VWR® Spinbar® Magnetic Stir Bars, Octagon, PTFE-Coated

Octagonal magnetic stir bars provide consistent, low-friction mixing for routine laboratory applications requiring reliable agitation and suspension.

• PTFE coating provides a durable, inert contact surface for chemical resistance
• Octagon shape improves turbulence for efficient liquid movement
• Alnico magnet offers strong coupling
• Pivot ring reduces friction and chatter
• Autoclavable construction supports reuse in sterile or high-temperature workflows

These stir bars support everyday mixing tasks such as buffer preparation, dissolving reagents, and maintaining suspensions across chemistry and life science workflows.

The PTFE coating provides a durable, inert surface that resists chemical interaction, while the Alnico magnet ensures stable magnetic coupling. The octagonal profile increases surface interaction compared to cylindrical bars, improving mixing efficiency.

Select size based on vessel diameter and fill volume to maintain proper vortex formation. Pivot ring options help reduce friction and improve rotation stability in flat-bottom vessels.