{"product_id":"268-viton-o-ring-8-1-2-in-id-75a-pack-of-25-chemical-heat","title":"268 Viton O-Ring 8-1\/2 in ID 75A Pack of 25 - Chemical \u0026 Heat","description":"\u003cp\u003eIn this review the 268 Viton O-Ring pack is assessed for workshop and field use where chemical and heat resistance matter. The bottom line: this pack of 25 rings is best for technicians, hobbyists, and maintenance crews who need reliable replacement seals that resist fuels, aromatic and aliphatic hydrocarbons, and high temperatures up to 400 degrees F. The reviewer found the dimensions and 75A hardness make these rings a practical, cost-effective substitute for more expensive branded parts when compatibility and durability are the priority.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Made from Viton fluorocarbon elastomer, it offers excellent resistance to fuels, oils, and many industrial chemicals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated for use from -15 degrees F to 400 degrees F, so it performs across most engine and industrial temperature conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape and seal:\u003c\/strong\u003e Round cross-section provides a consistent seal between overlapping cylindrical surfaces to reduce leaks under pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e The 75A shore durometer balances resistance to penetration with enough elasticity for reliable compression set performance in common sealing tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Works with non-flammable hydraulic fuels, silicone oil, chlorinated and aromatic hydrocarbons, and is suitable for high vacuum and weathering exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e Supplied as a pack of 25, offering ample spares for routine maintenance and multiple replacement jobs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product suits maintenance technicians, plumbing and hydraulics pros, and PC watercooling or small-engine hobbyists who need replacement O-rings that tolerate heat and contact with fuels and solvents. The pack quantity and standard sizing make it convenient for shops that service multiple similar fittings.\u003c\/p\u003e\n\u003cp\u003eThose who need resistance to strong alkalis, ammonia gas, glycol-based brake fluids, or super-heated steam should look for alternative elastomers, as Viton is vulnerable to those chemicals. Also, if a softer or much harder durometer is required for a specific sealing design, select a part with the appropriate hardness.\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\u003eGood chemical and fuel resistance that covers common hydrocarbons and silicone oils.\u003c\/li\u003e\n\u003cli\u003eHigh temperature capability to 400 degrees F makes it suitable for engine-adjacent uses.\u003c\/li\u003e\n\u003cli\u003ePack of 25 provides value and convenience for repeated repairs.\u003c\/li\u003e\n\u003cli\u003eCustomers report strong fit and leak resistance on common fittings, including MSA fuel bottles and PC watercooling fittings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot compatible with low molecular weight organic acids, amines, or glycol-based brake fluids, limiting use in some automotive and industrial fluids.\u003c\/li\u003e\n\u003cli\u003e75A hardness may be too firm for sealing on highly irregular or low-compression surfaces where a softer compound is preferable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\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\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter\u003c\/td\u003e\n\u003ctd\u003e8-1\/2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e8-3\/4 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross-section Width\u003c\/td\u003e\n\u003ctd\u003e1\/8 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e75A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-15 degrees F to 400 degrees F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 268 Viton O-Ring pack is a solid, pragmatic choice for professionals and hobbyists needing heat- and fuel-resistant seals at a reasonable price. It delivers reliable fit and leak resistance for common hydraulic and fuel applications, and the pack size makes it economical for routine maintenance, though users must avoid fluids that attack Viton.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these O-rings suitable for fuel applications?\u003c\/strong\u003e\u003cbr\u003eYes, Viton is compatible with many fuels and aromatic\/aliphatic hydrocarbons, making these O-rings suitable for standard fuel contact.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill they handle high temperatures in engine environments?\u003c\/strong\u003e\u003cbr\u003eYes, they are rated to 400 degrees F, which covers many engine-adjacent and industrial temperature conditions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use these with brake fluid or ammonia?\u003c\/strong\u003e\u003cbr\u003eNo, Viton is vulnerable to glycol-based brake fluids and ammonia, so choose a different elastomer for those fluids.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48234856349915,"sku":"B000FOLP9Q","price":55.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81iyYJCP7YL._SL1500_78613edc-0377-489c-8996-d1c2b3606188.jpg?v=1770907152","url":"https:\/\/gearmusthave.com\/products\/268-viton-o-ring-8-1-2-in-id-75a-pack-of-25-chemical-heat","provider":"GearMustHave","version":"1.0","type":"link"}