Cobalt(II) oxide

CAS: 1307-96-6

Overview

Cobalt(II) oxide (CAS 1307-96-6 ), commonly referenced as CoO, is an inorganic mineral compound used primarily as a colorant and chemical intermediate across ceramics, coatings, and specialty materials manufacturing.

It delivers a characteristic blue-to-black coloration and acts as a reactive precursor in high-temperature processing applications. In ceramic glazes and glass manufacturing, CoO functions as a flux-active colorant.

This compound produces stable blue tones that withstand firing temperatures where organic pigments fail. Coatings formulators incorporate it as a drier catalyst and pigment component in industrial paints.

It is particularly useful where long-term color stability under heat or UV exposure is required. The textile and leather industries use cobalt oxide as a mordant-adjacent agent to improve dye fixation.

This application ensures surface uniformity on treated substrates. In specialty adhesives and sealants, it contributes to oxidative curing acceleration, shortening set times in oil-based formulations.

Cobalt(II) oxide is supplied as a fine powder in varying particle size distributions suited to different processing requirements. Technical and pigment-grade specifications are the most commercially available.

Purity levels typically range from 72% to over 99% cobalt oxide content. Bulk quantities are standard for industrial buyers, with smaller packaging available for laboratory and formulation development use.

Physical Properties

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

Safety & Handling

Warning GHS08 GHS06 GHS07 GHS09 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 H351 Suspected of causing cancer H370 Causes damage to organs H371 May cause damage to organs H372 Causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects 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. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P316 Get emergency medical help immediately. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P320 Specific treatment is urgent (see … on this label). P321 Specific treatment (see … on this label). P330 Rinse mouth. P391 Collect spillage. P403 Store in a well-ventilated place. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P301+P316 Get emergency medical help immediately. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P333+P317 Get emergency medical help. P342+P316 Get emergency medical help immediately. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed.

Trade & Regulatory

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

Other Names

Cobalt oxide | Cobalt oxide (coo) | Oxocobalt | CoO

Industries

Pulp & Paper Textile, Leather & Paper Coatings, Adhesives, Sealants & Elastomers Personal Care & Cosmetics