It is a cement-based dry mix material specifically designed for prefabricated building node sealing, equipment installation cushion layer, and structural reinforcement. It is composed of high-strength fine aggregates, composite expansion agents, water reducing agents, and other external composite materials. After mixing with water, it has thixotropy, plasticity, hardening, and good water retention. It has the characteristics of early strength, high strength, slight expansion, no shrinkage, and good workability.