{"product_id":"470-o-ring-viton-90a-21-in-id-21-1-2-in-od-high-temperature-seal","title":"470 O-Ring Viton 90A, 21 in ID 21-1\/2 in OD - High Temperature Seal","description":"\u003cp\u003eIn this review the 470 O-Ring made of black Viton is evaluated for mechanical and fluid sealing tasks where chemical and heat resistance matter most. The bottom line: this O-ring is best for technicians and hobbyists who need a compact, high-hardness seal that stands up to fuels, aromatic and aliphatic hydrocarbons, and elevated temperatures. Its biggest advantage is the material choice - \u003cstrong\u003eViton fluorocarbon\u003c\/strong\u003e - which brings broad chemical compatibility and a wide operating temperature range, making it a practical replacement or spare for pumps, heaters, and equipment exposed to harsh fluids.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made of Viton fluorocarbon elastomer, it offers superior resistance to heat, fuels and many chemicals compared with general-purpose rubbers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e The 90A durometer delivers a firm, durable seal suited to static and some dynamic applications where abrasion and extrusion resistance are important.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -15 degrees F to 450 degrees F, it works across cold starts and prolonged high-heat environments without rapid degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-section:\u003c\/strong\u003e Its round cross-section forms a reliable seal between overlapping cylindrical surfaces, which is useful for shafts, housings and closures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard sizing:\u003c\/strong\u003e Manufactured to the Aerospace Standard AS568A sizing, it fits common O-ring grooves and replacements for many industrial parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical compatibility:\u003c\/strong\u003e Compatible with fuels, silicone oil, chlorinated and aromatic hydrocarbons, and many hydraulic fluids for versatile use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis O-ring suits mechanics, HVAC and plumbing technicians, and DIYers who repair pumps, spa heaters, classic car components and equipment exposed to fuels or solvents. The combination of \u003cstrong\u003ehigh durometer\u003c\/strong\u003e and Viton chemistry makes it a good choice where a stiff, resilient seal is needed that will not swell in contact with oils and many fuels.\u003c\/p\u003e\n\u003cp\u003eIt is less suitable for applications requiring soft, highly elastic seals or continuous dynamic sealing with aggressive alkalies, ammonia, or low molecular organic acids, where Viton is vulnerable. Users needing very soft elastomers or compatibility with strong amines should look elsewhere.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExcellent chemical and fuel resistance for long service life in contaminated environments.\u003c\/li\u003e\n\u003cli\u003eWide temperature tolerance supports both cold and high-heat operations without rapid failure.\u003c\/li\u003e\n\u003cli\u003eFirm 90A hardness provides durable performance and good resistance to extrusion in many assemblies.\u003c\/li\u003e\n\u003cli\u003eAS568A sizing makes it easy to replace common O-rings in industrial equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigher durometer can be stiff for some static seals requiring very low compression force, and a few users reported occasional leaks when fit or groove design was marginal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eMr O-Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eViton (fluorocarbon elastomer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e90A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner diameter\u003c\/td\u003e\n\u003ctd\u003e21 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter diameter\u003c\/td\u003e\n\u003ctd\u003e21-1\/2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross-section width\u003c\/td\u003e\n\u003ctd\u003e1\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-15 degrees F to 450 degrees F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 470 Viton 90A O-ring is a dependable, value-minded choice for technicians and hobbyists needing a tough seal that resists fuels, many solvents, and high temperatures. Its firm hardness and AS568A sizing make it ideal for replacements in pumps, heaters and automotive systems, though those needing softer or alkali-resistant elastomers should consider alternatives.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this O-ring compatible with gasoline and diesel?\u003c\/strong\u003e\u003cbr\u003eYes, Viton is compatible with many fuels and aromatic and aliphatic hydrocarbons, making it suitable for fuel-related seals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the 90A hardness work for spa heater seals?\u003c\/strong\u003e\u003cbr\u003eYes, the firm 90A durometer is commonly used in spa heater repairs and provides durability, though correct groove fitting is essential to avoid leaks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used in very low temperature environments?\u003c\/strong\u003e\u003cbr\u003eIt can operate down to about -15 degrees F, but below that temperature the material will become less flexible and may not seal as well.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48231453065435,"sku":"B00M8YQY60","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/518tiRee_UL._SL1500_5bc89526-70c9-45a4-b8ea-20074b0de9af.jpg?v=1770704885","url":"https:\/\/gearmusthave.com\/products\/470-o-ring-viton-90a-21-in-id-21-1-2-in-od-high-temperature-seal","provider":"GearMustHave","version":"1.0","type":"link"}