General merchandise for the white, off-white or slightly yellow solid sheet or block, bitter taste and Shibuya. Density 0.835g/cm3. Soluble in water, soluble in alcohol, insoluble in ether. Its aqueous solution was neutral or slightly alkaline. Is corrosive. When heated to 260 ℃ water into a complex dehydration. Strong deliquescence. Alkali by the ammonia production of the rule of law ash distillation waste (including calcium chloride 100g / L), after purification, clarification, evaporation, separation of sodium chloride, it will clarify the mother liquor and continue to concentrate, when calcium chloride content of 70% when a cooling system. Can also be used hydrochloric acid and reaction of limestone powder. Used as refrigerants, antifreeze, fire extinguishing agent for use in melting ice and snow melt, manufacturing anhydrous calcium chloride, the flame retardant cotton fabrics, rubber agent condensate production. Can accelerate the hardening of concrete and mortar building to increase the capacity of the cold, but also for the elimination of port and road dust aerosol agent. Industrial grade calcium chloride dihydrate by the saturated solution, adding decolorizing agent, with the exception of heavy metal agent, with the exception of arsenic to solution purification, filtration to remove impurities, the filtrate on cooling crystallization, solid-liquid separation, drying can be obtained-class products for human consumption. Used as a coagulant of canned food and soy products, calcium fortifier.