Muffle Furnace

Definition - What does Muffle Furnace mean?

A muffle furnace is a type of furnace that is used to heat a material while keeping it isolated from contaminants. A muffle furnace is rectangular in shape and is loaded in the front. They are very heavy insulated which helps to reduce the amount of heat that escapes. This promotes long furnace run times at temperatures up to about 1800 degrees Celsius.

Corrosionpedia explains Muffle Furnace

Muffle furnaces first got their name back when high temperature electric heating was not available. Back then, the heat was created by combustion. The byproducts of combustion could negatively affect the material being heated. It was thus deemed necessary to separate the combustion source and the material being heated. This "muffling" allowed for ideal heating conditions that reduced the risk of contamination.

Muffle furnaces in modern times use electric heating sources. These electric heat sources do not use combustion as a means of releasing energy, therefore no isolating is necessary. Advancements in electric heating sources and insulation materials have allowed modern muffle furnaces to reach and hold temperatures of 1800 degrees Celsius.

Muffle furnaces are used today in a variety of applications. They are often used in lab settings to conduct experiments since the possibility of material contamination is low. Muffle furnaces are also used in joining applications such as brazing or soldering. The high temperatures that a muffle furnace can reach also make them a good choice melting glass.

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