It is widely used in all kinds of thermal kilns. According to different grades, the products are made of high-quality artificial synthetic materials such as high-alumina sandy soil, corundum, silicon carbide, etc. and are combined with various admixtures, superplasticizers and flowing agents. The flowability of the material is improved. Its main feature is that without increasing water consumption, it only relies on the self-weight and potential energy difference of the material itself to generate flow. Under the condition of non-vibration, it can be constructed in places where cracks and vibration can not be tampered. It has very good construction quality. It is mainly used in parts where lining of CFB and other thermal equipment is difficult to construct and where serious erosion and wear occur.