What material is typically used to line the interior of a furnace?

The most commonly used material for lining the interior of a furnace is first-quality firebrick. This material is specifically designed to withstand high temperatures and is effective in insulating and protecting the structural components of the furnace. Firebrick has excellent thermal properties, making it capable of withstanding extreme heat without losing its integrity or structure. Its durability and ability to minimize heat loss contribute to efficient furnace operation, making it the preferred choice for furnace linings in various industrial and commercial applications.

While other materials may have specific uses in furnace construction, first-quality firebrick stands out due to its ability to endure the thermal stresses associated with high-temperature environments. Lightweight concrete, refractory cement, and steel plates might have roles in furnace construction or maintenance, but they do not match the performance characteristics and heat resistance provided by firebrick when it comes to lining the furnace interior.