Octagonal PTFE Magnetic Stir Bar for Curved-Bottom Laboratory Vessels
Product Condition
Unused PTFE magnetic stir bars supplied non-sterile and bagged. No functional testing is applicable for this product type. Available in multiple length options ranging from 25 mm to 100 mm.
Carefully packed and shipped same business day from our Idaho warehouse. Online since 1999. Honest equipment and straightforward service.
Product Overview
Magnetic stir bar with an octagonal PTFE profile and integrated center pivot ring designed for laboratory mixing in curved-bottom containers. The pivot ring maintains consistent contact with concave vessel surfaces, reducing lift-off that commonly occurs with standard cylindrical stir bars. Octagonal geometry increases fluid disruption during rotation, supporting more uniform mixing. PTFE construction provides chemical resistance and thermal stability suitable for routine laboratory use.
Key Features
- Center pivot ring maintains surface contact in curved-bottom vessels
- Octagonal cross-section enhances turbulence during stirring
- PTFE construction for chemical inertness
- Compatible with acids, bases, and organic solvents
- Autoclavable for laboratory sterilization workflows
- Designed for use on standard magnetic stir plates
- Available lengths from 25 mm to 100 mm
Applications
- Mixing in round-bottom flasks
- Stirring in curved vials and concave containers
- Laboratory solution preparation
- Chemical reagent agitation
- Research and analytical lab workflows
- Processes where standard stir bars lose surface contact
Frequently Asked Questions
What is the purpose of the pivot ring?
The pivot ring maintains contact between the stir bar and curved-bottom vessels, reducing lift-off and improving mixing consistency.
How does the octagonal profile differ from cylindrical stir bars?
The octagonal shape creates increased fluid disturbance during rotation, supporting more effective mixing compared to smooth cylindrical profiles.
Are these stir bars chemically resistant?
Yes. PTFE construction provides compatibility with acids, bases, and common organic solvents.
Can these stir bars be autoclaved?
Yes. The PTFE material is suitable for autoclave sterilization.
What sizes are available?
Available lengths include 25 mm, 30 mm, 45 mm, 50 mm, 60 mm, 70 mm, and 100 mm.
This design exists for a simple reason: curved vessels demand constant contact. Once that problem is solved, the rest of the mixing process takes care of itself.
