Failure Pattern
Occurring primarily in dynamic seals involving reciprocating, oscillating, or rotary motion, this failure pattern can be identified by a flattened surface on one side of the o-ring's cross section.
Problem Sources
- Metal surfaces too rough (acting as an abrasive)
- Metal surfaces too smooth causing inadequate lubrication
- Poor lubrication
- Excessive temperatures
- System contaminated with abrasives
Suggested Solutions
- Use recommended metal finishes
- Provide adequate lubrication (consider internally-lubed o-rings)
- Check material compatibility with system temperature
- Eliminate abrasive contamination with filters and/or wiper seals
- Consider changing to a more abrasive resistant o-ring material such as carboxylated nitrile or urethane