silicone (VMQ)
• Fluorocarbon (Viton®, FKM)
• Kalrez® (FFKM)
• Fluorosilicone (FVMQ)
• Ethylene Propylene (EPM, EPDM, EP, EPR)
• Neoprene (CR, Chloroprene)
• Polyurethane (AU, EU)