Improvement of O-ring shape With the improvement of sealing performance requirements, there are now some other section shape extrusion sealing rings, the working principle of these sealing rings is similar to O-ring, also belongs to extrusion sealing, but through the change of section shape, improve some performance of O-ring.
1) The X-ring (also known as the star ring) is a sealing ring with four lips. It is a jointless ring, vulcanized in a mold, and its cross-section is approximately square. The X-ring is very similar to the O-ring in use and action. However, it has a more effective sealing performance than the O-ring. The production material of the X-type sealing ring is generally various synthetic rubber.
2) Extrusion sealing rings of other section shapes: ① D-shaped ring ② ordinary triangular section ring ③ star ring.
3) Encapsulation type O-ring: The so-called encapsulation type O-ring is to wrap the O-ring is a material different from its own, so that it has the characteristics of two materials. This type of encapsulated O-ring is available in many forms. Among them, the O-ring coated with teflon is the most used.