Refractories are materials that can withstand high temperatures without melting or breaking down. They are essential in industries that involve extreme heat, such as metal production, glass manufacturing, and cement making. Common types of refractories include fireclay, silica, and magnesia, each chosen for their specific heat resistance and chemical properties. These materials are used to line furnaces, kilns, and reactors, providing insulation and protection against heat and chemical corrosion. The durability of refractories helps improve energy efficiency and prolong the lifespan of industrial equipment, making them a critical component in high-temperature processes.