{"product_id":"small-parts-s70-157-25-silicone-o-ring-cord-0-157in-high-temp-seal","title":"Small Parts S70.157\/25 Silicone O-Ring Cord 0.157in - High Temp Seal","description":"\u003cp\u003eIn this review the Small Parts S70.157\/25 silicone O-ring cord stock is evaluated for technicians, hobbyists, and maintenance pros who need a reliable, high-temperature sealing material. The bottom line: this red, 70A durometer silicone cord delivers predictable elasticity and excellent resistance to ozone, weather, and many oils across a very wide temperature range, making it a practical choice when rebuilding seals or cutting custom O-rings. The review focuses on real-world handling, temperature performance, and chemical compatibility to help decide if it fits a given sealing task.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Silicone construction offers stable elasticity and flexibility for a variety of sealing and cushioning uses.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eTemperature range:\u003c\/strong\u003e Rated for extreme temperatures, it performs from very low cold to very high heat for demanding environments.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eDurometer:\u003c\/strong\u003e The 70A hardness provides a balanced firmness that is easy to compress for reliable sealing without being too soft.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eCross-section and length:\u003c\/strong\u003e Supplied as a round cord in a 25 ft piece so users can cut custom O-rings and gaskets as needed.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eChemical resistance:\u003c\/strong\u003e Resists ozone, weathering, detergents, salt water, and many oils, making it suitable for outdoor and marine exposures.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eMade in the U.S.A.:\u003c\/strong\u003e Domestic manufacture means consistent quality control for industrial and maintenance applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis silicone O-ring cord is best for mechanics, HVAC technicians, laboratory technicians, and DIYers who need to fabricate custom seals that will see a wide temperature span or exposure to ozone and weather. It suits repairs on equipment where non-petroleum brake fluids, certain hydraulic fluids, or vegetable and animal oils are present.\u003c\/p\u003e\n\n\u003cp\u003eUsers who need resistance to strong acids, aromatic hydrocarbons like benzene, or long-term water\/steam exposure above 250 degrees F should look for alternative elastomers, since silicone has known vulnerabilities in those specific conditions.\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 functionality: customers report the cord works well for custom O-rings and has reliable sealing performance.\u003c\/li\u003e\n \u003cli\u003eHigh quality: consistent 70A durometer and round cross-section make cutting predictable rings.\u003c\/li\u003e\n \u003cli\u003eWide temperature tolerance: handles very low to very high temperatures useful for varied environments.\u003c\/li\u003e\n \u003cli\u003eChemical and weather resistance: performs well against ozone, detergents, salt water, and many oils.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003eLimited chemical resistance: not suitable for strong acids, certain solvents, or aromatic hydrocarbons.\u003c\/li\u003e\n \u003cli\u003eMechanical wear: silicone is more vulnerable to abrasion and long-term steam above 250 degrees F than some other rubbers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eMr O-Ring\u003c\/td\u003e\n\u003c\/tr\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\u003eDurometer\u003c\/td\u003e\n\u003ctd\u003e70A\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eCross-section\u003c\/td\u003e\n\u003ctd\u003eRound cord, 0.157 in thickness\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e25 ft piece\u003c\/td\u003e\n\u003c\/tr\u003e\n \u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003eApproximately -76 F (-60 C) to 437 F (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 Small Parts S70.157\/25 silicone O-ring cord is a practical, good-value choice for anyone fabricating seals that must resist weathering, ozone, and a range of oils while enduring wide temperature swings. It is not the best choice where abrasion, strong solvents, or high-temperature steam exposure exceed silicone's limits, but for general maintenance, HVAC, and many industrial applications it offers dependable performance and predictable handling.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan I cut custom O-rings from this cord?\u003c\/strong\u003e\u003cbr\u003eYes. The 0.157 in round cord and consistent 70A hardness make it straightforward to cut and join custom O-rings and small gaskets.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWill this cord resist engine oil and hydraulic fluids?\u003c\/strong\u003e\u003cbr\u003eSilicone resists many engine and transmission oils and certain hydraulic fluids, but check specific fluid compatibility for long-term exposure to petroleum-based fuels.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this suitable for steam and high-temperature water applications?\u003c\/strong\u003e\u003cbr\u003eSilicone performs up to high temperatures but is vulnerable to water and steam exposure above about 250 degrees F, so avoid prolonged steam service at higher temperatures.\u003c\/p\u003e","brand":"Mr O-Ring","offers":[{"title":"Default Title","offer_id":48655684796635,"sku":"B00QVB0AL6","price":42.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71AOKKbdBAL._SL1500_99f34dc9-117c-4f68-9eaf-cd12ad9615d4.jpg?v=1778601330","url":"https:\/\/gearmusthave.com\/products\/small-parts-s70-157-25-silicone-o-ring-cord-0-157in-high-temp-seal","provider":"GearMustHave","version":"1.0","type":"link"}