Deslagging Agen includes two kinds: Casting steel using and casting iron using. The main ingredients are SiO2, Al2O3, Rapidly heated to above 1100 ° C, Volume instant expands and forms the sticky active material with a porous structure, which can paste the slag and impurity in the molten iron and molten steel together, playing the role of slag accretion. This slag remover do not burst and splash, can prevent solution oxidation, and can be used as insulation materials and stop slag materials to reduce casting slag inclusion defect, which helps to prevent the casting appear slag, stoma defects, improve casting yield and realize no slag casting, covering insulation, energy saving and environmental protection.