{"product_id":"139ft-1-8-in-buna-n-o-ring-cord-stock-70a-100-ft-spool","title":".139ft (1\/8 in) Buna-N O-Ring Cord Stock 70A - 100 ft Spool","description":"\u003cp\u003eIn this review the reviewer finds the.139' Buna-N O-Ring Cord Stock to be a practical choice for anyone needing a durable, glueable round cord for custom O-rings and repairs. The biggest reason to buy is its balance of durability and chemical compatibility: the \u003cstrong\u003eBuna-N material\u003c\/strong\u003e resists petroleum fluids and many hydraulic fluids while offering a useful temperature range, making it a versatile workshop staple rather than a precision sealing solution for extreme environments.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Buna-N (Nitrile) provides good resistance to petroleum, HFA, HFB and HFC fluids so it works well in many hydraulic and pneumatic repair tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e The 70A durometer gives a firm, resilient seal that holds shape for custom O-rings and gasket repairs while remaining easy to cut and glue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated for a wide working range so it performs from cold starts to reasonably hot applications without immediate degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength and format:\u003c\/strong\u003e Supplied on a 100 ft spool, it is convenient for frequent small repairs and for producing many replacement rings without repeated ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in the U S A:\u003c\/strong\u003e Domestic manufacture offers predictable material quality and consistent cross section for repeatable fittings.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis cord stock is best for maintenance technicians, hobbyists, and small shops that need to form custom O-rings, replace rubber tires on small wheels, or create seals for general hydraulics and plumbing tasks. Its combination of \u003cstrong\u003edurability\u003c\/strong\u003e and compatibility with petroleum and many hydraulic fluids makes it suitable for everyday workshop use.\u003c\/p\u003e\u003cp\u003eIt is not the ideal choice for applications exposed to ozone, sunlight, or high UV environments, nor for systems requiring chemical resistance to acetone, ethers, or esters. For those situations a different elastomer should be considered.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGood chemical compatibility with petroleum and various hydraulic fluids, making it reliable for many sealing tasks.\u003c\/li\u003e\n\u003cli\u003e70A durometer offers a balance of firmness and flexibility for easy gluing and lasting shape.\u003c\/li\u003e\n\u003cli\u003e100 ft spool provides strong value for repeated repairs and custom ring production.\u003c\/li\u003e\n\u003cli\u003eCustomers report good fit, adhesive ease, and durability in common uses like replacement tires.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eNot resistant to ozone, UV, or certain solvents such as acetone and esters, so it can fail in outdoor or solvent-exposed applications.\u003c\/li\u003e\n\u003cli\u003eSize and leak resistance received mixed comments from some users, indicating verification is recommended for critical seals.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross section\u003c\/td\u003e\n\u003ctd\u003eRound cord\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal thickness\u003c\/td\u003e\n\u003ctd\u003e0.139 in (1\/8 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e70A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e100 ft spool\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eBuna-N (Nitrile, NBR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-40 F to 212 F (-40 C to 100 C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of origin\u003c\/td\u003e\n\u003ctd\u003eMade in the U S A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe.139' Buna-N O-Ring Cord Stock is a solid, cost-effective choice for general maintenance, hydraulic shop repairs, and hobby projects where resistance to petroleum and common hydraulic fluids matters. Buyers seeking a durable, easy-to-glue cord on a large spool will find it good value, but those needing ozone or UV resistance should select a different compound.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan this cord be glued into rings?\u003c\/strong\u003e\u003cbr\u003eYes, customers note it bonds easily with common rubber adhesives designed for nitrile compounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it suitable for outdoor use?\u003c\/strong\u003e\u003cbr\u003eNo, Buna-N is vulnerable to ozone and UV, so outdoor or weather-exposed installations are not recommended.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat fluids is it compatible with?\u003c\/strong\u003e\u003cbr\u003eCompatible with petroleum, HFA, HFB, HFC fluids, vegetable oil, alcohol and some acids; avoid acetone, ethers and esters.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48235003412699,"sku":"B00QVB64PW","price":71.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/815SybkGjpL._SL1500_7a5de5a9-301d-4499-bc52-4f72130e0b7e.jpg?v=1770823858","url":"https:\/\/gearmusthave.com\/products\/139ft-1-8-in-buna-n-o-ring-cord-stock-70a-100-ft-spool","provider":"GearMustHave","version":"1.0","type":"link"}