O-ring O-ring (O-rings) is a circular cross-section rubber seal, O-shaped cross-section because, so called O-shaped rubber ring, also known as O-rings. Began to appear in the mid-19th century, the steam engine cylinder seal member was using it for.

Rubber damping products generally use natural rubber and chloroprene rubber, oil resistance of nitrile rubber is used, requirements high and low temperature resistance of the silicon rubber, requirements for the high damping of the butyl rubber.