Home : Technical Library : Troubleshooting Tech Tips : Solutions for Installation Damage

Solutions for Installation Damage

Failure Pattern
Occurring in both static and dynamic seals, installation damage is marked by short cuts, notches, or a 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

O-RING RULE OF THUMB #11

Static seal cross-sections are generally compressed from 10% to 40%, whereas dynamic seals are from 10% to only 30%. » Learn More