{"product_id":"buna-n-90-durometer-hydraulic-back-up-ring","title":"Buna-N 90 Durometer Hydraulic Back-Up Ring 1\/16 Cross Section","description":"\u003cp\u003eEngineered 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.\u003c\/p\u003e\u003ch2\u003eMaterial \u0026amp; Performance\u003c\/h2\u003e\u003cp\u003eManufactured 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.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e90 Shore A durometer for maximum extrusion resistance\u003c\/li\u003e\n\u003cli\u003eBuna-N (Nitrile) compound for broad chemical compatibility\u003c\/li\u003e\n\u003cli\u003eOperating temperature range: -40°F to +250°F (-40°C to +121°C)\u003c\/li\u003e\n\u003cli\u003eCompatible with petroleum-based hydraulic fluids, mineral oils, and water-glycol fluids\u003c\/li\u003e\n\u003cli\u003eIdeal for use alongside standard AS568 O-rings in high-pressure grooves\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTypical Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHydraulic cylinders and actuators\u003c\/li\u003e\n\u003cli\u003eHigh-pressure pneumatic systems\u003c\/li\u003e\n\u003cli\u003eIndustrial pumps and valves\u003c\/li\u003e\n\u003cli\u003eMobile hydraulic equipment\u003c\/li\u003e\n\u003cli\u003ePiston and rod seal 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