Muffle. It is an oven normally intended for the firing of ceramic materials and for the smelting of metals through thermal energy . Inside the laboratory it is used for substance calcination, substance drying, smelting and control processes.


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  • 1 Description
  • 2 Features
  • 3 Components
  • 4 Uses and applications of muffles
  • 5 Sources


A muffle is a closed chamber made of refractory materials. It consists of a door through which the interior of the cooking chamber is accessed, in which there is a small observation hole. A hole is located in the roof of the oven where the gases come out of the chamber. The walls of the muffle furnace are made of plates of thermal and insulating materials. This oven is used when it is required to reach temperatures higher than 200 ° C. It is necessary to mention that only refractory laboratory materials can be used inside the muffle furnace (For example: A porcelain crucible ), due to the high temperatures that the furnace can reach (1200 ° C).


  • Electric heating controlledby thermostat. • Heating by means of electrical resistances at 1200 Watts of power. • Electric fan-turbine that allows circulation and temperature uniformity throughout the treatment chamber. • Upper entrance for verifying thermometer. • Single phase power supply at 220 Volts .

The muffles have two main types, which perfectly cover the need that is required:

  • Fuelflasks :

A fuel muffle reaches very high temperatures, since its heat source is totally separated from the firing chamber, in such a way that a sample cannot be contaminated with combustion gases.

  • Electric flasks:

Electric muffles are those that have generally small furnaces with hidden heating elements. These are widely used in laboratories, small workshops, or dental offices.



The muffles are made up of certain elements necessary for their proper functioning, including:

  • Internal cabinet.
  • Against door.
  • External cabinet.
  • Temperaturecontrollers .
  • Control Panel.


Uses and applications of the muffles

The muffles are designed to fulfill a wide variety of applications in different areas such as:

  • Flasks for laboratory work.
  • Flasks for control processes.
  • Muffles for thermal treatments.
  • Flasks for drying precipitate.
  • Flasks for calcinationof precipitate.
  • Muffles for castingtests .


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