Refractory brick is referred to as fire brick for short. Refractory materials made of refractory clay or other refractory raw materials. Light yellow or brownish. Mainly used in smelting furnaces, it can withstand high temperature of 1,580 ℃ -1,770 ℃ Also called fire brick. Refractories with a certain shape and size. According to the preparation process, it can be divided into fired bricks, non-fired bricks, fused bricks (fused cast bricks), refractory and heat insulation bricks; according to shape and size, it can be divided into standard bricks, ordinary bricks, special bricks, etc. It can be used as high-temperature building materials and structural materials for building kilns and various thermal engineering equipment, and can withstand various physical and chemical changes and mechanical effects at high temperatures. For example, refractory clay brick, high alumina brick, silica brick, magnesium brick, etc.