Calcium chloride

Calcium chloride

74% and 77% calcium chloride dihydrate, 94% anhydrous calcium chloride

Anhydrous calcium chloride generally refers to calcium chloride.

Calcium chloride, a salt composed of chlorine and calcium, has the chemical formula CaCl2. Slightly bitter. It is a typical ionic halide, white, hard pieces or particles at room temperature. Its common applications include brine used in refrigeration equipment, road ice melting agents and desiccants. Because it easily absorbs moisture in the air and deliquesces [5], anhydrous calcium chloride must be sealed and stored in a container. Calcium chloride and its hydrates and solutions have important applications in food manufacturing, building materials, medicine and biology. Calcium chloride has outstanding adsorption capacity for ammonia and low desorption temperature, and has great application prospects in the adsorption and separation of synthetic ammonia. However, because calcium chloride is not easy to form a stable porous material, its contact area with gaseous ammonia is small, and it is easy to swell and agglomerate in the process of adsorption and desorption, so it is difficult to put it into practical application in this area. Carrying calcium chloride on a carrier with a high specific surface area can greatly increase the contact area between calcium chloride and gas ammonia. Related studies have shown that the composite adsorbent prepared by loading calcium chloride on a molecular sieve has better adsorption performance and stability than a single adsorbent.

【Basic information】

Chinese name

Calcium chloride

English name

Calcium chloride


Anhydrous calcium chloride

Chemical formula


Molecular weight


Water soluble

Easily soluble in water, exothermic when dissolved

CAS Registry Number


EINECS registration number


Melting point



2.15 g/mL at 25 ℃

【Physical Properties】

Colorless cubic crystals, white or off-white, granular, honeycomb block, spherical, irregular granular, powder. Slightly toxic, odorless, slightly bitter taste. It is highly hygroscopic and easily deliquescent when exposed to the air. It is easily soluble in water and emits a lot of heat (the dissolution enthalpy of calcium chloride is -176.2cal/g), and its aqueous solution is slightly acidic. Soluble in alcohol, acetone and acetic acid. It reacts with ammonia or ethanol to generate CaCl2·8NH3 and CaCl2·4C2H5OH complexes respectively. At low temperature, the solution crystallizes and precipitates as hexahydrate. When it is gradually heated to 30℃, it will dissolve in its own crystal water. Continue heating and gradually lose water. When it reaches 200℃, it will become dihydrate. When heated to 260℃, it will become White porous anhydrous calcium chloride.

【Main application】

Industrial applications

1. Used as a multi-purpose desiccant, such as drying of nitrogen, oxygen, hydrogen, hydrogen chloride, sulfur dioxide and other gases. Used as a dehydrating agent in the production of alcohols, esters, ethers and acrylic resins. Calcium chloride aqueous solution is an important refrigerant for refrigerators and ice making. It can accelerate the hardening of concrete and increase the cold resistance of construction mortar. It is an excellent construction antifreeze. Used as an anti-fogging agent in ports, dust collectors on roads, and fabric fire retardants. Used as a protective and refining agent for aluminum and magnesium metallurgy. It is a precipitant for the production of lake pigments. Used for waste paper processing and deinking. It is the raw material for the production of calcium salt.

2. Chelating agent; curing agent; calcium enhancer; refrigerant for freezing; desiccant; anticaking agent; microbial inhibitor; pickling agent; tissue improver.

3. Used as a desiccant, road dust collector, antifogging agent, fabric fire retardant, food preservative and used to make calcium salt

4. Used as lubricant additive

5. Used as analytical reagent

6. Mainly used for diagnosis and treatment of tetany, urticaria, exudative edema, intestinal and ureteric colic, magnesium poisoning, etc. caused by blood calcium reduction

7. Used as calcium fortifier, curing agent, chelating agent and desiccant in the food industry.

8. It can increase the permeability of the cell wall.


Risk overview

Entry route: dust inhalation, ingestion

Health hazards: Dust can burn, irritate the nasal cavity, mouth, and throat, and can also cause nose bleeding and damage the nasal tissue; dry powder can irritate, and the solution can cause severe irritation and even burns

Contact: Take off contaminated clothing and rinse with plenty of running water.

Eye contact: Lift the eyelid and rinse with running water or normal saline. Seek medical attention.

Inhalation: Leave the scene to fresh air. If breathing is difficult, give oxygen. Seek medical attention.

Ingestion: Drink enough warm water to induce vomiting. Seek medical attention.

Diagnosis and treatment of hypercalcemia caused by injection: cardiac arrest.

Emergency treatment

Isolate the contaminated area and restrict access. Avoid dust, sweep it up carefully, put it in a bag and transfer it to a place or transport it to a waste disposal site for disposal.

Operation precautions

Closed operation, strengthen ventilation. Operators must undergo special training and strictly abide by operating procedures. It is recommended that operators wear self-priming filter dust masks to avoid generating dust. When handling, load and unload with care to prevent damage to packaging and containers.

Precautions for storage

Store in a cool, ventilated warehouse. The packaging container must be sealed to prevent moisture. Stack separately from deliquescent items.


Calcium chloride is irritating because it can dehydrate moist skin. When solid anhydrous calcium chloride is dissolved, it will release a lot of heat. If it is accidentally ingested, it can cause the mouth and esophagus~. Ingestion of concentrated solutions or solids of calcium chloride can cause gastrointestinal irritation or ulcers.

Risk term

R20 Harmful if inhaled.

R21 is harmful in contact with ~.

R37 Irritates the respiratory system.

R38 stimulation~.

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