NIOSH Pocket Guide to Chemical Hazards

Tungsten CAS 7440-33-7
W RTECS YO7175000
Synonyms & Trade Names
Tungsten metal, Wolfram
DOT ID & Guide
Exposure
Limits
NIOSH REL*: TWA 5 mg/m3 ST 10 mg/m3 [*Note: The REL also applies to other insoluble tungsten compounds (as W).]
OSHA PEL�: none
IDLH N.D. Conversion
Physical Description
Hard, brittle, steel-gray to tin-white solid.
MW: 183.9
BP: 10,701°F
MLT: 6170°F
Sol: Insoluble
VP: 0 mmHg (approx)
IP: NA

Sp.Gr: 19.3
Fl.P: NA
UEL: NA
LEL: NA

Combustible in the form of finely divided powder; may ignite spontaneously.
Incompatibilities & Reactivities
Bromine trifluoride, chlorine trifluoride, fluorine, iodine pentafluoride
Measurement Methods
NIOSH 7074, 7300; OSHA ID213
Personal Protection & Sanitation
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash
Breathing: Fresh air
Swallow: Medical attention immediately
Respirator Recommendations NIOSH
Up to 50 mg/m3: (APF = 10) Any air-purifying respirator with a high-efficiency particulate filter/(APF = 10) Any supplied-air respirator/(APF = 50) Any self-contained breathing apparatus with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions: (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
Escape: (APF = 10) Any air-purifying respirator with a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, respiratory system; diffuse pulmonary fibrosis; loss of appetite, nausea, cough; blood changes
Target Organs Eyes, skin, respiratory system, blood
See also: INTRODUCTION