Ferric Oxide Hydrate CAS No. 12259-21-1

Names and Identifiers

Name	Ferric oxide hydrate
Synonyms	Ferrox UNII-EX438O2MRT IRON OXIDE YELLOW Ironoxide,hydrate Hydrous ferric oxide Ferric oxide hydrate Hydrated ferric oxide FERRIC OXIDE HYDRATE) diirontrioxidehydrate IRON(III) OXIDE HYDRATE Iron oxide (Fe203), hydrate IRON(III) OXIDE MONOHYDRATE Iron oxide (Fe2O3), hydrate diferric oxygen(-2) anion hydrate
CAS	12259-21-1
InChI	InChI=1/2Fe.H2O.3O/h;;1H2;;;/q2*+3;;3*-2

​Physico-chemical Properties

Molecular Formula	Fe2H2O4
Molar Mass	177.7
Density	1.80 g/cm3
Boling Point	100°C at 760 mmHg
Vapor Presure	24.5mmHg at 25°C

​Ferric Oxide Hydrate (Iron(III) Oxide Hydroxide)

CAS No.: 12259-21-1
EC No.: 215-168-2
Appearance: Black pieces.

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​Specifications

​Molecular Formula: FeO(OH) (commonly represented as hydrated iron oxide, e.g., Fe₂O₃·nH₂O)​Molecular Weight: 177.70 g/mol​Boiling Point: ~125 °C (decomposition, releases water)​Melting Point: ~1538 °C (anhydrous Fe₂O₃; hydrate decomposes before melting)​Density: 5.24 g/cm³​Flash Point: >230 °F (>110 °C)​Storage: 2–8 °C (to prevent dehydration)​Color: Black

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​Key Applications

​Pigments & Coatings:Used for ​coloring paints, rubber, plastics, and construction materials (e.g., concrete, bricks).Acts as a ​UV-resistant pigment in industrial coatings.​Industrial Catalysts & Polishing:Employed as a ​catalyst in chemical reactions and a ​polishing agent for metals and glass.​Magnetic Materials:Utilized in ​magnetic storage media and electronic components.​Environmental & Chemical Processes:Functions as a ​reducing agent and ​adsorbent in wastewater treatment.

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​Note on Discrepancies

​Molecular Formula: The provided formula (H₂Fe₂O₄) likely refers to a hydrated form, better represented as ​FeO(OH) or ​Fe₂O₃·nH₂O.​Melting Point: The listed 1538 °C corresponds to ​anhydrous Fe₂O₃; the hydrate decomposes at lower temperatures.​General Use Descriptions: The original text includes generic applications of chemicals in cosmetics and coatings (e.g., preservatives, solvents) that are ​not specific to ferric oxide hydrate. The above applications are tailored to its actual uses.

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​Storage & Handling

Store in a ​cool, dry environment (2–8 °C) to prevent dehydration.Avoid exposure to high temperatures and moisture.

Summary:
Ferric oxide hydrate is a ​versatile industrial compound valued for its pigment properties, catalytic activity, and role in magnetic materials. Its ​high density and ​thermal stability (as anhydrous Fe₂O₃) make it suitable for demanding applications, while proper storage ensures stability.

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