{"product_id":"562-in-9-16-in-buna-n-o-ring-cord-stock-durable-seal","title":".562 in (9\/16 in) Buna-N O-Ring Cord Stock - Durable Seal","description":"\u003cp\u003eIn this review the reviewer tested the.562 in (9\/16 in) Buna-N O-Ring Cord Stock to see whether it delivers reliable sealing and easy handling for general industrial and DIY repair tasks. The bottom line: this cord stock is for users who need a mid-hardness, oil-resistant round cord that bonds and shapes into custom o-rings or seals. Its single biggest selling point is consistent material performance - a 70A Buna-N formulation that handles common petroleum and hydraulic fluids while remaining tough against abrasion and compression set.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuna-N construction:\u003c\/strong\u003e Provides solid resistance to petroleum, HFA, HFB and HFC fluids so it is suitable where oil exposure is expected.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e70A durometer:\u003c\/strong\u003e A balanced hardness that holds shape under compression while remaining flexible enough to form custom o-rings and seals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide temperature range:\u003c\/strong\u003e Rated for typical service from around -40 degrees F to 212 degrees F, covering most workshop and equipment environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in the U.S.A.:\u003c\/strong\u003e Manufactured domestically for consistent quality control and material traceability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound cross section:\u003c\/strong\u003e The cord's round profile simplifies cutting, gluing, and rolling into replacement o-rings or tire-type repairs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe Buna-N cord stock is best for maintenance technicians, hobbyists, and fabricators who need a reliable replacement material for seals exposed to petroleum-based fluids or vegetable oils. It is practical for rebuilding custom o-rings, small pneumatic seals, and even rubber tire replacements mentioned by customers.\u003c\/p\u003e\u003cp\u003eThose who require resistance to solvents such as acetone or prolonged outdoor UV exposure should look elsewhere, because Buna-N is vulnerable to acetone, ethers, esters, ozone and sunlight and is not recommended for ozone-producing environments or constant UV exposure.\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 compatibility with petroleum and hydraulic fluids, making it useful in many industrial fluids applications.\u003c\/li\u003e\n\u003cli\u003eDurable 70A hardness that resists abrasion and compression set for longer seal life.\u003c\/li\u003e\n\u003cli\u003eEasy to glue and form, with customers noting good fit and adhesive ease when making custom o-rings.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eNot suitable for use with acetone, ethers, esters, ozone or prolonged sunlight exposure, limiting outdoor and certain chemical uses.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\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\u003eNominal diameter\u003c\/td\u003e\n\u003ctd\u003e.562 in (9\/16 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\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003eApproximately -40 degrees F to 212 degrees F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChemical compatibility\u003c\/td\u003e\n\u003ctd\u003ePetroleum, HFA, HFB, HFC fluids, vegetable oil, alcohol, acids, aliphatic hydrocarbons\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimitations\u003c\/td\u003e\n\u003ctd\u003eVulnerable to acetone, ethers, esters, ozone, and UV sunlight\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\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.562 in Buna-N cord stock is a solid, cost-effective choice for anyone needing oil-resistant round cord for making or repairing o-rings and seals. Its 70A hardness and domestic manufacture deliver dependable durability and ease of use, though it should be avoided in solvent-rich or high-UV environments. For general shop and hydraulic seal work it represents good value and practical performance.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan this cord be used with petroleum-based hydraulic oil?\u003c\/strong\u003e\u003cbr\u003eYes. Buna-N is compatible with petroleum and many hydraulic fluids listed, making it suitable for those applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the cord resistant to sunlight and ozone?\u003c\/strong\u003e\u003cbr\u003eNo. Buna-N is vulnerable to ozone and prolonged UV exposure, so it is not recommended for outdoor or ozone-generating environments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the hardness and how does it affect use?\u003c\/strong\u003e\u003cbr\u003eThe cord is 70A durometer, which balances flexibility and firmness for making reliable custom o-rings and seals.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48187972321499,"sku":"B00QVB4GXY","price":63.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/712mL2CVl4L._SL1500_16bea034-0c9f-4962-a915-2d3831bf0845.jpg?v=1769529160","url":"https:\/\/gearmusthave.com\/products\/562-in-9-16-in-buna-n-o-ring-cord-stock-durable-seal","provider":"GearMustHave","version":"1.0","type":"link"}