There are three main kinds of heating elements used in the furnaces under atmospheric conditions:

Metallic nickel-chromium(Ni-Cr), iron-chromium-aluminum(Fe-Cr-Al), non-metallic silicon carbide(SiC), molybdenum disilicide(MoSi₂), etc.

The heating element is selected according to different operating temperatures:

Below 1250°C, Metal heating elements are often used like nickel-chromium(Ni-Cr), iron-chromium-aluminum(Fe-Cr-Al)...

Above 1250℃, use silicon carbide(SiC) or molybdenum disilicide(MoSi₂) heating element

Above 1400℃, Only molybdenum disilicide(MoSi₂) heating element can be used