NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

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. See: IDLH INDEX
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, 7301; OSHA ID213
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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 an N100, R100, or P100 filter (including N100, R100, and P100 filtering facepieces) except quarter-mask respirators. Click here for information on selection of N, R, or P filters.
(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 an N100, R100, or P100 filter (including N100, R100, and P100 filtering facepieces) except quarter-mask respirators. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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   See ICSC CARD: 1404