Glass evaporating dishes (or crystallizing dishes) are pieces of scientific glassware that can be used to warm chemical solutions over time. They can also help you evaporate solutions, solvents, or other supernatant liquids.*
They are particularly useful for removing extra solvents (like water or alcohol for example), leaving behind a concentrated substance.
There are many industries in which it is useful to leave just solid precipitates behind once solvents are removed. And there’s no better way to do it than with these glass products.
As you might imagine, evaporating dishes should be thermally stable and easy to clean.
While some prefer porcelain for the task, we use borosilicate glass for its durability and corrosion/heat-resistant properties.
Not only that, but these products are exceptionally easy to clean time and again. You can heat them with a bunsen burner or place them within a vacuum oven.
Evaporating Dish Functions:
- storing samples
- removing solvents
Speed up evaporation.
The unique shape of evaporation dishes aids in evaporation in two ways: the liquid inside has a large surface area, speeding up the evaporation process. The open top allows vapors to dissipate when compared to a more contained piece of glass like a beaker or flask.
In beakers, for example, condensation can occur on the vessel walls, impeding the evaporation of the liquid.
Evaporating dishes have multiple uses in the industry such as decanting, storing samples, crystallization and more.
The most common use for this type of evaporating dish is for evaporating supernatant liquids. This lets you achieve crystallization of the solute dissolved in the solvent.
Start small, then expand.
A 100mm evaporating dish is a valuable staple as a means of testing ideas on a small scale. It comes standard with a convenient lip for easy pouring.
Useful for quantitative analysis, these dishes are typically smaller in size and are perfect for running tests before extrapolating the results to a larger scale.
Once your theory has been tested, you can apply the same principles on a much larger, industrial scale through the use of one of our many rotary evaporators.
The addition of a vacuum to a rotary evaporator can make it somewhat safer than an open dish when certain combustible solvents are in use.
Note: We don’t recommend that you use a magnetic stir bar in conjunction with crystallizing dishes, due to the likelihood of splashing or spilling the (potentially hazardous) liquid inside.
*Supernatant liquids are liquids in which a compound has been dissolved. You can extract this dissolved compound later when the liquid is evaporated from the substance.