- Summary,
French
version
-
- On this page :
Hafnium oxide by Edouard Bastarache, Oxyde
d'hafnium par Édouard
Bastarache
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HAFNIUM
Oxide
by
Edouard Bastarache
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- 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
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- References
:
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- 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
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- Edouard
Bastarache M.D.
- (Occupational
& Environmental
Medicine)
-
- Author
of " Substitutions for raw ceramic
materials "
- Tracy,
Québec, CANADA
- edouardb@colba.net
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