Laboratory Round Bottom Flask Heating

Laboratory Round Bottom Flask Heating

A safe and efficient way to heat liquids in round-bottom flasks


HM Housed Mantle - Lab mantle

Many applications in chemistry, biology, and research laboratories involve heating liquids for research experimentation. Glass roundbottom flasks are commonly used for distilling, chemical reactions, and refluxing. Round-bottom flasks are desirable for these operations because they have a spherical base that allows more surface area to be heated than a standard flat bottom flask. Because of the roundbottom
design, careful consideration must be made to stabilize the flask and keep the flask upright and safe during use. There are several methods for heating round-bottom flasks but most have challenges. Common heating techniques and concerns include:

  1. Open flame – This method can create uneven hotspots and less desirable heating performance. It can also introduce many significant safety hazards in a lab environment.
  2. Oil and water baths – These are uniform heating methods but leave a liquid residue on the flasks and require special handling.
  3. Hot plates – They require additional accessories to accommodate for the round flask shapes in addition to introducing safety concerns.

In addition to simple heating, many of the liquids must be stirred during the heating process. Stirring is required for several reasons:

  1. For quicker dissolving time or to speed-up a reaction
  2. For mixing or to prevent material separation
  3. To assist with a reaction as some reactions require liquid movement

If the process does not include a way to efficiently stir flask contents during the application, additional cost and effort will be required. For
example, extra equipment will need to be purchased or manual stirring will be required.


BriskHeat’s metal-housed mantles with magnetic stirrers are specifically designed to heat round-bottom flasks while stirring the contents.
Sizes range from 100 ml to 1000 ml. A PTFE-coated magnetic stir bar is placed into the contents of the round-bottom flask, and when
the adjustable speed stirring control is activated, an internal magnet underneath the heater rotates causing it to follow and stir the liquid.
The flask rests within the spherically shaped knitted fiberglass heating basket to provide stability and safety. The basket’s spherical
design also allows for premium surface contact to be made around the lower half of the flask for an even distribution of heat. The hightemperature
heating capability up to 450°C (842°F) provides the versatility needed to perform a wide variety of experimentation
processes. The temperature is controlled through a built-in temperature controller. An accessory clamp can be mounted to the heating
mantle’s housing to accommodate a frame rod used for connecting clamps, rings, etc. to the apparatus.

Additional Features:

  • Premium plastic-coated metal housing
  • Chemical resistant
  • Thermally insulated for a safe-to-touch heater
  • Grounded for enhanced electrical safety
  • Built-in 1 or 2 zone heating capability for added versatility
  • Available with or without a built-in temperature controller
  • Available in 120VAC and 240VAC
  • Accessory clamp mounts directly to the mantle’s housing

Types of Users

  • Scientists
  • Chemists
  • Biochemists
  • Researchers
  • Students
  • Lab Techs


  • Biotechnology Research
  • Physical Research
  • Pharmaceutical
  • Laboratory
  • University/Education
  • Chemical Production
  • Medical Science
  • Analytic Chemistry
  • Industrial Inorganic
  • Chemicals
  • Recycling
  • Environmental
  • Wastewater/Treatment
  • Mining
  • Textiles
  • Oil & Gas

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