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Tungsten Compounds Toxicology

Synonym : Wolfram

Compounds :
-Tungsten carbide,
-Tungsten sulfide,
-Tungsten carbonyl,
-Tungsten chloride,
-Tungsten fluoride,
-Tungsten oxychloride,
-Tungsten silicide,
-Tungsten oxide,
-Tungstic acid,
-Various tungstates.

Uses :
-In ferrous and nonferrous alloys,
-filaments in incandescent lamps,
-heating elements,
-welding electrodes,
-manufacture of abrasives and tools,
-manufacture of textiles and ceramics.

Tungsten Trioxide

Introduction :

CAS Number : 1314-35-8
Molecular Formula : WO3

I-Main Synonyms :

French Names :
Trioxyde de tungstene,
Trioxyde de tungstène.
English Names :
Tungsten trioxide,
Tungstic anhydride,
Tungstic oxide,
Tungstic acid,
Tungsten oxide.

II-Uses and Sources of Emission :
Manufacture of inorganic products,

Hygiene and safety :

I-Appearance :

II-Physical Properties :
Physical State : Solid
Odor : Odorless
Freezing/Melting Point :1473 deg C
Solubility : Insoluble in water
Specific Gravity/Density :7.1600

III-Inflammability and Explosiveness
This product is non flammable.

Prevention :

I-Reactivity :

Chemical Stability :
Stable under normal temperatures and pressures.
Conditions to Avoid :
Incompatible materials, dust generation.
Incompatibilities with Other Materials :
Chlorine, Chlorine trifluoride, Lithium.
Hazardous Decomposition Products :
Hazardous Polymerization :
Has not been reported.

II-Handling :
Wash thoroughly after handling. Use only in a well-ventilated area. Minimize dust generation and accumulation.
Keep container tightly closed.

III-Storage :
Store in a cool, dry, well-ventilated area away from incompatible substances.
Keep containers tightly closed.

IV-Accidental Release Measures :

General Information :
Use proper personal protective equipment.
Spills/Leaks :
Clean up spills immediately, wearing appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions.
Provide ventilation.

V-Waste Disposal :
Dispose according to local and state regulations.

Toxicology :

I-LD50 :
Oral, rat : LD50 = 1059 mg/kg.

II-Acute Effects :

Eyes :
May cause eye irritation.
Skin :
May cause skin irritation.
Ingestion :
May cause gastrointestinal irritation with nausea, vomiting and diarrhea.
May be harmful if swallowed.
Inhalation :
May cause respiratory tract irritation

III-Chronic Effects :
Prolonged or repeated skin contact may cause dermatitis.
May cause lung damage.

IV-Effects on development :
No data concerning antenatal development was found in the consulted documentary sources.

V-Effects on reproduction :
No data concerning reproduction was found in the consulted documentary sources.

VI-Effects on breast milk :
There is no data concerning its excretion or detection in milk.

VII-Mutagenicity :
No information found.

VIII-Carcinogenicity :
Not listed by ACGIH, IARC, NTP.

First Aid Measures :

I-Eyes :
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.
II-Skin :
Get medical aid. Flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
III-Ingestion :
Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
IV-Inhalation :
Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
V-Notes to Physician :
Treat symptomatically
VI-Antidote :
None reported.

Exposure Controls, Personal Protection :

I-Engineering Controls :
Use adequate general or local exhaust ventilation to keep airborne concentrations below the permissible exposure limits.
II-Personal Protective Equipment :
Eyes :
Wear appropriate protective eyeglasses or chemical safety goggles.
Skin :
Wear appropriate gloves to prevent skin exposure.
Clothing :
Wear appropriate protective clothing to minimize contact with skin.
Respirators :
Wear an approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.

Fire Fighting Measures :

I-General Information :
As in any fire, wear a self-contained breathing apparatus in pressure-demand, and full protective gear.
II-Extinguishing Media :
Use water fog, dry chemical, carbon dioxide, or regular foam.

Ecological Information :

I-Ecotoxicity :
No data available. No information available.
II-Environmental :
No information found.
III-Physical :
No information found.
IV-Other :
No information available.

Quebec's Exposure Limits :

Valeur d'Exposition Moyenne Pondérée (VEMP) : 5 mg/m³ expressed as W.

References :
1-Occupational Medicine,Carl Zenz, last edition.
2-Clinical Environmental Health and Toxic Exposures, Sullivan & Krieger; last edition.
3-Sax's Dangerous Properties of Industrial Materials, Lewis C., last edition.
4-Toxicologie Industrielle et Intoxications Professionnelles, Lauwerys R. last edition.
5-Chemical Hazards of the Workplace, Proctor & Hughes, 4th edition.
6-CSST-Quebec, Répertoite Toxicologique.
7- Fischer Scientific, MSDS, 2003.

By Edouard Bastarache

Related Information


Typecodes Article by Edouard Bastarache
Edouard Bastarache is a well known doctor that has written many articles on the subject of toxicity of ceramic materials and books on technical aspects of ceramics. He writes in both English and French.

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