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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,
colourant.

Hygiene and safety :

I-Appearance :
Yellow.

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
Inflammability:
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 :
None.
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.

Related Information

Links

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.
People Edouard Bastarache

By Edouard Bastarache


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