Cobalt dihydroxide

CAS Number
21041-93-0
EC Number
244-166-4

What is Cobalt dihydroxide?

Cobalt dihydroxide (CAS 21041-93-0), also sold as cobaltous hydroxide, is an inorganic cobalt compound used as a precursor and catalyst intermediate in battery materials, pigments and specialty chemicals.

Where is Cobalt dihydroxide used?

  • Battery materials: direct precursor to cobalt oxide and lithium cobalt oxide cathode materials
  • Ceramics and glass: introduces cobalt-based blue pigments into frits and glazes
  • Catalysis: starting material for supported cobalt catalysts in hydroprocessing and Fischer-Tropsch synthesis
  • Specialty chemicals: reactive intermediate for synthesizing cobalt salts such as cobalt naphthenate or cobalt acetate
  • It converts into higher-value cobalt compounds through controlled thermal or chemical processing.

Commercial specifications

  • Fine powder, varying particle size distributions
  • Technical grade standard; high-purity grades for battery and catalyst applications with tightly controlled trace metal limits
  • Packaging from small drums to bulk quantities

Other Names (Synonyms)

COBALT HYDROXIDE|Cobaltous hydroxide|Cobalt(2+) hydroxide|51B9AYG60K|COBALTOUS HYDROXIDE [MI]|RefChem:127211|Cobalt hydroxide (Co(OH)2)|Cobalt(II) hydroxide

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What are the physical properties of Cobalt dihydroxide?

Melting Point °Cd ec.)
Density 3.59 g/cm³
Appearance Rose-red powder.Soluble in acids and ammonium salt solutions; insoluble in water and alkalies.
Color Pink to purple
Form Powder
Water Solubility Soluble in acids and ammonia. Very slightly soluble in water. Insoluble in dilute alkalis.
Vapor Pressure 0Pa@20°C
pH 9.15(1 mM solution);9.15(10 mM solution);9.15(100 mM solution)

How is Cobalt dihydroxide classified and handled safely? Learn More

Danger
GHS06· Toxic GHS08· Health Hazard

Hazard Statements

H302 H302
H317 H317
H319 H319
H330 H330
H334 H334
H372 H372

Precautionary Statements

P203 P203
P233 P233
P260 P260
P261 P261

Which trade and regulatory codes apply to Cobalt dihydroxide?

UN Number 3077
ADR Class 9
Packing Group III
WGK (Germany) 3
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