Magnetic Star Stir Bar for Magnetic Mixing

The Magnetic Star Stir Bar is a PTFE-coated laboratory mixing accessory with a star-shaped profile for use with compatible magnetic stirrers. Its approximately 42 mm x 5.5 mm dimensions provide a distinctive alternative to conventional cylindrical or pill-shaped stir bars. The internal magnet couples with the rotating field of a magnetic stirrer, allowing mixing without a mechanical shaft entering the vessel.

The star geometry of the Magnetic Star Stir Bar changes how the bar moves liquid compared with traditional straight stir bars and may be useful in appropriately shaped vessels or specific mixing conditions. The PTFE exterior provides a smooth liquid-contact surface and useful resistance to many chemicals. Always verify chemical and temperature compatibility for the actual substance and procedure.

Performance of the Magnetic Star Stir Bar depends on vessel shape, liquid depth, viscosity, stirrer strength, fill volume, and selected speed. No stir-bar shape is ideal for every application. If the bar jumps, rattles excessively, or loses magnetic coupling, reduce the speed and verify that the bar size and geometry are suitable for the vessel and mixing conditions.

Inspect the PTFE coating before each use. Replace the bar if the exterior becomes cracked, deeply scratched, distorted, or otherwise damaged. Clean it with methods compatible with PTFE and the material being handled. A magnetic stir-bar retriever can simplify removal after mixing, particularly from deeper vessels.

Select the Magnetic Star Stir Bar when a star-shaped PTFE stir bar is appropriate for your compatible magnetic mixing setup. Browse additional stir-bar shapes, retrievers, hot plates, and laboratory mixers in our Lab Heating, Stirring & Mixing Equipment collection.

Related Products

Magnetic PTFE Stir Bar Retriever 10in. Compare specifications and confirm dimensions, materials, and application requirements before pairing components.

Frequently Asked Questions

What dimensions are listed?
The PTFE-coated star-shaped stir bar is approximately 42 mm × 5.5 mm.

Is this shape suitable for every liquid?
No. Vessel shape, fill depth, viscosity, stirrer strength, and speed determine whether it is appropriate.

What if it jumps or loses coupling?
Reduce speed and check the bar's size and geometry against the vessel and mixing conditions. Inspect the coating before reuse.