{"product_id":"buna-n-90-durometer-hydraulic-back-up-ring-2","title":"Buna-N 90 Durometer Hydraulic Back-Up Ring 1\/8th Cross Section","description":"\u003ch2\u003eBuna-N 90 Durometer Hydraulic Back-Up Ring\u003c\/h2\u003e\u003cp\u003eEngineered for demanding hydraulic and pneumatic sealing applications, this Buna-N (Nitrile) back-up ring delivers superior extrusion resistance in high-pressure systems. With a 90 Shore A durometer hardness rating, it provides the rigidity needed to prevent primary O-ring extrusion into clearance gaps — extending seal life and maintaining system integrity under sustained pressure.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Buna-N (Nitrile Rubber, NBR)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e 90 Shore A — high hardness for maximum extrusion resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Hydraulic cylinders, pneumatic actuators, high-pressure fluid power systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Petroleum-based oils, hydraulic fluids, water, and many industrial fluids\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAS568 Compatible:\u003c\/strong\u003e Sized to complement standard AS568 O-ring dash numbers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e -40°F to +250°F (-40°C to +121°C)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure Rating:\u003c\/strong\u003e Suitable for high-pressure dynamic and static sealing applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Use a Back-Up Ring?\u003c\/h3\u003e\u003cp\u003eIn high-pressure hydraulic systems, O-rings can extrude into the clearance gap between mating components, causing premature seal failure. A 90 durometer Buna-N back-up ring is installed on the low-pressure side of the O-ring to block this gap, dramatically increasing the pressure rating of the seal assembly and extending service life.\u003c\/p\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHydraulic cylinder rod and piston seals\u003c\/li\u003e\n\u003cli\u003eValve stems and actuator seals\u003c\/li\u003e\n\u003cli\u003eHigh-pressure fittings and manifolds\u003c\/li\u003e\n\u003cli\u003eIndustrial fluid power 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