{"product_id":"lab-supplies-swn676","title":"PTFE Magnetic Stir Bars, Cylindrical — 6 to 70 mm, 10\/Pack | Globe Scientific","description":"\u003ch2\u003ePTFE Cylindrical Magnetic Stir Bars, 6 mm to 70 mm, 10 per Pack\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eGlobe Scientific PTFE Cylindrical Magnetic Stir Bars\u003c\/strong\u003e deliver consistent, contamination-free mixing across analytical, synthesis, and sample-prep workflows. Encapsulated in inert PTFE, these bars resist staining and chemical attack while spinning smoothly in beakers, flasks, and reaction vessels. Choose from 13 lengths to match vessel diameter and viscosity, from micro-volume vials to large-batch preparations.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eCylindrical magnetic stir bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVolume\/Size\u003c\/th\u003e\n\u003ctd\u003e6 mm to 70 mm length (3 mm to 9.5 mm OD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eAlnico\/ferrite magnet, PTFE-encapsulated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClosure\/Cap\u003c\/th\u003e\n\u003ctd\u003eSealed PTFE encapsulation, no pivot ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSterility\u003c\/th\u003e\n\u003ctd\u003eNon-sterile; autoclavable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Size\u003c\/th\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\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003cth\u003ePrice (per pack)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6 mm x 3 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN652\u003c\/td\u003e\n\u003ctd\u003e$12.10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8 mm x 3 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN654\u003c\/td\u003e\n\u003ctd\u003e$12.70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e12 mm x 4.5 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN656\u003c\/td\u003e\n\u003ctd\u003e$12.10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e15 mm x 4.5 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN658\u003c\/td\u003e\n\u003ctd\u003e$12.10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20 mm x 6 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN660\u003c\/td\u003e\n\u003ctd\u003e$13.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e25 mm x 6 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN662\u003c\/td\u003e\n\u003ctd\u003e$13.90\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e30 mm x 6 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN664\u003c\/td\u003e\n\u003ctd\u003e$15.10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e35 mm x 6 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN666\u003c\/td\u003e\n\u003ctd\u003e$17.80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e40 mm x 8 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN668\u003c\/td\u003e\n\u003ctd\u003e$17.10\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e45 mm x 8 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN670\u003c\/td\u003e\n\u003ctd\u003e$21.60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e50 mm x 8 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN672\u003c\/td\u003e\n\u003ctd\u003e$23.20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e60 mm x 9 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN674\u003c\/td\u003e\n\u003ctd\u003e$30.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e70 mm x 9.5 mm OD — Bag of 2\u003c\/td\u003e\n\u003ctd\u003eSWN676\u003c\/td\u003e\n\u003ctd\u003e$35.40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDissolving reagents and preparing buffers in volumetric flasks and beakers\u003c\/li\u003e\n\u003cli\u003eMaintaining homogeneous suspensions during titrations and pH adjustment\u003c\/li\u003e\n\u003cli\u003eMixing reaction mixtures in organic and inorganic synthesis\u003c\/li\u003e\n\u003cli\u003eSample agitation in dissolution and extraction protocols\u003c\/li\u003e\n\u003cli\u003eCell culture media and staining solution preparation\u003c\/li\u003e\n\u003cli\u003eContinuous stirring in temperature-controlled water baths and hotplate setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eQuality \u0026amp; Procurement\u003c\/h2\u003e\n\u003cp\u003eGlobe Scientific stir bars ship from US inventory through labsupplies.com, an authorized dealer. Each pack carries lot numbers supporting traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available — contact our team for volume quotes across mixed-size orders.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eAre these stir bars autoclavable?\u003c\/h3\u003e\n\u003cp\u003eYes. The PTFE encapsulation withstands standard autoclave cycles, allowing reuse after sterilization without degrading the magnet or coating.\u003c\/p\u003e\n\u003ch3\u003eHow do I select the right stir bar size?\u003c\/h3\u003e\n\u003cp\u003eMatch the bar length to roughly 60-80% of the vessel's inner diameter. Smaller bars (6-15 mm) suit vials and small flasks, while 40-70 mm bars handle large beakers and viscous solutions.\u003c\/p\u003e\n\u003ch3\u003eWhat is the operating temperature limit?\u003c\/h3\u003e\n\u003cp\u003ePTFE-encapsulated bars tolerate sustained use up to approximately 250 °C, making them suitable for most hotplate-stirrer and heated-bath applications.\u003c\/p\u003e\n\u003ch3\u003eHow many stir bars come in each pack?\u003c\/h3\u003e\n\u003cp\u003eEach SKU is supplied 10 bars per pack at the listed price, so a single order equips multiple stations or provides spares for high-throughput benches.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"PTFE Cylindrical Magnetic Stir Bars, 6 mm to 70 mm\",\n  \"brand\": {\"@type\": \"Brand\", \"name\": \"Globe Scientific\"},\n  \"description\": \"PTFE-encapsulated cylindrical magnetic stir bars in 13 sizes from 6 mm to 70 mm, autoclavable and chemically inert, sold 10 per pack.\",\n  \"sku\": [\"SWN652\",\"SWN654\",\"SWN656\",\"SWN658\",\"SWN660\",\"SWN662\",\"SWN664\",\"SWN666\",\"SWN668\",\"SWN670\",\"SWN672\",\"SWN674\",\"SWN676\"],\n  \"offers\": {\n    \"@type\": \"AggregateOffer\",\n    \"priceCurrency\": \"USD\",\n    \"lowPrice\": \"12.10\",\n    \"highPrice\": \"35.40\",\n    \"offerCount\": 13,\n    \"seller\": {\"@type\": \"Organization\", \"name\": \"labsupplies.com\"}\n  }\n}\n\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these stir bars autoclavable?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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