o-rings and seals

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Home > O-ring, Seal Design > Considerations > Considerations 2

Gland Design

Special Considerations, Part 2

Stretching O-rings
Gow-Joule Effect

In addition to compression, the stretch applied to o-rings in service (either to keep the o-ring in the gland during assembly or service, or to aid in the installation) can have an impact on the sealing performance. These effects can include:

  • Reduction in cross section
    As a seal is stretched, the cross section is reduced.
  • Gow-Joule effect (elevated temperatures)
    When an elastomer is stretched and the temperature elevated, the molecular chains will attempt to reduce the imposed stress. Excessive stretch can lead to premature cracking or seal failure.

Rubber Hardness

Next Topic Gland Design Special Considerations, Part 3



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