An o ring serves as a barrier, preventing the leak paths between the sealing surfaces. O rings offer several advantages over other sealing systems with its simplicity of construction, standardised seal dimensions, wide selection of materials and suitability for both static and dynamic applications. The most important sealing characteristic of an o ring is its resistance to compression set or residual deformation.
The design of an o ring application is based upon the available technical data and the experience of the specification writer with regard to dimensions and material characteristics within a specific environment or application. O ring glands or grooves are normally cylindrical with flat and parallel faces.
In high pressure applications, Back-up rings are used to prevent the extrusion of the elastomeric material through the clearance gaps when close tolerances are difficult to maintain.
O Ring Materials
O rings are produced from a wide selection of elastomeric materials; NBR, VITON®, EPDM, SILICONE, NEOPRENE and POLYURETHANE are some of the common materials stocked and supplied by us. Please see our material table for a full material selection.
O Rings Fluid Compatibility
To see the resistance of different chemicals to Perfluoroelastomer, Viton® Extreme ETP, Aflas® TFE/P, Viton® FKM, EPDM P.C., Buna-n, Silicone and Fluorosilicone, please see our O Ring Fluid Compatibility Guide.