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With a Shore A hardness of 90, this o-ring delivers superior extrusion resistance under high-pressure conditions, making it the go-to choice for heavy-duty industrial systems.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Buna-N (NBR \/ Nitrile Butadiene Rubber)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e 90 Shore A — harder 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; extrusion resistance superior to standard 70A compounds\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\u003eStandards:\u003c\/strong\u003e Available in AS568 dash sizes\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHydraulic cylinders and actuators\u003c\/li\u003e\n\u003cli\u003eHigh-pressure fittings and manifolds\u003c\/li\u003e\n\u003cli\u003ePumps, valves, and motors\u003c\/li\u003e\n\u003cli\u003eMobile hydraulic equipment\u003c\/li\u003e\n\u003cli\u003eIndustrial machinery and presses\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhy 90A Durometer?\u003c\/h2\u003e\u003cp\u003eWhen operating pressures exceed 1,500 PSI or clearance gaps are larger than standard tolerances allow, a 90A compound prevents the o-ring from extruding into the gap — extending seal life and preventing system failure. 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