As you’d expect, stirrers and mixers are used for mixing a variety of samples in the lab, and there are numerous options available depending on what you’re mixing and the volume you’re working with. Some applications are suited to a magnetic stirrer, which relies on a rotating magnetic field to rotate a stir bar within the liquid. Magnetic stirrers are available with heated or non-heated platforms. Overhead stirrers with a drive motor to power the impeller are better suited for more viscous liquids or larger volumes. For a list of stirrer and mixer manufacturers, see our online directory: LabManager.com/stirrer-mixer-manufacturers
6 Questions to Ask When Buying a Stirrer or Mixer:
- What sample volumes will you be working with?
- What is the intended application? Magnetic stirrers are best suited to applications that require low shear mixing.
- How viscous are the samples? Highly viscous samples may create too much resistance for a magnetic stirrer.
- What mixing speeds are required?
- Is a heated platform required?
- What vessels will you be working with? Overhead stirrers can be used with both flat-bottom vessels and closed reaction systems with round-bottom flasks.
- Does the device have a digital display for speed and torque, as well as a timer?
- What type of motor is used? Are the torque and speed specifications suited to your applications?
Purchasing Tip
Current-generation hotplate stirrers have features that can enhance your research confidence and reproducibility, such as digital controls and high-precision temperature setting. If your research is especially sensitive, look for stirrers that have such features to make your work easier.
Magnetic vs Overhead Stirrers
Can’t decide between a magnetic stirrer and an overhead stirrer? Magnetic stirrers are straightforward and affordable, while overhead stirrers can handle high-viscous liquids better. Learn more about which format best suits your needs at LabManager.com/magnetic-vs-overhead
