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Hafnium Oxide Toxicty


Identification :
 
Synonym: Hafnium Dioxide
Formula: HfO2
CAS # 12055-23-1
 
Source :
 
Hafnium (Hf) is found in association with zirconium ores, production based on zircon (ZrSiO4) concentrates which contain 0.5% to 2% hafnium. This metal has outstanding corrosion resistance accounting for some of its major applications.
 
Compounds used in Ceramics :
 
-Hafnium Boride,
-Hafnium Carbide,
-Hafnium Nitride,
-Hafnium Oxide,
-Hafnium Silicate,
-Hafnium Titanate.
 
Toxicology of Hafnium Oxide :
 
Routes of Entry :
 
Inhalation, skin, and ingestion.
 
Effects of Overexposure :
 
I-Inhalation :
May cause pulmonary irritation. Coughing or sneezing may occur.
 
II-Dermal/Eye Contact :
May cause irritation, inflammation may occur.
 
III-Ingestion :
Ingestion may cause some discomfort. Hafnium is considered relatively non-toxic due to poor absorption of it in the alimentary tract of mammals.
 
Chronic Exposure :
 
It may cause liver damage.
It may also cause a benign pneumoconiosis by dust accumulation, without fibrosis and ventilatory effect, and without special predisposition to tuberculosis and/or lung cancer as encountered in silicosis and abestosis.
 
Medical Conditions Generally Aggravated by Exposure :
 
Previous respiratory and eye disorders.
 
Carcinogenicity :
 
Hafnium oxide is not considered a carcinogen by official regulatory bodies.
  
Quebec's Exposure Limits :
 
VEMP : 0.5 mg/m³
 
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.R. last edition.
5-Chemical Hazards of the Workplace, Proctor & Hughes, 4th edition
 

Out Bound Links




Edouard Bastarache M.D.
Occupational & Environmental Medicine
Author of "Substitutions for Raw Ceramic Materials"
Tracy, Québec, CANADA

edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/




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