Description
Magnetic stirring bar 40×8 mm is a cylindrical PTFE-coated stir bar designed for reliable mixing in laboratory vessels. It measures 40 mm in length and 8 mm in diameter, with a magnetic core fully encapsulated in polytetrafluoroethylene for broad chemical resistance and smooth contact with glassware. A centre ring helps maintain stable rotation and reduces the risk of the bar spinning off-centre during vigorous stirring. Smooth outer surfaces minimise abrasion of flasks and beakers while supporting even mass transfer in aqueous and many organic media. Supplied by manufacturer Marienfeld in packs of ten pieces, these bars are suited to routine dissolution, titration prep, buffer preparation, and general laboratory agitation on magnetic stirrers and hotplate stirrers. The compact 40 mm length fits common small- to medium-volume vessels, while the PTFE jacket protects the magnet from corrosive reagents. Use this cylindrical centre-ring design wherever consistent, low-wear magnetic stirring is required in everyday wet-lab workflows.
This article is part of Magnetic stirring bars, in Stirring, shaking & mixing.
Key features
- Pack size: 10 pc(s)
- Length: 40 mm
- Diameter: 8 mm
- Shape: Cylindrical with centre ring
- Material: PTFE-coated magnetic core
- EAN: 4250317314994
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Questions about Magnetic stirring bars 40x8 mm,
What is this article?
Magnetic stirring bars 40x8 mm, is the article on this page. Luminix Health distributes Marienfeld for laboratory use. It sits in Magnetic stirring bars, inside Stirring, shaking & mixing, in Lab instruments.
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.
Which category should I open next?
The category is Stirring, shaking & mixing. The sub-category is Magnetic stirring bars. The catalogue is Lab instruments.
Shelves beside this one are Stirring shafts, propellers & impellers, Magnetic stirrers, Stirring & mixing accessories, Homogenisers & dispersers, Shakers, rockers & rotators, Overhead stirrers and Vortex mixers.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
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Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. 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. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.