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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

Toxicology of Hafnium Oxide

Routes of Entry

Inhalation, skin, and ingestion.

Effects of Overexposure

  1. Inhalation

    2. May cause pulmonary irritation. Coughing or sneezing may occur.

  2. Dermal/Eye Contact

    3. May cause irritation, inflammation may occur.

  3. Ingestion

    4. 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.

Quebec039;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. Sax039;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

By Edouard Bastarache

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.

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