Installation Damage

Failure Pattern: Occurring in both static and dynamic seals, this failure mode is marked by short cuts, notches, 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.