Calcium chloride, composed of chlorine and calcium, the chemical formula is CaCl2. It is a typical ionic halide with a white solid at room temperature. Used in refrigeration equipment used in brine, road ice melting agent and desiccant. Because it is easy to absorb water in the air moisture, so anhydrous calcium chloride should be sealed in the container storage. Calcium chloride and its hydrate and solution have important application value in food manufacture, building materials, medicine and biology.