A Backup ring, also called a backup washer, is used to provide support and prevent the extrusion of the primary sealing element placed around the hydraulic cylinder piston rod. It is made from plastic material and ensures the primary seals, like O-rings retain their shape and sealing capabilities during dynamic movements.

Attributes:
• Helps to reduce the friction between the mating parts
• Ensures the proper sealing function for the cylinder rod

Applications:
A Backup Ring helps maintain hydraulic sealing integrity and acts as a mechanical barrier in preventing the entry of external elements and protecting the primary sealing element from leakage.