Calcium chloride, a salt of chlorine and calcium, of the formula CaCl2. It is a typical ionic halide and is a white solid at room temperature. Its common applications include brine used in refrigeration equipment, road melting agents and desiccants. Because it is easy to absorb moisture in the air deliquescence, so anhydrous calcium chloride must be sealed in the container storage. Calcium chloride and its hydrates and solutions have important application value in food manufacturing, building materials, medicine and biology.