Engineered for high-pressure hydraulic and pneumatic sealing systems, these Buna-N (Nitrile) 90 Shore A Durometer Back-Up Rings are designed to prevent O-ring extrusion in demanding dynamic and static sealing applications. The elevated 90A hardness rating provides superior resistance to gap extrusion under high system pressures, extending the service life of your primary O-ring seal.
Material & Performance
Manufactured from premium Buna-N (Nitrile) rubber, these back-up rings offer excellent resistance to petroleum-based hydraulic fluids, oils, fuels, and lubricants. The 90 durometer hardness delivers the rigidity needed to bridge hardware gaps and protect softer O-rings from damage under pressure spikes.
Key Features
90 Shore A durometer for maximum extrusion resistance
Buna-N (Nitrile) compound for broad chemical compatibility
Operating temperature range: -40°F to +250°F (-40°C to +121°C)
Compatible with petroleum-based hydraulic fluids, mineral oils, and water-glycol fluids
Ideal for use alongside standard AS568 O-rings in high-pressure grooves
