Back-up rings are the most common anti-extrusion devices employed in dynamic and static sealing, designed to prevent the migration of sealing material into the extrusion gap under the system pressure. Parker offers a wide range of back-up ring geometries and materials to suit every seal type and application. They are open or closed shapes for snap assembly made of a broad range of compounds which are highly resistant to thermal or mechanical stress. Parker back-up rings help reduce costly downtime and ensure long-term functional reliability.
 Back-up ring Prädifa series N0300-90, nitrile-butadiene rubber, 90 Shore A, broad applicability, black, Parbak® |
 Nitrile 90 Durometer Backup Ring (N1444-90) |
 Back-up ring Prädifa series V0709-90, fluoroelastomer, 90 Shore A, broad applicability, black, Parbak® |
 Back-up ring Prädifa series XA, Polon® |
 Ethylene Propylene 90 Durometer Backup Ring (E0652-90) |
 Back-up ring Prädifa series XB, Polon® |
 Back-up ring Prädifa series XC, Polon® |
 Anti-Extrusion Ring Prädifa series X1 for Aircraft, Polon® |
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Back-up rings are the most common anti-extrusion devices employed in dynamic and static sealing, designed to prevent the migration of sealing material into the extrusion gap under the system pressure.