PRODUCT Properties
| Melting point: | 1495°C |
| Boiling point: | 2900 °C (lit.) |
| Density | 8.9 g/mL at 25 °C (lit.) |
| vapor pressure | 0Pa at 20℃ |
| storage temp. | no restrictions. |
| solubility | H2O: soluble |
| form | wire |
| color | Pink to red to violet |
| Specific Gravity | 8.9 |
| Resistivity | 6.24 μΩ-cm, 20°C |
| Water Solubility | insoluble |
| Merck | 13,2452 |
| Exposure limits | TLV-TWA 0.05 mg as Co/m3 (ACGIH) PEL-TWA: 0.05 mg as Co/m3 (NIOSH, OSHA) TLV-STEL 0.1 mg as Co/m3 (ACGIH) IDLH 20 mg as Co/m3 (NIOSH) . |
| Stability: | Stable, but pyrophoric in air when finely divided. Incompatible with acetylene, hydrazinium nitrate, oxidizing agents, acids. |
Description and Uses
Cobalt was discovered by George Brandt in 1737. Cobalt exists in valence states from 0 to 5, with the most stable (+2 and +3) being the most common. Although there is only one stable isotope of cobalt, there are a number of unstable isotopes. Two of these, cobalt-60 and cobalt-57, are in use commercially. Cobalt-60 is used for cancer treatment and food irradiation. Cobalt-57 has research applications.
Cobalt is used in steel alloys, cementedcarbide abrasives and jet engines.
Safety
| Symbol(GHS) |   GHS07,GHS08 |
| Signal word | Danger |
| Hazard statements | H302-H317-H319-H334-H341-H350-H360F-H412 |
| Precautionary statements | P273-P280-P301+P312-P302+P352-P305+P351+P338-P308+P313 |
| Hazard Codes | T,Xn,F |
| Risk Statements | 45-23/24/25-34-53-42/43-40-36/37-36/38-17-11-15 |
| Safety Statements | 53-23-26-36/37/39-45-61-37-24-22-36/37-5-43 |
| RIDADR | UN 3264 8/PG 3 |
| OEB | D |
| OEL | TWA: 0.05 mg/m3 |
| WGK Germany | 3 |
| RTECS | GF8750000 |
| TSCA | Yes |
| HS Code | 8105 20 00 |
| HazardClass | 4.1 |
| PackingGroup | III |
| Toxicity | LD50 orally in Rabbit: 6170 mg/kg |
| IDLA | 20 mg Co/m3 |