{"product_id":"buna-n-90a-durometer-hydraulic-o-ring-3","title":"Buna-N 90A Durometer Hydraulic O-Ring","description":"\u003ch2\u003eBuna-N 90A Durometer Hydraulic O-Ring\u003c\/h2\u003e\u003cp\u003eEngineered for demanding hydraulic and pneumatic sealing applications, this Buna-N (NBR) O-ring delivers reliable performance under high-pressure conditions. The 90A Shore A durometer rating provides a firmer compound that resists extrusion and maintains dimensional stability in dynamic sealing environments — ideal for hydraulic cylinders, pumps, valves, and actuators.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Buna-N (Nitrile Butadiene Rubber \/ NBR)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e 90A Shore A — firm compound for high-pressure, low-clearance applications\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 hydraulic systems; recommended for use with back-up rings at elevated pressures\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluid Compatibility:\u003c\/strong\u003e Petroleum-based hydraulic oils, mineral oils, diesel fuel, water-glycol fluids, and most aliphatic hydrocarbons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConforms to:\u003c\/strong\u003e AS568 standard dash sizes\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eHydraulic cylinders and actuators\u003c\/li\u003e\n\u003cli\u003ePumps and motors\u003c\/li\u003e\n\u003cli\u003eValves and manifolds\u003c\/li\u003e\n\u003cli\u003ePneumatic fittings and connectors\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eNote: Not recommended for use with phosphate ester fluids, ketones, esters, or highly aromatic fuels. For dynamic applications at pressures above 1,500 PSI, use with a PTFE or nylon back-up ring to prevent 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