Back up ring

Back-up rings are plastic or rubber rings used to prevent the O-ring from entering the clearance gap. When high pressures are exerted on the O-ring, its soft rubber material can be forced into the clearance gap causing the O-ring to extrude (see our O-ring brochure for examples of O-ring failure). The hard back-up ring material will keep the O-ring material from flowing into the gap which will prevent premature failure. Type of Back up ring: BRT3, BRT4 , N4B , N4W , T3P , T3G