Red brick, also called clay brick, was invented by the ancient Romans. Red bricks are made of clay, shale, etc. They are crushed, mixed and kneaded, and then molded by manual or mechanical pressing. Sintered building brick fired with oxidation flame at about 900 degrees Celsius after drying. The technical label of red brick is generally 75 to 100. Ordinary sintered brick (red brick), also called standard brick, has a size of 240* 1 15*53. (mm) The color is bright red and sometimes dark black. Ordinary clay brick not only has certain strength and durability, but also has certain advantages of heat preservation and sound insulation because of its porosity. Therefore, it is suitable for wall materials and can also be used for building columns, arches, chimneys, floors and foundations. Old buildings often use it as building materials.

Since the reform and opening up, the output of red brick in China has increased geometrically, but many small red brick factories have borrowed soil to burn bricks and dug indiscriminately, resulting in the destruction of a large number of farmland. Therefore, from 1993, the state began to restrict and prohibit brick burning, explicitly prohibiting the production of solid clay bricks and hollow clay bricks, which is the so-called "non-sticky and false" policy, and at the same time advocating and encouraging shale bricks and coal gangue mines.

Aerated brick is a light and porous new building material equipment. The aerated block produced by aerated block equipment has the advantages of light bulk density, high thermal insulation efficiency, good sound absorption and good machinability, and can be made into wall blocks, thermal insulation blocks, pressure panels, floors, wallboard and thermal insulation pipes. At present, aerated block has been widely used in thermal insulation of load-bearing or non-load-bearing structures and pipelines in industrial and civil buildings in China, and has become an important part of new building materials.