NIOSH Pocket Guide to Chemical Hazards

Cobalt hydrocarbonyl (as Co) CAS 16842-03-8
HCo(CO)4 RTECS GG0900000
Synonyms & Trade Names
Hydrocobalt tetracarbonyl, Tetracarbonylhydridocobalt, Tetracarbonylhydrocobalt
DOT ID & Guide
NIOSH REL: TWA 0.1 mg/m3
OSHA PEL†: none
IDLH N.D. Conversion
Physical Description
Gas with an offensive odor.
MW: 172.0
BP: ?
FRZ: -15°F
Sol: 0.05%
VP: >1 atm
IP: ?
RGasD: 5.93

Fl.P: NA (Gas)
UEL: ?
LEL: ?

Flammable Gas
Incompatibilities & Reactivities
Air [Note: Unstable gas that decomposes rapidly in air at room temperature to cobalt carbonyl & hydrogen.]
Measurement Methods
None available
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash
Breathing: Respiratory support

Respirator Recommendations To be added later
Exposure Routes inhalation, skin and/or eye contact
Symptoms In animals: irritation respiratory system; dyspnea (breathing difficulty), cough, decreased pulmonary function, pulmonary edema
Target Organs Eyes, skin, respiratory system