NIOSH Pocket Guide to Chemical Hazards

Uranium (insoluble compounds, as U)

CAS 7440-61-1 (metal)

U (metal)

RTECS YR3490000 (metal)
Synonyms & Trade Names
Uranium metal: Uranium I
Synonyms of other insoluble uranium compounds vary depending upon the specific compound.
DOT ID & Guide
2979 162 (metal, pyrophoric)


NIOSH REL: Ca TWA 0.2 mg/m3 ST 0.6 mg/m3 See Appendix A
OSHA PEL†: TWA 0.25 mg/m3
IDLH Ca [10 mg/m3 (as U)] See: 7440611 Conversion
Physical Description
Metal: Silver-white, malleable, ductile, lustrous solid. [Note: Weakly radioactive.]
MW: 238.0
BP: 6895°F
MLT: 2097°F
Sol: Insoluble
VP: 0 mmHg (approx)

Sp.Gr: 19.05 (metal)
Fl.P: NA
MEC: 60 g/m3
Metal: Combustible Solid, especially turnings and powder.
Incompatibilities & Reactivities
Carbon dioxide, carbon tetrachloride, nitric acid, fluorine [Note: Complete coverage of uranium metal scrap with oil is essential for prevention of fire.]
Measurement Methods
None available
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated/Daily
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations NIOSH
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Dermatitis; kidney damage; blood changes; [potential occupational carcinogen]; in animals: lung, lymph node damage [Potential for cancer is a result of alpha-emitting properties & radioactive decay products (e.g., radon).]
Target Organs Skin, kidneys, bone marrow, lymphatic system

Cancer Site [lung cancer]