Heating mantle

In a common arrangement, electric wires are embedded within a strip of fabric that can be wrapped around a flask.

The current supplied to the device, and hence the temperature achieved, is regulated by a rheostat.

This type of heating mantle is quite useful for maintaining an intended temperature within a separatory funnel, for example, after the contents of a reaction have been removed from a primary heat source.

Another variety of heating mantle may resemble a paint can and is constructed as a "basket" within a cylindrical canister (often made of plastic or metal such as aluminium).

In further contrast to other methods of applying heat to a flask, such as an oil bath or water bath, using a heating mantle generates no liquid residue to drip off the flask.