??With the rapid economic development of the o-ring model specification requirements are getting higher and higher, o-rings standardization is the pursuit of China in the 21st century the era, the arrival of the era of personalized slowly, there are some other cross-sectional shapes squeeze-ring, which seals the working principle is roughly the same, just by changing the section from the improved performance of some o-ring.

??1) X-ring (also known as the star circle) is four lip seal. It is a seamless ring, vulcanization molding in a mold, which approximately square cross section. X-ring on the use and effect very much like O-ring. However, it has more effective performance than the O-ring seal. X-ring material is generally produced for a variety of synthetic rubber.

??2) extrusion-ring other cross-sectional shape: ?D ring ? ordinary triangular section ring ?star ring.

??3) encapsulation type O-ring: a so-called encapsulation type O-ring is the O-ring is a different material coated with its own live, it has the characteristics of both materials. This encapsulation type O-ring comes in many forms. Wherein the coating PTFE O-rings use most.