{"product_id":"mr-o-ring-172-viton-o-ring-90a-durometer-pack-of-5","title":"Mr O-Ring 172 Viton O-Ring 90A Durometer - Pack of 5","description":"\u003cp\u003eIn this review the Mr O-Ring 172 Viton O-Ring is presented for technicians and hobbyists who need a durable, high-temperature seal. The bottom line: this pack of five Viton o-rings is best for applications exposed to fuels, oils, high heat and weather because the 90A durometer FKM compound resists petroleum products, ethanol blends and many solvents while maintaining shape across a wide temperature range. The review covers fit, material performance and practical uses so you can decide if these nominal AS568-size rings suit your maintenance needs.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Fluorocarbon rubber (Viton\/FKM) provides strong resistance to heat, ozone and a wide range of chemicals for longer seal life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e The 90A hardness keeps the ring stable under compression and offers reliable sealing in static and low-dynamic applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize accuracy:\u003c\/strong\u003e Nominal 8-1\/4 in ID and 8-7\/16 in OD with actual dimensions close to spec for predictable fit in AS568 applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated from -26C (-15F) to 232C (450F), suitable for very high temperature air and many industrial processes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChemical compatibility:\u003c\/strong\u003e Performs well with petroleum fuels, diesel\/biodiesel blends, mineral oils, silicone greases and many organic solvents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack quantity:\u003c\/strong\u003e Sold as a pack of 5, convenient for small repairs, replacements and keeping spares on hand.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis pack is aimed at mechanics, HVAC technicians, equipment maintainers and DIYers who replace seals on engines, pumps, valves and fittings exposed to fuels, oils or elevated temperatures. The Viton compound and 90A hardness suit static seals and many low-movement joints where chemical resistance and temperature tolerance are priorities.\u003c\/p\u003e\n\u003cp\u003eThose who need extremely soft or flexible o-rings for delicate dynamic seals or food-grade silicone materials should look elsewhere, as this 90A Viton is firmer and formulated for industrial chemical and heat resistance rather than culinary or ultra-low-friction applications.\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\u003eHigh chemical and heat resistance makes these reliable in fuel and oil-exposed systems.\u003c\/li\u003e\n\u003cli\u003eAccurate actual dimensions (8.237 in ID, 8.443 in OD, 0.103 in CS) aid predictable installation in AS568-sized grooves.\u003c\/li\u003e\n\u003cli\u003ePack of five provides immediate spares for maintenance tasks without buying large quantities.\u003c\/li\u003e\n\u003cli\u003eUnlimited shelf-life means spare rings can be stored long term without degradation concerns.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAt 90A durometer the rings are relatively firm, which may not be ideal for delicate dynamic seals requiring softer compounds.\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 rubber, FKM)\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\u003eNominal dimensions\u003c\/td\u003e\n\u003ctd\u003e8-1\/4 in ID, 8-7\/16 in OD, 3\/32 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual dimensions\u003c\/td\u003e\n\u003ctd\u003e8.237 in ID, 8.443 in OD, 0.103 in CS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-26C (-15F) to 232C (450F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack size\u003c\/td\u003e\n\u003ctd\u003e5 rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Mr O-Ring 172 Viton o-ring pack is a practical choice for professionals and DIYers who need a compact supply of chemically resistant, high-temperature seals. Its accurate dimensions, 90A hardness and FKM compound make it good value for fuel systems, pumps and industrial seals where durability and solvent resistance matter.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these o-rings compatible with gasoline and diesel?\u003c\/strong\u003e\u003cbr\u003eYes, the Viton compound performs well with petroleum fuels, diesel and common fuel blends including biodiesel and ethanol blends.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill the 90A hardness work for dynamic shaft seals?\u003c\/strong\u003e\u003cbr\u003e90A is firmer and best for static or low-dynamic seals; for high-speed shaft seals a softer compound may be preferable.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo these follow any size standard?\u003c\/strong\u003e\u003cbr\u003eYes, the rings meet size conventions defined by AS568 and have actual dimensions close to the nominal values for consistent fit.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48231917715675,"sku":"B07R62SBZH","price":41.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/51Kuv29LevL._SL1000_04152eaf-efbb-4758-8135-89b65ed3bef9.jpg?v=1770882442","url":"https:\/\/gearmusthave.com\/products\/mr-o-ring-172-viton-o-ring-90a-durometer-pack-of-5","provider":"GearMustHave","version":"1.0","type":"link"}