Cobalt Chloride Hexahydrate

Molecular formula: CoCl2•6H2O

Molecular weight: 237.93

CAS: 7791-13-1


Pink or mauve crystal belonging to monoclinic system, density: 1.924g/cm3, melting point: 86°C, stable under room temperature. It turns blue when heated and turns red in the moist air by cooling. Freely soluble in water, alcohol, aether, acetone and glycerin. It changes into anhydride (blue power) when the crystal water is lost.


Used in producing barometrograph, gravimeter in instruments manufacturing industries, paint drier in coating industry, gas defense mask in national defence industry, sympathetic ink, cobalt chloride test paper, allochroic silicagel and nitrogen absorbent. Collocated the feedstuff in stockbreeding, and the material of medicament.


Stored in cool and dry warehouse; Keep away from flame and heat.

NO Item Specification
1 Co ≤24%
2 Fe ≤0.001%
3 Ni ≤0.001%
4 Zn ≤0.001%
5 Ca ≤0.001%
6 Cu ≤0.001%
7 Mn ≤0.001%
8 Mg ≤0.001%
9 Na ≤0.001%
10 Water insoluble matter ≤0.02%


Packaging Sizes

25kg net. Double plastic bags lined plastic woven sack.


1) Used in electroplating, as glass and ceramic colorant, paint drier. Manufacture of cobalt catalysts, manufacture of color-changing silica gel wet and dry indicators. Creates Visible Ink. Used as beer foam stabilizer.
2) Used as analytical reagent, moderate and moisture indicator, ammonia absorbent. For medium preparation, catalyst preparation.
3) Used as feed nutrition enhancer. Cobalt participates in the synthesis of vitamin B12, activates biological enzymes, and resists aplastic anemia.
4) It is used to configure compound feed in animal husbandry as a cobalt supplement. It is used in the manufacture of instruments to produce barometers, hydrometers, dry and wet indicators, etc. The ceramic industry is used as a colorant. The paint industry is used to make paint drier.
5) Used in tin-cobalt alloy and cobalt-nickel-phosphorus alloy electrolytes, and can also be used as an additive for galvanizing, electroless cobalt and cobalt alloys, etc.

Security Information?

Bronchial asthma sometimes occurs after the inhalation of cobalt chloride dust. For sensitive individuals, inhalation of cobalt chloride dust can cause pulmonary obstructive lesions and symptoms such as shortness of breath. Dust is irritating to eyes, and long-term exposure can cause eye damage. If 500mg of cobalt chloride enters the body within a day, it will cause loss of appetite, vomiting, diarrhea, and redness of the face and limbs. Grinding of cobalt chloride can cause acute dermatitis with a large number of divergent red papules and nodules and edema; sometimes ulcers form on the surface. Ingestion of large amounts can cause acute poisoning, causing damage to the blood, thyroid and pancreas.


The aqueous solution of this product turns blue when heated or added with concentrated hydrochloric acid, chloride or organic solvent. Boiling the aqueous solution, and then adding ammonia water will generate the basic salt of cobalt chloride. The solution is also blue when exposed to light. At 30-35 °C, the crystallization begins to weather and become turbid, and at 45-50 °C for 4 hours, it almost completely turns into cobalt chloride tetrahydrate. When heated to 110-120°C, it completely loses 6 crystal waters and turns into anhydrous cobalt chloride which is poisonous.

Handling and storage?

Handling Precautions: Airtight operation, enhanced ventilation. Operators must undergo special training and strictly abide by the operating procedures. It is recommended that operators wear self-priming filter dust masks, chemical safety goggles, anti-poison infiltration overalls, and rubber gloves. Avoid generating dust. Avoid contact with alkali metals. When handling, load and unload lightly to prevent damage to packaging and containers. Equipped with leakage emergency treatment equipment. Empty containers may contain hazardous residues.
Storage Precautions: Store in a cool, ventilated warehouse. Keep away from fire and heat sources. This product should be stored separately from alkali metals and food chemicals, and should not be stored together. Storage areas should be equipped with suitable materials to contain spills.

The emergency measures?

Skin contact: Take off contaminated clothing and rinse with plenty of running water.
Inhalation: Get away from the scene to fresh air. If breathing is difficult, give oxygen. Seek medical attention.
Ingestion: Drink plenty of warm water, induce vomiting. Gastric lavage, catharsis. Seek medical attention.