Selecting a Heating Mantle on Amazon.com
A laboratory heating mantle, sometimes called a flask mantle, is an insulated heated container or wrap that is used in laboratories to ensure that solutions and compounds are kept at a desired temperature. Because the vessel never comes into direct contact with the heating element, mantles provide more even heating and less risk of hot spots than other heating methods such as hot plates and Bunsen burners. Some models have a built-in temperature controller, while others require a separate controller. The insulation of a heating mantle is usually comprised of fiberglass cloth. Commonly used with round-bottom flasks, heating mantles are designed to be used with glassware of a specific size and shape. For example, a 50 mL round-bottom flask would not use the same model as a 100 mL flat-bottom flask.
Self-supporting tabletop models allow the heating mantle to be placed on a countertop without the need of a support, while others are designed to be used with a ring stand. Crock-style tabletop heating mantles usually have a built-in rheostat and a replaceable liner. Some crock-style mantles have an integrated support rod to secure the flask from tipping. Built-in one- or two-direction magnet stirrers available on some crock-style models continually stir contents to prevent hot spots. A hemispherical heating mantle covers the top or bottom half of a round-bottom flask, enabling users to view the contents without having to remove the flask from the heater. A spherical mantle provides full coverage of a round-bottom flask to ensure even heating, and has a zipper that connects the top and bottom halves to ensure a snug fit.
Features to consider when selecting a heating mantle include the size and shape of the flask that will be heated, basket ring or self-supporting tabletop style, stirring capability, whether contents need to be viewable, and temperature range. They are available with 120VAC or 240VAC power requirements.