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Oxides and peroxides

Ferrous oxide

Also known as Iron oxide (FeO), CI 77489, C.I. 77489

CAS 1345-25-1Formula FeOMolar mass 71.84 g/molEC 215-721-8
11 suppliers listed
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Ferrous oxide chemical structure, FeO, CAS 1345-25-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Black cubic crystals
Melting point
1,377 °C
Density
6.0 g/cm³
Solubility
Practically insol in water and alkalies, readily sol in acids
HS code
282110
Category
Oxides and peroxides
Illustrative photo, black powder in an open woven sack in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Ferrous oxide?

Plain description, key identifiers and synonyms

Ferrous oxide is a chemical substance with the molecular formula FeO and a molar mass of 71.84 g/mol. Its CAS registry number is 1345-25-1. The IUPAC name is iron(2+), oxygen(2-).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
iron(2+), oxygen(2-)
CAS number
1345-25-1 CAS number cross-checked
EC number
215-721-8
Molecular formula
FeO
UNII
G7036X8B5H
INCI name
CI 77489
InChIKey
VBMVTYDPPZVILR-UHFFFAOYSA-N
InChI
InChI=1S/Fe.O/q+2;-2
SMILES (canonical and isomeric)
[O-2].[Fe+2]

Synonyms

  • Iron oxide (FeO)
  • CI 77489
  • C.I. 77489
  • IRON (II) OXIDE
  • Iron monooxide
  • Iron monoxide
  • Iron(II) oxide
  • Natural wuestite

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Black cubic crystalsexp.
Melting point
1,377 °Cexp.
Density
6.0 g/cm³exp.
Solubility
Practically insol in water and alkalies, readily sol in acidsexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
71.84 g/molcalc.
Exact mass
71.9299 Dacalc.
LogP (octanol/water)
-0.12calc.
Topological polar surface area
28.5 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
2calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Ferrous oxide suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 11 suppliers
11 of 11 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

11 suppliers in 5 countries

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Ferrous oxide price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

In manufacture of green, heat-absorbing glass, in steel manufacture, in enamels, as catalyst.

Iron oxide pigments are widely used to provide color, hiding power, and/or reinforcement in paints, coatings, construction materials, plastics, paper, glass, ceramics, and rubber goods. In addition iron oxides are used as catalysts in chemical processing and as the source of micronutrient iron in animal feeds and fertilizers. Specialized iron oxides of high purity and controlled uniformity are ued in the manufacture of ferrites (ceramic magnets) which have application in computer memory cores, hi-fi speakers, color TV, and other electrical and electronic products. Magnetic iron oxide pigments are used in audio and video tapes and cassettes and in magnetic printing inks. Magnetic and electronic applications for iron oxide pigments are the fastest growing uses.

Industrial uses: Other, Catalyst, Solids separation.

Consumer uses: Binder, Other.

Use classes: Cosmetics.

Cosmetic ingredient, INCI name CI 77489(colorant)

Functional uses

  • Dye
  • Pigment

Cosmetic functions

  • Colorant

How it is made

Prepared from ores and minerals by washing, drying, grinding, blending and calcining

Prepared from the oxalate by heating, but the product contains some ferric oxide.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex IV, allowed colourant
    Name: CI 77489, Ref no: 134, Annex ref: IV/134

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Ferrous oxide is traded under.

HS 2821.10Indicative HS code

Iron oxides and hydroxides

World exports in 2024
$669M
+0.0% vs 2023, imports $910M
2019 to 2024
Top exporters
  1. China48.4%
  2. United States7.3%
  3. Italy5.5%
Top importers
  1. United States27.1%
  2. China8.9%
  3. United Kingdom3.8%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Ferrous oxide is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Ferrous oxide, based on the data on this page

What is Ferrous oxide?

Ferrous oxide is a chemical substance with the molecular formula FeO and a molar mass of 71.84 g/mol. Its CAS registry number is 1345-25-1. The IUPAC name is iron(2+), oxygen(2-).

What is the CAS number of Ferrous oxide?

The CAS registry number of Ferrous oxide is 1345-25-1.

What is the molecular formula and weight of Ferrous oxide?

The molecular formula of Ferrous oxide is FeO and its molar mass is 71.84 g/mol.

What is Ferrous oxide used for?

In manufacture of green, heat-absorbing glass, in steel manufacture, in enamels, as catalyst. Iron oxide pigments are widely used to provide color, hiding power, and/or reinforcement in paints, coatings, construction materials, plastics, paper, glass, ceramics, and rubber goods.

Is Ferrous oxide hazardous?

No GHS hazard classification for Ferrous oxide is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Ferrous oxide?

Ferrous oxide is usually classified under HS code 282110 (Iron oxides and hydroxides). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Ferrous oxide?

CompoundList lists 11 suppliers of Ferrous oxide in United States, India, China, Germany and 1 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Ferrous oxide in India?

2 suppliers in India list Ferrous oxide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Ferrous oxide?

Suppliers quote Ferrous oxide on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Ferrous oxide

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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