The X-Ring is similar to the O-Ring in its essential features; it is easy to mount and requires small installation spaces. It can be used as an internal or external seal as well as against changing pressure directions. The X-Ring obtains its sealing effect by compressing its cross-section, which is more flexible than that of an O-Ring.
Advantages over the O-ring:
- The square ring requires less extrusion force to achieve a complete seal.
- This feature provides reduced friction and wear in a dynamic application.
- The square ring’s four-lip seal results in higher sealing performance while forming a lubrication groove that reduces wear.
- A real advantage of the square ring is its inherent stability. In dynamic applications (piston rod sealing), where an O-ring tends to roll in the groove and is thus subjected to torsion, a square ring would only yield.
- Good swelling resistance to mineral oils, greases and diesel fuels.
- Low gas diffusion.
- Insufficient weather and ozone resistance.
- Requires special protective agents.
- Excellent resistance to chemicals and mineral oils.
- High heat resistance.
- Lowest permeability rates for most gases.
- Not resistant to polar solvents.