{"product_id":"lab-supplies-swn528","title":"PTFE Magnetic Stir Bars, Oval — 20 to 50 mm, 6 Sizes, Each | Globe Scientific","description":"\u003ch2\u003eOval PTFE Magnetic Stir Bars, 20–50 mm Lengths, Sold Each\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eGlobe Scientific Oval PTFE Magnetic Stir Bars\u003c\/strong\u003e deliver smooth, reliable agitation across a wide range of vessel sizes. Encased in inert PTFE, these stir bars suit buffer preparation, reagent dissolution, and continuous mixing in beakers, flasks, and reaction vessels without contaminating the sample.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eMagnetic stir bar, oval\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize (Length × OD)\u003c\/td\u003e\n\u003ctd\u003e20 mm × 10 mm to 50 mm × 20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePTFE-encapsulated magnetic core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\/Cap\u003c\/td\u003e\n\u003ctd\u003eN\/A (sealed PTFE jacket)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSterility\u003c\/td\u003e\n\u003ctd\u003eNon-sterile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003eEach (1 stir bar per pack)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eAvailable Sizes\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e20 mm × 10 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN520\u003c\/td\u003e\n\u003ctd\u003e$17.80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25 mm × 12 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN522\u003c\/td\u003e\n\u003ctd\u003e$19.80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e30 mm × 16 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN524\u003c\/td\u003e\n\u003ctd\u003e$28.60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e35 mm × 16 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN525\u003c\/td\u003e\n\u003ctd\u003e$31.60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e40 mm × 20 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN526\u003c\/td\u003e\n\u003ctd\u003e$40.50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e50 mm × 20 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN528\u003c\/td\u003e\n\u003ctd\u003e$52.10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBuffer and media preparation in volumetric flasks and beakers\u003c\/li\u003e\n\u003cli\u003eDissolution of powders, salts, and solid reagents\u003c\/li\u003e\n\u003cli\u003eContinuous mixing during titrations and pH adjustment\u003c\/li\u003e\n\u003cli\u003eHomogenizing samples prior to aliquoting or analysis\u003c\/li\u003e\n\u003cli\u003eReaction agitation in small to mid-volume vessels\u003c\/li\u003e\n\u003cli\u003eCell culture media blending and reagent equilibration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eQuality \u0026amp; Procurement\u003c\/h2\u003e\n\u003cp\u003ePurchase from labsupplies.com, an authorized Globe Scientific dealer shipping from US inventory. Packaging carries lot numbers to support traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available for volume orders across all six sizes.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat temperature can these PTFE stir bars withstand?\u003c\/h3\u003e\n\u003cp\u003ePTFE remains chemically and thermally stable across typical laboratory ranges, tolerating sustained heating on hot plate stirrers. Avoid direct flame and temperatures approaching the PTFE softening point to preserve the encapsulation.\u003c\/p\u003e\n\u003ch3\u003eHow do I choose the right stir bar size?\u003c\/h3\u003e\n\u003cp\u003eMatch the stir bar length to roughly the diameter of your vessel base. Smaller 20–25 mm bars suit beakers and small flasks, while 40–50 mm bars drive mixing in larger volumes and wider vessels.\u003c\/p\u003e\n\u003ch3\u003eAre these stir bars sold individually or in sets?\u003c\/h3\u003e\n\u003cp\u003eEach SKU is sold as a single stir bar (each). Order multiple units or different sizes to build a graduated set covering your range of vessel volumes.\u003c\/p\u003e\n\u003ch3\u003eCan the PTFE coating contaminate sensitive samples?\u003c\/h3\u003e\n\u003cp\u003ePTFE is inert and non-reactive, making it well suited for sensitive chemical, biological, and analytical work. The sealed jacket isolates the magnetic core, preventing metal contact with the sample.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Oval PTFE Magnetic Stir Bars, 20–50 mm\",\n  \"brand\": {\"@type\": \"Brand\", \"name\": \"Globe Scientific\"},\n  \"description\": \"Globe Scientific oval PTFE magnetic stir bars in six sizes from 20 mm to 50 mm long, with inert PTFE jacket for laboratory mixing. 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