A heating mantle is a laboratory instrument used to apply heat to a flask or vessel during chemical reactions or other processes that require controlled heating. It consists of a heating element that is embedded in a fabric or metal mantle that surrounds the flask, providing even and consistent heating.

The heating mantle is typically connected to a variable temperature control unit, which allows the user to set and adjust the desired temperature. Heating mantles are commonly used in chemistry, biology, and pharmaceutical laboratories for a variety of applications, such as distillation, reflux, and synthesis. They are preferred over other types of heating devices, such as Bunsen burners or hot plates because they provide more precise and uniform heating, which is important for many types of reactions.