Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content

Tungsten

Synonyms & Trade Names
Tungsten metal, Wolfram
CAS No.
7440-33-7
RTECS No.
YO7175000
DOT ID & Guide
Formula
W
Conversion
IDLH
N.D.
See: IDLH INDEX
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 See Appendix G
Measurement Methods
NIOSH 7074 , 7300 , 7301;
OSHA ID213
See: NMAM or OSHA Methods
Physical Description
Hard, brittle, steel-gray to tin-white solid.
Molecular Weight
183.9
Boiling Point
10,701°F
Melting Point
6170°F
Solubility
Insoluble
Vapor Pressure
0 mmHg (approx)
Ionization Potential
NA
Specific Gravity
19.3
Flash Point
NA
Upper Exposive Limit
NA
Lower Explosive Limit
NA
Combustible in the form of finely divided powder; may ignite spontaneously.
Incompatibilities & Reactivities
Bromine trifluoride, chlorine trifluoride, fluorine, iodine pentafluoride
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
Personal Protection/Sanitation
(See protection codes)
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

See also
INTRODUCTION   ICSC CARD: 1404

Follow NIOSH

NIOSH Homepage

TOP