Magnetic Stir Bars, 30 mm

For lab users who need several magnetic stir bars for mixing liquid samples, this set includes six white, PTFE-coated bars measuring 8 × 30 mm. They’re intended for stirring liquids or solutions in biological, chemical, medical, and research laboratory applications. Drop a bar into a vessel, place it on a suitable magnetic stir plate, and it can rotate through the liquid without a stirring shaft sitting inside the vessel. It’s a straightforward format for routine mixing, but the listing doesn’t specify a recommended liquid volume or stir-plate compatibility.

Where it shines

The main draw is having six bars in one package, useful when you want spares on hand or need separate bars for different samples. The 30 mm length gives the bar a substantial footprint compared with smaller stir bars, though the product details don’t state which vessel sizes or liquid volumes it suits. If you’re setting up a mixing task, think about the vessel and solution first: the bar needs room to rotate, and the plate needs to maintain a magnetic coupling through the vessel bottom.

The PTFE coating is presented for resistance to acids, alkalis, and a range of organic solvents. That can make this format relevant for varied lab solutions, but it doesn’t establish compatibility with every chemical or every procedure. The maker also describes a built-in pivot axle intended to reduce vibration and wear during stirring. It’s a great fit if you want a reusable, coated bar for general lab mixing, if you prefer a complete stir-plate setup, this package is only the bars.

Highlights

Each bar is white and measures 8 × 30 mm, with PTFE covering around the magnetic core. The set count is useful for keeping a clean bar available between tasks, although no storage case or individual packaging is specified. The listing gives a temperature range of -196 °C to 250 °C and describes the coating as almost insoluble in solvents, those performance claims are according to the maker, not a substitute for checking suitability for a particular sample or method.

One practical scenario: while preparing separate solutions, you can use a bar in each vessel rather than interrupting the workflow to retrieve the same stirrer each time. That convenience depends on having an appropriate magnetic stir plate and enough clearance for a 30 mm bar to turn. No stirring speed, load, or vessel guidance is provided, so demanding mixing jobs may call for a product with more application-specific details.

Best use cases

These bars make the most sense as replacement or spare stir bars for users who already work with magnetic stir plates and need a general-purpose format for laboratory liquids. They’re also a sensible consideration when PTFE coating and the stated chemical and temperature resistance matter more than having a bar in several sizes. If you prioritize a clearly matched bar-and-plate setup, a kit with explicit compatibility and operating guidance may be easier to choose, if you prefer flexibility and already have the equipment, a six-piece bar set keeps the purchase focused.

Should you buy it?

Choose this set when you need six 30 mm PTFE-coated magnetic stir bars for routine solution mixing and can confirm that the dimensions suit your vessels and stir plate. It’s not for you if you need a specified capacity, documented compatibility with a particular instrument, or detailed handling and care instructions—the listing doesn’t provide those. For a lab with a suitable plate already in place, the value is practical rather than elaborate: several matching bars, one stated size, and a coating described for a broad range of lab liquids.