PTFE Magnetic Stir Bar, 5/Pack

PTFE Magnetic Stir Bar, 5/Pack

Nanostore’s PTFE Magnetic Stir Bars are available in three shapes to accommodate the full range of standard laboratory vessels and stirring conditions. The Oval shape is optimized for round-bottom flasks and curved-bottom vessels, where its aerodynamic geometry promotes smooth liquid circulation and stable rotation. The Cylinder with Pivot Ring shape is designed for flat-bottom vessels; the central pivot ring stabilizes the bar against the vessel floor, reducing wobble at elevated speeds or with partially settled suspensions. The Plain Cylinder shape provides a versatile option for flat-bottom vessels when low liquid viscosity allows stable rotation without a pivot ring, and its smooth profile minimizes dead zones. The Cross (Octagonal) shape is engineered for viscous liquids and suspension applications, where its multi-lobe geometry generates higher shear forces, disperses sediment more effectively, and maintains coupling at low stirring speeds. All three shapes feature a high-purity PTFE enclosure over a strong magnetic core, providing complete chemical inertness against concentrated acids, bases, and organic solvents. Fully autoclavable and reusable. Packaged 5 per unit in a resealable protective bag.

DIMENSIONAL SPECIFICATIONS:
Oval / 8 x 20 mm (diameter x length): recommended for 10-50 mL round-bottom flasks and small vials
Oval / 10 x 30 mm (diameter x length): general-purpose, recommended for 50-250 mL round-bottom flasks
Oval / 15 x 40 mm (diameter x length): recommended for 250-500 mL round-bottom flasks and larger vessels
Cylinder with Pivot Ring / 8 x 25 mm (diameter x length): recommended for 25-100 mL beakers and flat-bottom flasks
Cylinder with Pivot Ring / 8 x 35 mm (diameter x length): general-purpose, recommended for 100-250 mL flat-bottom vessels
Cylinder with Pivot Ring / 10 x 40 mm (diameter x length): recommended for 250-500 mL beakers and larger flat-bottom containers
Plain Cylinder / 6 x 20 mm (diameter x length): recommended for low-viscosity mixing in 25-100 mL flat-bottom vessels and reagent bottles
Plain Cylinder / 8 x 30 mm (diameter x length): general-purpose, recommended for 100-250 mL flat-bottom vessels with low-viscosity liquids
Plain Cylinder / 10 x 50 mm (diameter x length): recommended for 250-1000 mL flat-bottom vessels requiring extended stirring coverage
Material: virgin PTFE encapsulation over alnico/neodymium magnetic core
Temperature range: -196°C to +260°C
Pack size: 5/Pack

COMMON APPLICATIONS: Magnetic stirring during chemical synthesis, reflux reactions, and solution preparation; dissolution, titration, and buffer preparation workflows; dispersion and suspension of solids and precipitates; inert atmosphere and glovebox stirring; viscous polymer, resin, or biological media mixing; pharmaceutical formulation and quality control; general chemistry, materials science, and academic laboratory use.

USAGE NOTES: Select stir bar length as approximately 1/2 to 1/3 of the vessel’s outer diameter for optimal magnetic coupling. Use the Oval shape for curved-bottom vessels; use Cylinder with Pivot Ring or Plain Cylinder for flat-bottom vessels with aqueous or low-viscosity solutions. For viscous solutions, select a larger diameter to improve torque. Autoclave-safe at 121°C, 15 min. Clean after use with water or appropriate solvents; avoid abrasive tools that may scratch the PTFE surface. Use a magnetic retriever wand for removal. Store away from strong external magnetic fields.