Muffle Furnace Manufacturers in Ahmedabad Brand: Hema In a muffle furnace, the heating element is typically made from a material like ceramic or metal, which can withstand extremely high temperatures. The furnace's interior is lined with heat-resistant materials such as firebrick or ceramic fiber to reduce heat loss. The outer structure is usually made of metal, which helps maintain the integrity of the furnace. The furnace's design ensures that the heat is evenly distributed within the chamber, providing uniform heating across the materials. This uniform heating is crucial for processes like heat treatment of metals.