Stirrer
Stirrers are exchangeable tools for laboratory stirring devices. They vary in shape and function depending on the application and mixing task.
Product
Stirrer
Stirrers are exchangeable tools for laboratory stirring devices. They vary in shape and function depending on the application and mixing task.
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LaboTechSystems LTS AG
Milian SA
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Guide and selection support
In the laboratory, stirrers are used for the efficient and targeted mixing of liquids and suspensions. They are available in different forms such as rods, propellers, or turbines and are typically interchangeable.
The choice of an appropriate stirrer depends on the type of material, vessel shape, and desired mixing principle. Additional considerations include chemical compatibility, size, and rotation speed.
LabFinder helps quickly identify and source stirring tools by providing compact information on areas of application, variants, and selection guides.
Applications and Benefits
Stirrers are used in laboratories to carry out mixing, dispersing, or suspending processes in a variety of vessels. They enable the uniform blending of liquids, gases, or particles, influencing process speed and quality. Common applications include homogenizing solutions, dissolving solids, and stabilizing suspensions.
Selection Criteria
Key criteria for choosing a stirrer are the viscosity and volume of the medium, the vessel shape, and the stirring device available. Chemical compatibility (e.g., resistance to chemicals) and mechanical stability are also important. The stirrer’s form (rod, propeller, turbine, etc.) influences flow conditions and thus the efficiency of the mixing process. Adjustable or interchangeable stirring blades add flexibility.
Variants and Designs
The range includes magnetic stir bars in various shapes (e.g., rod, dumbbell, or cross-shaped) for magnetic stirrers, and propeller or turbine stirrers for mechanical devices. Special versions such as jet mixers or centrifugal stirrers are used for specific mixing tasks, such as in vessels with narrow openings or for near-bottom flows. Other variants include anchor stirrers, paddle stirrers, dissolvers, or coil stirrers, selected according to process requirements.
Calibration and Maintenance
Stirrers themselves do not require calibration, but regular visual inspections for damage are recommended. Worn or bent blades should be replaced to ensure uniform mixing and prevent mechanical damage to the stirring device. Cleaning depends on the materials used and the media processed; many are autoclavable or can be cleaned chemically.
Limitations of Use
The effectiveness of a stirrer depends on compatibility with the medium and the specific mixing environment. Highly viscous media or high solid concentrations above certain limits require special stirrers or alternative mixing methods. Vessel shape and diameter can also restrict use. For foaming or gas-containing media, suitable stirrer designs must be selected to reduce undesired effects.
Search Terms and Related Terms
Common search terms include stirring rods, stir bars, magnetic stirrers, propeller stirrers, turbine stirrers, anchor stirrers, paddle stirrers, dissolvers, coil stirrers, and blade stirrers. Synonyms or alternative terms are stirring aids and stirring tools.
Also known as
anchor stirrer
blade stirrer
coil stirrer
dissolver
magnetic stirrer
paddle stirrer
propeller stirrer
stir bars
stirring rods
turbine stirrer
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Suitable brands
Frequently asked questions
How does a stirrer work in the laboratory?
A stirrer creates a flow in the liquid medium through rotation, enabling uniform mixing. Depending on its design, it generates different flow patterns to effectively mix solid, liquid, or gaseous phases.
What types of stirrers are used in the laboratory?
Common types in the lab include magnetic stir bars in various shapes, propeller stirrers, turbine stirrers, anchor stirrers, paddle stirrers, and specialist types like jet mixers or centrifugal stirrers.
What criteria are important when selecting a suitable stirrer?
Selection depends on the volume, viscosity, and composition of the medium, vessel shape, and desired mixing principle. Material compatibility and mechanical requirements should also be considered.
How often do stirrers need to be maintained or replaced?
Stirrers should be regularly checked for damage. In case of wear, deformation, or material failure, replacement is recommended. Cleaning intervals depend on the media being processed.
What are the limitations of using stirrers?
Highly viscous or solid-rich media require special stirrer types. Vessel size and shape can also limit suitability. For foaming media, specialized stirrer designs help minimize unwanted effects.
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