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Home> Encyclopedia >   /  Oxide  /  Oxide  /  Oxide
1345-25-1 structure

Ferrous oxide

Iupac Name:oxoiron
CAS No.:1345-25-1
EINECS(EC#): 215-721-8
Molecular Weight:71.844
Molecular Formula:FeO (isomer)
1. Names and Identifiers
1.1 Synonyms

AC1L24UI AN-49101 c.i. 77489 CHEBI:50820 CI 77489 CTK8G0357 DTXSID1041976 eisen(ii)-oxid eisenoxydul Ferrous(ic)Oxide hsdb 464 iron monooxide iron monoxide iron oxide (feo) iron(2) oxide iron(2+) oxide iron(ii) oxide Iron(II) oxide -10 Mesh, 99.9% trace Metals basis iron(ii) oxide, -10 mesh, 99.8% trace metals basis IRON(II) OXIDE, -10 MESH, 99.9% iron(ii) oxide, 99.5% trace metals basis, may contain trace amounts of other phases 5g Iron(II)oxide,99.5%(metalsbasis) ironoxide[feo][qr] mfcd00016095 Natural wuestite naturalwuestite[qr] oxoiron

1.2 Inchi
1.3 InChkey
1.4 Canonical Smiles
2. 3D Conformer
3. Properties
3.1 Appearance
3.2 Density
5.7?g/mL?at 25?°C(lit.)
3.3 Melting Point
3.4 Solubility
Practically insol in water and alkalies; readily sol in acids
Insoluble in alcohol
3.5 Color/Form
Black cubic crystals
3.6 Stability
Stable. Incompatible with strong oxidizing agents. Highly flammable.
3.6 Stability
3.7 Spectral properties
4. Safety and Handling
4.1 Hazard Codes
4.1 Risk Statements
4.2 Safety Statements
4.3 Safety

Ignites when heated in air above 200°C. The powdered oxide may be pyrophoric. Incandescent or hazardous reaction with nitric acid (with powdered oxide), hydrogen peroxide, sulfur dioxide + heat. See also IRON and IRON COMPOUNDS.
Safety Information of?Iron(II) oxide (CAS NO.1345-25-1):
Hazard Codes: FFlammable
Risk Statements: 11???
R11:Highly flammable.
Safety Statements: 16-33-7/9?
S16:Keep away from sources of ignition.?
S33:Take precautionary measures against static discharges.?
S7:Keep container tightly closed.?
S9:Keep container in a well-ventilated place.
RIDADR: UN 3178 4.1/PG 2

4.4 Sensitive
Air Sensitive
4.5 Skin, Eye, and Respiratory Irritations
If inhaled, iron is a local irritant to the lung and gastrointestinal tract. /Iron compounds/
4.6 Cleanup Methods
Sweep spilled substance into covered containers; if appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water.
4.7 Transport
UN 3178 4.1/PG 2
4.8 Fire Fighting Procedures
In case of fire in the surroundings: all extinguishing agents allowed.
4.9 Fire Potential
Ferrous oxide is spontaneously flammable in air.
The oxide (prepared at 300 deg C) burns in air above 200 deg C, while the finely divided oxide prepared by reduction may be pyrophoric at ambient temperature. That prepared by thermal decomposition under vacuum of iron(II)oxalate is also pyrophoric.
4.10 Reactivities and Incompatibilities
Fluorine does not act in the cold on ferrous oxide, but with gentle heat a reaction sets in with incandescence.
When ferrous oxide, prepared at 300 deg C, is heated in sulfur dioxide, the mass becomes incandescent.
Easily oxidized by air. It is a strong base and readily absorbed /carbon dioxide/.
The oxide incandesces when heated in sulfur dioxide.
Ignites when heated in air above 200 deg C
Hazardous reaction with nitric acid (powdered oxide); hydrogen peroxide; sulfur dioxide and heat.
When pyrophoric iron oxide is gently warmed with nitric acid, the oxide becomes incandescent.
4.11 Other Preventative Measures
SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.
All ... /iron/ preparations should be kept in child-proof bottles. /Iron preparations/
4.12 Protective Equipment and Clothing
If inhaled, iron is a local irritant to the lung and gastrointestinal tract. /Iron compounds/
4.13 Specification

?Iron(II) oxide , its CAS NO. is 1345-25-1, the synonyms are Iron monooxide ; Natural wuestite ; Iron(II) oxide .

4.14 Report

Related compounds: Iron(III) oxide, Iron(II,III) oxide

4.15 Disposal Methods
SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

2.Hazard identification

2.1 Classification of the substance or mixture

Not classified.

2.2 GHS label elements, including precautionary statements

Pictogram(s) No symbol.
Signal word

No signal word.

Hazard statement(s)


Precautionary statement(s)








2.3 Other hazards which do not result in classification


8. Computational chemical data
  • Molecular Weight:71.844g/mol
  • Molecular Formula:FeO
  • Compound Is Canonicalized:True
  • Exact Mass:71.93
  • Monoisotopic Mass:71.93
  • Complexity:2
  • Rotatable Bond Count:0
  • Hydrogen Bond Donor Count:0
  • Hydrogen Bond Acceptor Count:1
  • Topological Polar Surface Area:17.1A^2
  • Heavy Atom Count:2
  • Defined Atom Stereocenter Count:0
  • Undefined Atom Stereocenter Count:0
  • Defined Bond Stereocenter Count:0
  • Undefined Bond Stereocenter Count:0
  • Isotope Atom Count:0
  • Covalently-Bonded Unit Count:1
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