Failure Pattern
Common to both static and dynamic seals, compression set failure produces flat surfaces on both sides of the o-ring's cross section.
Problem Sources
- Selection of elastomer with poor compression set properties
- Low heat resistance of material
- Excessive swelling of o-ring material in system fluid
- Too much squeeze to achieve seal
- Incomplete curing (vulcanization) of o-ring material during production
- Operating temperature too high for the rubber used
Suggested Solutions
- Employ a low set elastomer
- Specify an o-ring material that resists both operating and friction generated heat
- Re-check o-ring material compatibility with system chemicals
- Reduce o-ring squeeze if possible
- Inspect incoming o-rings for correct physical properties
- Employ a low-set elastomer or higher temperature rated material