Calcium Chloride is an ionic compound of calcium and chlorine with the chemical formula CaCl2 and CAS 10043-52-4. At room temperature, it is a colorless crystalline solid that is highly soluble in water. Calcium chloride is used in industry as a de-icer, in road surfacing to suppress the formation of dust, in water treatment to increase the hardness of water in swimming pools, and as an additive in plastics and fire extinguishers.
Calcium Chloride is available for shipping throughout the continental United States with a one-to-two week lead time, subject to availability. It is supplied as a dry white powder or flake packed in 25 kg bags; liquid solution and special packaging may be available on request. Contact The Chemical Company for current pricing, packaging options, lead times, and supply chain updates.
The Chemical Company’s Calcium Chloride (CaCl₂) is an ionic compound of calcium and chlorine that appears as a white to off-white crystalline solid, flake, or powder. It is odorless, highly hygroscopic, and deliquescent — meaning it will absorb enough atmospheric moisture to eventually dissolve into a concentrated brine solution. In the United States, most calcium chloride is obtained by purification of naturally occurring brine deposits, while significant quantities are also produced as a byproduct of the Solvay process and from the reaction of limestone with hydrochloric acid.
One of the most widely applied inorganic salts in the world, Calcium Chloride is valued for six key properties: hygroscopicity, exothermic dissolution, freezing point depression, high solubility, high solution density, and reactivity as a calcium and chloride ion source. These properties drive its use across de-icing, desiccation, food processing, oil and gas drilling, concrete acceleration, water treatment, and refrigeration. TCC supplies calcium chloride in anhydrous, dihydrate, and liquid solution forms across technical and food-grade specifications.
Calcium Chloride outperforms sodium chloride as a de-icing agent on two fronts: its dissolution is exothermic — actively generating heat that melts ice on contact — and it depresses the freezing point of water to -52°C (-62°F) at eutectic concentration, versus only -21°C (-6°F) for rock salt. It carries E-number E509 and is GRAS-listed by the FDA, with food-grade uses spanning vegetable firming, tofu coagulation, cheesemaking, and brewing water adjustment.
The ionic compound is highly toxic, harmful if swallowed, causes serious eye damage, and exposure may cause respiratory irritation. It is not combustible but gives off irritating or toxic fumes or gases in a fire. Because of its hygroscopic nature, the hazardous compound must be kept in tightly-sealed containers.
| Property | Value |
| Molecular Formula | CaCl₂ |
| Molecular Weight | 110.98 g/mol (anhydrous) |
| Appearance | White crystalline solid, powder, flake, or granule |
| Odor | Odorless |
| Density (anhydrous) | 2.15 g/cm³ |
| Density (dihydrate) | 1.85 g/cm³ |
| Melting Point (anhydrous) | 772°C (1422°F) |
| Boiling Point (anhydrous) | 1,935°C (3,515°F) |
| Solubility in Water | 74.5 g/100 mL at 20°C; 159 g/100 mL at 100°C (anhydrous) |
| Heat of Dissolution | -82.8 kJ/mol (exothermic; solution heats significantly on dissolution) |
| Eutectic Point | 29.8 wt% CaCl₂; freezing point -51.7°C (-61°F) |
| Freezing Point Depression | Effective to -52°C vs. -21°C for NaCl |
| Hygroscopicity | Absorbs moisture above 42% relative humidity; deliquescent |
| Available Hydrate Forms | Anhydrous (CaCl₂), Monohydrate, Dihydrate (most common), Tetrahydrate, Hexahydrate |
| Liquid Solution Density | 8.32–11.97 lbs/gal depending on concentration |
| pH (aqueous solution) | Slightly alkaline to neutral (~6.5–8.5) |
| Incompatibilities | Soluble carbonates, phosphates, sulfates, tartrates; bromine trifluoride; zinc (moisture) |
| Food Additive Status | E509; GRAS (FDA); included in FDA Inactive Ingredients Database |
| Available Grades | Technical, Food Grade (FCC), USP/NF, Anhydrous, Dihydrate, Liquid Solution (29–40%) |
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