rubber seal O-ring

The O-ring may be used in static applications or in dynamic applications where there is relative motion between the parts and the O-ring. Dynamic examples include rotating pump shafts and hydraulic cylinder pistons. Static applications of O-rings may include fluid or gas sealing applications in which: the O-ring is compressed resulting in zero clearance, the O-ring material is vulcanized solid such that it is impermeable to the fluid or gas, and the O-ring material is resistant to degradation by the fluid or gas. The wide range of potential liquids and gases that need to be sealed has necessitated the development of a wide range of O-ring materials.