Techné back-up rings are quick and simple to put into place. To avoid extrusion problems, place a back up ring on the side of the o-ring opposite to the pressure. When pressure is applied on both sides of the seal, insert two back up rings on either side.
Advantages : O-ring life time increased, economic, low sealing cost, allows larger groove machining tolerances, pressure resistance better than o-rings (recommended for applications with pressure higher than 50 bars).
Depending on the application, the chemical environment and the pressure in contact with the back-up ring, Techné will suggest different materials.
They are mostly in NBR and PTFE but can also be provided in FKM, HNBR, PU, POM, PA.