A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1-9
Yellow Iron Oxide
Key Data
Formula: FeO(OH).H2O or Fe(OH)3
CAS: 51274-00-1
Other names: Iron (III) hydroxide, hydrated iron oxide
Appearance: Lemon to dark yellow powder
Solubility in water: Insoluble
Thermal decomposition: Dehydrates to red iron oxide between 80 and 160°C
Oxidation:
Softening Point:
Melting Point: Not applicable due to thermal decomposition
Boiling Point:
Dustiness:
Composition/Impurities
Uses
Colourant for glazes
Radioactivity
Exposure Routes
Skin and Eye Exposure
No adverse effects
Skin Absorption
Not absorbed
Inhalation
The prolonged inhalation of high concentrations can produce a benign pneumoconiosis without impairment of lung morphology, function or symptoms. Although this may show up on lung X-rays, unlike silica this does not result in fibros or other damage to the lungs.
Particles are rods about 1.6µm long but with the diameter mostly below 0.1µm.
Ingestion
Only about 2% of ingested yellow iron oxide is absorbed by the digestive system (though this increases markedly with ascorbic acid - Vitamin C).
Toxicity
There are very few toxicity tests on this material, but also there are no known toxicity reports other than from the generic dust hazards.
Results from red iron oxide should not be read across, due to the much higher proportion of nanoparticles in the yellow oxide.
Acute
Skin
Inhalation
Ingestion
Repeat Dose
Skin
Inhalation
Ingestion
Genotoxicity
The material is not reported to have any genotoxicity.
Carcinogenicity
The material is not reported to be a carcinogen.
Reproductive Toxicity
There is no data on effects on fertility, reproductive toxicity or effects on or via lactation.
Fire Hazard
Health and Safety Practice
Normal dust precautions.
Disposal
Normal waste disposal. Not harmful to aquatic life.
Regulatory Requirements
None
Dust Limits
| Regulator | 8hr TWA mg/m³ | 15 min TWA mg/m³ | Notes |
| UK HSE | 5 | 10 | Iron oxide fume (as Fe) |
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