BKS0186-24 1.8mm Section 19mm Bore PTFE 55 Polymer Spiral Back-Up Rings

PTFE Spiral Cut Back-Up Rings: Back-up rings are designed to overcome the problems of O-ring extrusion when the system pressures are greater than the sealing capabilities of an unsupported O-ring. The cold flow characteristics of PTFE are used to full advantage in reducing the extrusion gaps to a minimum and allowing automatic compensation for wear. High resistance to virtually all chemicals, low friction and wear rates render PTFE as the ideal material for anti-extrusion devices. The spiral backup ring is the most common style in use being effectively self-adjusting to diametral tolerances.