PTFE Magnetic Stir Bar 30 mm/1.18in

The PTFE Magnetic Stir Bar 30 mm is a compact laboratory mixing accessory for use with compatible magnetic stirrers and vessels. Measuring approximately 30 mm, or 1.18 inches, it provides a practical size for many bench-scale mixing applications. The internal magnet couples with the rotating magnetic field generated by a stirrer, allowing the bar to rotate inside the vessel without a mechanical shaft passing through the container.

The PTFE Magnetic Stir Bar 30 mm has a PTFE exterior that provides a smooth mixing surface and useful resistance to many chemicals. PTFE is commonly used for laboratory stir bars because it can isolate the internal magnetic element from the liquid being mixed. Chemical compatibility should still be confirmed for the specific substance, temperature, and procedure involved.

Performance of the PTFE Magnetic Stir Bar 30 mm depends on vessel shape, liquid volume, viscosity, stirrer strength, bar position, and selected speed. If the bar begins jumping or loses magnetic coupling, reduce the speed and confirm that the stir bar is appropriately sized for the vessel. Different bar shapes and lengths may perform better for particular containers or mixing conditions.

Inspect the PTFE surface before use and remove the stir bar from service if it is deeply scratched, cracked, distorted, or otherwise damaged. Clean it using a method compatible with both the PTFE surface and the material being handled. A magnetic stir-bar retriever can simplify removal from deeper laboratory vessels.

Choose the PTFE Magnetic Stir Bar 30 mm for routine magnetic mixing in compatible laboratory glassware. Browse additional stir bars, magnetic retrievers, hot plates, and mixers in our Lab Heating, Stirring & Mixing Equipment collection.

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Magnetic PTFE Stir Bar Retriever 10in. Compare specifications and confirm dimensions, materials, and configuration requirements before selecting.

Frequently Asked Questions

What size and coating are listed?
The bar is approximately 30 mm or 1.18 inches long and has a PTFE exterior.

Will it mix every liquid?
Performance depends on viscosity, vessel geometry, fill volume, stirrer strength, and speed. Select the bar for the specific setup.

What if it loses coupling?
Reduce speed and check fit and operating conditions. Inspect the coating and clean appropriately before reuse.