15-50Mm Magnetic Stirrer Mixer Bars Feature:
Item No. MSB-PR series
Material Polytetrafluoroethylene (PTFE)
Color White
Shape Cylindrical with not Pivot Ring
Size Custom
These stirbars have polygon multifaceted surfaces that add turbulence relative to similar smooth size cylindrical bars.
Alnico magnet encapsulated in FDA Grade, USP Class VI Teflon PTFE low friction coating; durable and inert
Manufactured in a registered ISO 9001:2008 facility, as verified by SGS certification.
NEW Cylindrical Stir Bars
Produced from PTFE
For the stirring of liquids on magnetic stirrers and/or hotplate stirrers
Strong alloy magnets sheathed in pure white inert PTFE
Supplied in polarity aligned packs to ensure maximum coupling strength
Resistant to virtually all chemical attack and temperatures up to 260°C
The stirrer magnet is a bar magnet encapsulated in a material which protects the magnet and prevents contamination of the liquid medium.
How strong are these magnets?
The most relevant measure of a stir bar’s strength is the maximum torque you can feel when twisting it. Stronger torque translates to greater stirring ability before the magnet-to-magnet pair “slips.”
The actual strength you’ll see depends on a number of interrelated factors, which is hard to quantify in a single number. Important factors include:
The size and strength of the stir bar magnet (bigger magnets are stronger)
The size of the stir bar magnet (bigger shapes are pushing more water, which makes them harder to turn)
The magnets used in the stir-plate (bigger = stronger)
The configuration of the magnets underneath the container (2 magnets at the ends of the stir bar vs. a single long magnet)
The distance between the magnets underneath and the stir bar
The viscosity of the fluid (how hard it is to stir)
The rotation speed (RPM)
Stir Bars in Action: Demonstrations
Below is a quick demonstration of how to use a stir bar magnet. The stir-plate mechanism uses a fan from a computer and an old PC power supply as a 12V source.
You might use a simple DC power plug for input power rather than a big power supply. Also consider using a potentiometer to adjust the speed.
Prod # Description Unit
MSB-PR-21 Stir Bar, Cylindrical, PTFE, 6mm x 3mm OD
MSB-PR-22 Stir Bar, Cylindrical, PTFE, 8mm x 3mm OD
MSB-PR-23 Stir Bar, Cylindrical, PTFE, 12mm x 4.5mm OD White PTFE Coated Magnetic Stirring Bars with Pivot Ring
MSB-PR-24 Stir Bar, Cylindrical, PTFE, 15mm x 4.5mm OD
MSB-PR-25 Stir Bar, Cylindrical, PTFE, 20mm x 6mm OD
MSB-PR-26 Stir Bar, Cylindrical, PTFE, 25mm x 6mm OD
MSB-PR-27 Stir Bar, Cylindrical, PTFE, 30mm x 6mm OD Cylindrical Magnetic Stirring Bars PTFE withnot Pivot Ring
MSB-PR-28 Stir Bar, Cylindrical, PTFE, 35mm x 6mm OD
MSB-PR-29 Stir Bar, Cylindrical, PTFE, 40mm x 8mm OD
MSB-PR-30 Stir Bar, Cylindrical, PTFE, 45mm x 8mm OD
MSB-PR-31 Stir Bar, Cylindrical, PTFE, 50mm x 8mm OD Octagonal Magnetic Stirring Bar PTFE with Pivot Ring
MSB-PR-32 Stir Bar, Cylindrical, PTFE, 60mm x 9mm OD
MSB-PR-33 Stir Bar, Cylindrical, PTFE, 70mm x 9.5mm OD
MSB-PR-34 Stir Bar, Cylindrical, PTFE, 80mm x 9.5mm OD
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