What is a Muffle furnace?

By arranging a magnetic heat plate inside the furnace and using a partition (muffle) that does not expose the heater, the heat source does not directly hit the sample. In a general muffle furnace, it is used at a normal temperature of around 850 ° C. Electric furnaces used for pottery, etc. have a heater exposed inside, which is distinct from a muffle furnace. The metal or powder that is the sample you want to heat, melt, or dry does not directly hit the heat source, but the sample indirectly adds the heat source, preventing contamination of the sample. Ceramic fiber, which is an inorganic fiber mainly composed of alumina and silica, is used as the heat insulating material in the furnace, and it is a chemically stable material that is resistant to rapid heating and cooling. Depending on the model, there are some that can program control the temperature rise and fall. R thermocouples, K thermocouples, and B thermocouples are used for the temperature sensor, and it is recommended to use an appropriate one because the constituent materials and temperature range are different. As a safety device, an overcurrent breaker and a microcomputer abnormality detection device are attached.

Application of Muffle furnace

A muffle furnace is used for firing ceramics (tiles, glass, insulators) because there is little change in the atmosphere inside the furnace and precise control is required. In the tests of heavy metals and arsenic in the component analysis test, as a pretreatment of the sample, it is sometimes analyzed using the one that has been incinerated using a muffle furnace, and it is used for the tests of pharmaceuticals and foods. In the aching test, a muffle furnace is used to measure the amount of substances remaining when heat is applied to the sample, and it is used for testing pharmaceuticals and foods.

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