Failure Pattern
Occurring in both static and dynamic seals, this failure mode is marked by short cuts, notches, skinned or peripherally peeled surface.
Problem Sources
- Sharp edges on mating components of the o-ring gland
- Sharp threads over which the o-ring must pass during assembly
- Insufficient lead-in chamfer
- Oversize o-ring ID on piston
- Undersize o-ring ID on rod
- Twisting or pinching of o-ring during installation
- No o-ring lubrication during installation
- Low tear resistant elastomers such as Silicone
Suggested Solutions
- Break all sharp edges
- Cover threads with tubes or tape during o-ring installation
- Provide a 15-20° lead-in chamfer
- Install correctly sized o-rings and use lubrication during assembly