Calcium chloride, CaCl2 patent, 2 H20 white crystal or block. Melting point 782 ℃ 1600 ℃, boiling point, density 2.15 g / 3 cm (25 ℃). The solubility of calcium chloride in the water is very big, 0 ℃ 100 g water can dissolve when 59.5 grams of calcium chloride, 100 ℃, 159 when dissolved. Can form with 1, 2, 4, 6 of hydrate gesso, colorless cubic crystals, white or grey, granular, cellular block, round shape, irregular granular, powder. Non-toxic, odourless, taste the pain. The relative density of 2.15 (25 ℃). Melting point 782 ℃. Boiling point more than 1600 ℃.