Rotary evaporators can use flasks made of borosilicate glass or flasks with a plastic coating.
These flasks typically range from 50 mL to 4 L in volume.
They are designed to handle the conditions of rotary evaporation, which includes rotation, vacuum, and temperature control.
4 Types of Flasks for Rotary Evaporators: A Detailed Guide
Borosilicate Glass Flasks
Borosilicate glass is commonly used due to its resistance to thermal shock and chemical corrosion.
This type of glass is ideal for rotary evaporators as it can withstand the heating and cooling cycles without breaking.
The flasks are usually compatible with ground glass joints, which are essential for secure connections to the rotary evaporator system.
The joints are standardized, with common sizes being 14/20, 19/22, and 24/40, allowing for compatibility with various accessories like bump traps and condensers.
Flasks with Plastic Coating
For enhanced safety or when working with expensive or sensitive samples, flasks with a plastic coating are recommended.
These flasks provide an additional layer of protection against breakage and can also protect the sample from contamination.
The plastic coating is suitable for temperatures between 40°C to 60°C, and for lower temperatures between -70°C and 40°C in cold track applications.
This coating not only increases safety but also helps in maintaining the integrity of the sample during the evaporation process.
Usage and Compatibility
When using a rotary evaporator, it is crucial to ensure that the flask is securely attached using metal or Keck clips.
These clips are color-coded and correspond to the size of the ground glass joints, ensuring a tight and leak-free connection.
The flask should be no more than half full to allow for efficient rotation and evaporation.
Additionally, an anti-splash vessel or bump trap is recommended between the flask and the evaporator to prevent contamination and splashing of the solvent into the condenser.
Conclusion
The choice of flask for a rotary evaporator depends on the specific requirements of the experiment, including the sensitivity of the sample, the temperature range, and safety considerations.
Both borosilicate glass flasks and those with a plastic coating are suitable, with the latter offering enhanced safety and sample protection.
Proper setup and use of these flasks, along with necessary accessories, ensure efficient and safe operation of the rotary evaporator.
Continue Exploring, Consult Our Experts
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