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Smooth contact for a concave vessel base
Choose smooth PTFE-encapsulated magnetic stir bars for mixing setups using concave-bottomed glassware.
Smooth contact for a concave vessel base
The manufacturer distinguishes these smooth bars from its octagonal center-pivot-ring range. The smooth profile is intended for coupling in concave-bottomed glassware, while the magnet is made from ALNICO and protected by PTFE encapsulation. Selecting the correct bar is therefore not simply choosing the largest magnet: the vessel bottom and the stirring system need to work together.
Select the bar by catalog number and vessel geometry
The current options include 10 × 5, 25 × 8, 30 × 8 and a 35 mm-long bar. Use the metric dimensions for the first three options; the smallest option has an inconsistent inch conversion in the source label. For 120897, the website says 35 × 9 mm while the brochure says 35 × 8 mm. Confirm that width when clearance is critical rather than relying on a silent conversion.
Separate material capability from process validation
PTFE encapsulation isolates the magnet from the liquid, and the supplier describes resistance to decoupling from the sintered magnet construction. Actual coupling still depends on the stirring setup and sample. Published temperature limits differ between the current webpage and brochure, so this listing does not establish a maximum operating temperature. Confirm thermal suitability for heated work. Ten bars of one selected catalog number are supplied, not a mixed-size assortment.
Order the intended pack
120894: 10 × 5 mm smooth bar — Pack of 10. 120895: 25 × 8 mm smooth bar — Pack of 10. 120896: 30 × 8 mm smooth bar — Pack of 10. 120897: 35 mm long smooth bar; confirm width — Pack of 10.
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Heathrow Scientific PTFE Stir Bar Retrievers | 120553
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Frequently Asked Questions
Are these the pivot-ring bars?
No. These are the smooth plain-bar range.
How many are in a pack?
Ten bars of the selected catalog number.
What is inside the PTFE?
The magnet is ALNICO.
Which vessel shape is highlighted?
The manufacturer highlights concave-bottomed glassware for the smooth bars.
Why is 120897 width not stated definitively?
The current webpage lists 9 mm and the brochure lists 8 mm. Confirm the width for a close-fit setup.
What maximum temperature applies?
Published sources disagree, so no definitive maximum is asserted here. Confirm suitability before heated use.
How can the bar be recovered after mixing?
A separate stir-bar retriever is available; choose a handling method appropriate to the liquid and temperature.
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