Seal ring

Abstract

A seal ring comprising 40 to 94% by weight of a polytetrafluoroethylene powder, 3 to 30% by weight of a heat resistant aromatic polyoxybenzoyl ester resin powder and 3 to 30% by weight of a graphite powder. A stable sealing effect can be obtained for a long period of time since a deformation of the seal ring is small for the use even under a high pressure and an abrasion of an opposite material can be inhibited even if the opposite material is a soft metal. Further a frictional force is small, and a change in a sliding torque is small. Therefore the seal ring is suitable as a seal ring for a power steering where operability and response of the sealing device can be enhanced and also as a seal ring for an automatic transmission which slides at high revolutions and as a seal ring for a shock absorber which is required to have a sealing property under reciprocating sliding environment.

Dependencies are inferred from the claim text.