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

• Elastomers 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

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

O-RING RULE OF THUMB #5

The maximum volume of the O-ring should never surpass the minimum volume of the gland. » Learn More