{"product_id":"lab-supplies-swn511","title":"PTFE Magnetic Stir Bars, Pivot Ring — 12 to 70 mm, 11 Sizes, Pack of 10 | Globe Scientific","description":"\u003ch2\u003ePTFE Magnetic Stir Bars with Pivot Ring — 12 to 70 mm, Pack of 10\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eGlobe Scientific PTFE Magnetic Stir Bars\u003c\/strong\u003e deliver smooth, low-friction mixing across general chemistry, buffer preparation, and reagent dissolution. Each bar pairs a powerful Alnico magnet core with a fully encapsulated PTFE jacket, while the molded pivot ring reduces contact area for quieter rotation and better coupling on standard magnetic stirrers.\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 with pivot ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\/Size\u003c\/td\u003e\n\u003ctd\u003e12 mm to 70 mm length; 4.5 mm to 9.5 mm OD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePTFE-encapsulated Alnico magnet core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\/Cap\u003c\/td\u003e\n\u003ctd\u003eMolded pivot ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGraduation\u003c\/td\u003e\n\u003ctd\u003eNot applicable\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\u003e10 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\u003e12 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN502\u003c\/td\u003e\n\u003ctd\u003e$12.60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e15 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN501\u003c\/td\u003e\n\u003ctd\u003e$12.60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN503\u003c\/td\u003e\n\u003ctd\u003e$13.30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN504\u003c\/td\u003e\n\u003ctd\u003e$15.80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e30 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN511\u003c\/td\u003e\n\u003ctd\u003e$32.60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e35 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN505\u003c\/td\u003e\n\u003ctd\u003e$16.90\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e40 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN507\u003c\/td\u003e\n\u003ctd\u003e$20.70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e45 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN506\u003c\/td\u003e\n\u003ctd\u003e$21.60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e50 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN509\u003c\/td\u003e\n\u003ctd\u003e$23.60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e60 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN508\u003c\/td\u003e\n\u003ctd\u003e$25.80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e70 mm — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN510\u003c\/td\u003e\n\u003ctd\u003e$31.60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDissolving salts and powders during buffer and reagent preparation\u003c\/li\u003e\n\u003cli\u003eContinuous mixing in titration and pH adjustment workflows\u003c\/li\u003e\n\u003cli\u003eSample homogenization in beakers, flasks, and media bottles\u003c\/li\u003e\n\u003cli\u003eMaintaining suspension uniformity in cell culture media prep\u003c\/li\u003e\n\u003cli\u003eGentle agitation in heat-and-stir reactions on hotplate stirrers\u003c\/li\u003e\n\u003cli\u003eLong-bar mixing of large-volume vessels and carboys\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eQuality \u0026amp; Procurement\u003c\/h2\u003e\n\u003cp\u003eStocked and shipped from US inventory by labsupplies.com, an authorized Globe Scientific dealer. Each pack carries a lot number to support traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available — contact our procurement team for volume quotes across multiple sizes.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the pivot ring for?\u003c\/h3\u003e\n\u003cp\u003eThe molded ring at the bar's center contacts the vessel floor, reducing the friction surface. This lets the bar pivot freely, couple more reliably to the drive magnet, and run quietly at both low and high speeds.\u003c\/p\u003e\n\u003ch3\u003eWhat temperature can these stir bars withstand?\u003c\/h3\u003e\n\u003cp\u003ePTFE encapsulation is chemically inert and tolerant of typical hotplate-stirrer temperatures. Avoid prolonged exposure near the PTFE upper limit and confirm your stirrer's plate rating for high-heat reactions.\u003c\/p\u003e\n\u003ch3\u003eHow many stir bars come in a pack?\u003c\/h3\u003e\n\u003cp\u003eEach SKU is sold per pack of 10 bars of a single size. Listed prices are per pack; mix sizes across SKUs to suit different vessel volumes.\u003c\/p\u003e\n\u003ch3\u003eWhich size should I choose for my vessel?\u003c\/h3\u003e\n\u003cp\u003eMatch bar length to roughly two-thirds of the vessel base diameter. 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