{"product_id":"188-in-silicone-o-ring-cord-stock-70a-25-ft-red","title":".188 in Silicone O-Ring Cord Stock 70A - 25 ft Red","description":"\u003cp\u003eIn this review of the.188 in silicone O-ring cord stock, the bottom line is simple: this red, 70A durometer cord is intended for technicians and hobbyists who need a reliable, temperature-tolerant sealing material they can cut and form on demand. The reviewer found the cord especially useful where chemical resistance and a wide service temperature range matter, and the 25 ft length makes it convenient for multiple replacement O-rings or custom seals. This review focuses on real-world utility rather than lab claims, and highlights the cord's strengths and practical limits.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eSilicone material:\u003c\/strong\u003e Offers broad resistance to ozone, weather, detergents and many oils, making it suitable for outdoor and equipment seals.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e70A durometer:\u003c\/strong\u003e Provides a medium firmness that balances compressibility and resilience for common static sealing tasks.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eWide temperature range:\u003c\/strong\u003e Performs across extreme temperatures so it can be used from subfreezing applications up to high-heat environments without rapid degradation.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eRound cross-section:\u003c\/strong\u003e The standard round profile simplifies cutting and forming into replacement O-rings or custom profiles using common tools.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003e25 ft length:\u003c\/strong\u003e Supplies enough material for multiple seals or prototypes, reducing the need to source small quantities repeatedly.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Domestic manufacture gives predictable material consistency and traceability for critical projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe best users are maintenance technicians, plumbing and hydraulic hobbyists, and engineers who need a flexible sealing cord that resists weather, ozone and a broad list of oils and hydraulic fluids. It is well suited to making replacement O-rings, gaskets, and custom seals where temperature extremes and chemical exposure are concerns.\u003c\/p\u003e\n\u003cp\u003eThis cord is not the ideal choice for high-abrasion applications or for prolonged exposure to steam above 250 degrees F, strong acids or aromatic hydrocarbons; users needing long-term wear resistance or fuel compatibility should consider alternative elastomers.\u003c\/p\u003e\n\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 overall chemical resistance for many oils and hydraulic fluids, so seals last longer in aggressive environments.\u003c\/li\u003e\n \u003cli\u003e70A hardness gives a practical balance of flexibility and support for static seals and O-rings.\u003c\/li\u003e\n \u003cli\u003eWide service temperature range makes it versatile across outdoor, engine, and low-temperature uses.\u003c\/li\u003e\n \u003cli\u003eGenerous 25 ft length reduces waste and is convenient for multiple repairs or prototypes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eSilicone is vulnerable to mechanical abrasion and prolonged steam exposure, so it may wear faster under friction or in high-steam environments.\u003c\/li\u003e\n \u003cli\u003eNot recommended for use with aromatic hydrocarbons or certain strong acids and bases, limiting some chemical applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eSilicone\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eCross section\u003c\/td\u003e\n\u003ctd\u003eRound\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e0.188 in (3\/16 in actual)\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\u003e25 ft\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003eApproximately -76 F to 437 F (-60 C to 225 C)\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\n\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe.188 in silicone O-ring cord stock is a practical, cost-effective choice for anyone needing a versatile sealing material that handles wide temperature swings and common hydraulic and oil exposures. It represents good value for general repair and prototyping work, though those needing superior abrasion resistance or compatibility with harsh aromatic solvents should look to other elastomers.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this cord be used to make replacement O-rings?\u003c\/strong\u003e\u003cbr\u003eYes. The round cross-section and 70A hardness make it straightforward to cut and form replacement O-rings for static sealing tasks.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs it resistant to engine oil and hydraulic fluids?\u003c\/strong\u003e\u003cbr\u003eSilicone resists engine and transmission oil and many hydraulic fluids, but it is not compatible with all hydrocarbons and is vulnerable to certain aromatic and chlorinated solvents.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat temperature range will it tolerate?\u003c\/strong\u003e\u003cbr\u003eThe cord performs across a broad range up to the mid 400s F and down to severe cold, making it useful in both hot engine and very cold applications.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48608235815131,"sku":"B00QVB01ME","price":42.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71AOKKbdBAL._SL1500_fd7061ab-c789-4a50-a87a-29a6f3f1a9e7.jpg?v=1778424810","url":"https:\/\/gearmusthave.com\/products\/188-in-silicone-o-ring-cord-stock-70a-25-ft-red","provider":"GearMustHave","version":"1.0","type":"link"}