{"product_id":"330-in-buna-n-o-ring-cord-stock-70a-durometer-10-ft","title":".330 in Buna-N O-Ring Cord Stock 70A Durometer - 10 ft","description":"\u003cp\u003eIn this review the reviewer examines the.330 in Buna-N O-ring cord stock to determine if it is a practical choice for common sealing and repair jobs. The bottom line: this 70A durometer, round cord is best for anyone needing a reliable, oil- and hydrocarbon-resistant rubber cord for DIY projects, plumbing seals, or small hydraulic repairs; the single biggest reason to buy is its balance of toughness and flexibility that makes creating custom O-rings or replacing small rubber tires straightforward and long lasting.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Buna-N (Nitrile) construction offers resistance to petroleum and many hydraulic fluids, reducing swelling and failure in oil-exposed applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardness:\u003c\/strong\u003e 70A durometer provides a firm but flexible seal that is easy to cut and glue while holding shape under compression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Usable across a wide temperature band suitable for many workshops and equipment, maintaining sealing performance in typical ambient and warm service conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength and form:\u003c\/strong\u003e Supplied as a 10 ft piece of round cord stock, which is convenient for making multiple custom O-rings or continuous seals without repeated purchases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Domestic manufacture gives confidence in consistent material quality and dimensional accuracy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis Buna-N O-ring cord stock is aimed at machinists, maintenance techs, and hobbyists who need a dependable rubber material that bonds well and resists oil, alcohols, and many aliphatic hydrocarbons. It is especially useful for users making replacement O-rings, small tire repairs, or custom seals where standard sizes are not available.\u003c\/p\u003e\u003cp\u003eThose who should look elsewhere include users with heavy exposure to ozone, UV, or strong solvents such as acetone and esters, because Buna-N degrades in those environments. For extreme low temperature service well below -30 degrees F or high temperature continuous duty above 250 degrees F, a different elastomer would be more appropriate.\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 resistance to petroleum and hydraulic fluids, making it suitable for many oil-exposed seals.\u003c\/li\u003e\n\u003cli\u003e70A hardness balances rigidity and flexibility for easy cutting, gluing, and reliable sealing.\u003c\/li\u003e\n\u003cli\u003eDurable construction with reported longevity in customer use and useful for nonstandard repairs like small tires.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eNot resistant to ozone, sunlight, or solvents such as acetone and certain esters, limiting outdoor or chemical-exposed applications.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eCross section\u003c\/td\u003e\n\u003ctd\u003eRound cord,.330 in (8.4 mm)\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\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\u003e10 ft piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-40 degrees F to 212 degrees F (approx -40 C to 100 C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003ePetroleum, HFA\/HFB\/HFC fluids, vegetable oil, alcohols, acids, aliphatic hydrocarbons\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.330 in Buna-N O-ring cord stock is a practical, good-value choice for workshop repairs and custom seals where oil resistance and reliable mechanical properties matter. It suits hobbyists and maintenance technicians who need an easy-to-use, durable rubber cord, provided the application avoids ozone, UV, and strong ketone or ester exposure.\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 it bonds easily with common rubber adhesives, making assembly of custom O-rings straightforward.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs it safe for use with hydraulic fluids?\u003c\/strong\u003e\u003cbr\u003eIt is compatible with many petroleum-based and common hydraulic fluids, but check compatibility for specific fluids used in your system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan it be used outdoors?\u003c\/strong\u003e\u003cbr\u003eNot recommended for prolonged outdoor exposure due to vulnerability to ozone, sunlight, and weathering; indoor and protected uses are best.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48620316491995,"sku":"B00R0VWPJQ","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/712mL2CVl4L._SL1500_d70ba751-c4ac-4d9a-bb8a-a942c8c36434.jpg?v=1778495218","url":"https:\/\/gearmusthave.com\/products\/330-in-buna-n-o-ring-cord-stock-70a-durometer-10-ft","provider":"GearMustHave","version":"1.0","type":"link"}