Salts & Minerals
REACH
Cobalt(II) oxide
CAS Number
1307-96-6
EC Number
215-154-6
Abbreviation
CoO
What is Cobalt(II) oxide?
Cobalt(II) oxide (CAS 1307-96-6), commonly referenced as CoO, is an inorganic mineral compound used primarily as a colorant and chemical intermediate in ceramics, coatings, and specialty materials manufacturing.
Where is Cobalt(II) oxide used?
- Ceramic glazes and glass: flux-active colorant producing stable blue tones that withstand firing temperatures
- Coatings: drier catalyst and pigment component in industrial paints
- Textile and leather: mordant-adjacent agent improving dye fixation
- In specialty adhesives and sealants it accelerates oxidative curing, shortening set times in oil-based formulations.
Commercial specifications
- Purity typically 72% to over 99% cobalt oxide content
- Fine powder in varying particle size distributions
- Bulk quantities standard; smaller packaging for laboratory and formulation development
Other Names (Synonyms)
Cobalt oxide|Cobalt oxide (coo)|Oxocobalt|CoO
What are the physical properties of Cobalt(II) oxide?
Melting Point ~1935 °C (approx)
Density 6.44 g/cm³
Appearance Black powder
Color Green-brown
Form Powder
Water Solubility insoluble
Vapor Pressure 0Pa@20°C
How is Cobalt(II) oxide classified and handled safely? Learn More
Warning
GHS08· Health Hazard GHS06· Toxic GHS07· Irritant GHS09· Environmental Hazard
Hazard Statements
H301 Toxic if swallowed
H317 May cause an allergic skin reaction
H330 Fatal if inhaled
H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P233 Keep container tightly closed.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
Which trade and regulatory codes apply to Cobalt(II) oxide?
HS Code 28220000
UN Number 3288
ADR Class 6.1
Packing Group III
Storage Class 6.1A - Combustible acute toxic Cat. 1 and 2
very toxic hazardous materials
WGK (Germany) 3