What size magnetic stir bar should I use?

The Size of the Internal Drive Magnet The size of the magnet inside the stirrer, which may be referred to as the drive magnet, is of great importance when choosing a stir bar size. The length of the bar should be about equal to the magnet size to avoid spinout.

How long can you run a magnetic stirrer?

At maximum power the hot plate will take around 20-30 minutes to boil a large beaker of water. The plate surface temperature can reach over 250°C when the knob is turned to maximum power. WARNING: Do not use the unit for more than 4 hours on maximum heat.

Why is a magnetic stirrer used?

A magnetic stirrer is a device widely used in laboratories and consists of a rotating magnet or a stationary electromagnet that creates a rotating magnetic field. This device is used to make a stir bar, immerse in a liquid, quickly spin, or stirring or mixing a solution, for example.

How do stir bars work?

A stir bar magnet is placed inside a container, immersed in the fluid. A separate magnet (or magnets) is placed underneath the container, so that it attracts to the stir bar magnet. The lower magnet is usually attached to a motor that spins it.

What is the purpose of the magnetic stirrer bar?

How do magnetic stir bars work?

Magnetic stirrers use a rotating magnetic field to move a stir bar around in liquid samples. The movement of this stir bar mixes the sample thoroughly with rapid movement and agitation. The speed of the magnetic field is controlled by the user, so it can be customized to the specific sample that’s being stirred.

How does a magnetic stir bar work?

6.2. A magnetic stirrer is a device widely used in laboratories and consists of a rotating magnet or a stationary electromagnet that creates a rotating magnetic field. This device is used to make a stir bar, immerse in a liquid, quickly spin, or stirring or mixing a solution, for example.

What is a magnetic stir bar?

Magnetic stir bars are stirrers or stirring hotplates used with magnets to mix a liquid or solution by creating a vortex. A number of factors affect magnetic stir bar efficiency and effectiveness, including its size, shape, and material. Sizes (L x Diameter) range from 2 x 2mm to 159 x 27mm and shapes include:

How to avoid spinout when using magnetic stirrer?

The length of the bar should be about equal to the magnet size to avoid spinout. Spinout occurs when the bar loses its coupling with the internal magnet of the stirrer and the bar stops spinning altogether.

How many stir bars are in a fisherbrand stir bar kit?

Includes 16 stir bars. Fisherbrand™ Octagonal Magnetic Stir Bar Kit offers a convenient kit packed in compartmented storage box. Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape for stirring small volumes in vessels such as vials, tubes and gradient makers.

Why choose SP scienceware™ polygon spinbar™ magnetic stirring bars?

SP Scienceware™ Polygon Spinbar™ Magnetic Stirring Bars without Pivot Ring are manufactured in a registered ISO 9001:2008 facility. Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape for stirring small volumes in vessels such as vials, tubes and gradient makers.