{"product_id":"354ft-9-mm-buna-n-o-ring-cord-stock-durable-sealant-choice","title":".354ft (9 mm) Buna-N O-Ring Cord Stock - Durable Sealant Choice","description":"\u003cp\u003eIn this review the.354' (9 mm) Buna-N O-Ring Cord Stock is evaluated for mechanics, hobbyists, and maintenance techs who need a reliable, general-purpose sealing material. The bottom line: this round cord delivers consistent fit and good chemical compatibility for petroleum and common hydraulic fluids, making it a practical replacement material for custom o-rings and repair jobs. The reviewer found it easy to cut and glue, with a firm \u003cstrong\u003e70A durometer\u003c\/strong\u003e that holds shape under compression while offering useful abrasion resistance.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuna-N material:\u003c\/strong\u003e Offers strong resistance to petroleum, HFA, HFB and HFC fluids so it suits many hydraulic and pneumatic sealing tasks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e70A durometer:\u003c\/strong\u003e Provides a firm but flexible sealing surface that retains shape and resists compression set in common service conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide temperature range:\u003c\/strong\u003e Usable across typical workshop temperatures, covering most cold and hot applications encountered in maintenance work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in the U.S.A.:\u003c\/strong\u003e Manufacturing origin gives confidence in consistent compound and dimensional quality compared with unspecified sources.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable sizes and lengths:\u003c\/strong\u003e Comes in varied cross sections and lengths so custom o-rings, gaskets, and tire repair tasks can be prepared without special tooling.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis product is aimed at industrial maintenance crews, hydraulic and pneumatic technicians, and DIY hobbyists who need a durable seal material compatible with petroleum-based fluids and many common oils. It fits projects that require cutting and joining cord to form custom o-rings, small gaskets, or to repair rubber components like small tires.\u003c\/p\u003e\u003cp\u003eThose who need resistance to strong solvents, acetone, esters, or long term outdoor UV exposure should look elsewhere, since Buna-N is vulnerable to ethers and ozone and is not recommended for continuous sun or ozone-exposed applications.\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 hydraulic fluids for broad shop use.\u003c\/li\u003e\n\u003cli\u003eFirm 70A hardness that resists compression set and holds a reliable seal after installation.\u003c\/li\u003e\n\u003cli\u003eEasy to cut and glue into custom o-rings, with customers noting excellent fit and adhesive ease.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eNot suitable for exposure to acetone, esters, or prolonged UV\/ozone environments, limiting outdoor or solvent-heavy 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\u003eCross section\u003c\/td\u003e\n\u003ctd\u003eRound cord,.354' (9 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e70A shore hardness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003eRated roughly -40 F (-40 C) to 212 F (100 C); acceptable use noted to -30 F (-34 C) to 250 F (121 C)\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\u003eManufacture\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.354' Buna-N O-Ring Cord Stock is a solid, value-minded choice for workshop and industrial sealing work where petroleum compatibility and a stable 70A hardness are required. It is particularly good for creating custom o-rings and repairs thanks to consistent dimensions and easy gluing, but avoid it for solvent-rich or UV-exposed applications.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan this cord be glued into o-rings?\u003c\/strong\u003e\u003cbr\u003eYes. Customers report the cord is easy to glue and form into rings using compatible adhesives made for nitrile rubber.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it safe for automotive fuel systems?\u003c\/strong\u003e\u003cbr\u003eBuna-N is compatible with petroleum and many hydrocarbon fluids, making it suitable for many fuel-related seals, but always confirm with the specific fuel and operating temperature.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it handle outdoor exposure?\u003c\/strong\u003e\u003cbr\u003eNo. Buna-N is vulnerable to ozone and UV, so it is not recommended for long-term outdoor or sunlight-exposed seals.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48669350330587,"sku":"B00QVB4UU8","price":39.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/712mL2CVl4L._SL1500_7cd9c7d3-0f2e-42f2-9bcf-2fd4434ba4e0.jpg?v=1778646130","url":"https:\/\/gearmusthave.com\/products\/354ft-9-mm-buna-n-o-ring-cord-stock-durable-sealant-choice","provider":"GearMustHave","version":"1.0","type":"link"}