HD calcium silicate is a kind of non-combustible a grade material with stable physical and chemical properties. The characteristics are non-toxic, non- asbestos, high temperature and pressured resistance, good performance of fire-proof and insulation and arbitrary processing. It dose not deform in normal temperature or moist air. Free from asbestos, is a kind of green building material, havent any irritant smoke when burning and high temperature. This kind of material had already widely used as the cores of fire-proof and sound insulation door, machinery facilities, floorboard in various field.