Lightweight fireclay bricks which content of Al₂O₃ is 30%～46% use clay grog or lightweight clinker and plastic clay as main raw material, generally produced by inclusion of combustible materials as well as chemical coagulation or foam separation can also be taken to form porous structure.

　　Plastic mud that made of mixed with ingredients and water, produced by pressing or casting, drying and sintering in oxidative atmosphere at 1250 ℃～1350℃.

　　Lightweight fireclay bricks for boiler have excellent characteristics as follows:

　　Good creep resistance

　　High bending strength

　　Low reheating linear change

　　Low thermal conductivity

　　Good heat-insulating property

　　Lightweight fireclay bricks as power plant boiler refractories mainly used for heat insulation wall building, because of light weight, low thermal conductivity and high refractoriness.