Magnetic stirring bars

The title names the shape. Cylindrical is the shape named most often. Oval, triangular, octagonal and cross bars are for vessels where that shape sits better. When the title says PTFE, the bar is PTFE-coated. Read the diameter and the length in the title, and choose a bar shorter than the inner width of the vessel.

Compare the length and the diameter in the title with the vessel. A bar that is longer than the inner width will not spin. Accessories for stirrers are in stirring and mixing accessories. Send the vessel size if you want us to check: sales@luminixhealth.com.

A practical rule of thumb: the bar length should be roughly a third to half of the inner diameter of the vessel. Too small a bar mixes weakly; too large a bar starts to jump and decouple from the magnet. For viscous liquids, use a larger bar at a lower speed. Centre the vessel on the stirrer plate. Check that your magnetic stirrer can drive the bar size; see magnetic stirrers. Questions about a specific product? Contact sales@luminixhealth.com.

PTFE is the standard coating and is chemically inert towards most media. Glass-coated bars are for applications where PTFE interferes, for example trace analysis of fluorine, or for work with alkali metals, which attack PTFE. Other coatings, such as PEEK, have their own resistance profile, so rely on what the product page states. Replace a bar once its coating is scratched, as the exposed core can contaminate your sample. Compare coatings in magnetic stirring bars. Unsure which one fits? Ask sales@luminixhealth.com.

Use a stirring bar retriever: a rod with a magnet at the end, which you lower into the vessel until the bar sticks to it. That way you avoid touching the liquid and do not lose the bar when you pour out the contents. Retrievers come in different lengths to suit tall flasks and bottles. They are in stirring and mixing accessories. Need advice for your set-up? Mail sales@luminixhealth.com.

A set with several sizes and shapes is practical in a lab where vessels change often, because you always have a suitable bar at hand. For fixed routines with the same vessel every time, single bars of the right size are more economical. Whatever you use, clean the bars after each run and check the coating regularly for scratches or cracks. Sets and single bars are in magnetic stirring bars. For a quote or a second opinion, write to sales@luminixhealth.com.

A magnetic stirring bar is the magnet coated in PTFE that spins inside a vessel, driven by a stirrer underneath. Length and shape, plain, oval or cross, have to suit the flask. A bar left against a dry glass wall will grind it.

Stirring keeps a mixture uniform or helps a solid dissolve. A magnetic stirrer spins a bar inside a closed vessel. An overhead stirrer drives a shaft when the liquid is viscous or the volume is large. A vortex mixer agitates a tube. A shaker moves a whole rack or a plate. The shape of the impeller and the speed decide whether the liquid turns over or merely spins. The vessels being stirred are indexed under ISO laboratory glassware.

This shelf belongs to Stirring, shaking & mixing, inside Lab instruments. Luminix Health distributes this range for laboratory use.

The neighbouring shelves are Stirring shafts, propellers & impellers, Magnetic stirrers, Stirring & mixing accessories, Homogenisers & dispersers, Shakers, rockers & rotators, Overhead stirrers and Vortex mixers. The category above this shelf is Stirring, shaking & mixing.

Luminix Health distributes this range from the heart of Europe. We deliver across the EU in two to five days if in stock. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. Send a quote request, contact the team, or read who we are. The full brand index is on shop by brand.

The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology. If the article is not on the shelf, request a quote.