The star ring is a four-lip seal, similar in shape to X, so it is also known as the X-ring, it is based on the O-ring performance has been improved and improved, its standard size is completely the same as the American AS568 standard O-ring, can replace most O-ring occasions.
Compared with the O-ring, because the star ring forms a lubricating cavity between the sealing lips, it has less friction resistance and starting resistance.
Because of its flash position in the concave section, so the sealing effect is good. Non-circular section to avoid rolling during reciprocating motion.
So where the O-ring can be used, the star ring can be used instead, and the sealing effect is very good, but where the star ring can be used, the O-ring may not be replaced, which is why the star ring is more expensive than the O-ring.