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Ferrous oxide

HCID 449809
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Basic information

CAS
1345-25-1
Standard SMILES
[Fe+2].[O-2]
InChIKey
VBMVTYDPPZVILR-UHFFFAOYSA-N
Molecular formula
FeO
Average molar mass
71.84 g/mol
Monoisotopic mass
71.92985

Overview

See also: Ferrous cation (has active moiety).

Names & identifiers

Preferred name
Ferrous oxide
IUPAC
iron(2+);oxygen(2-)
English name
Iron (II) oxide
Molecular formula
FeO
Molecular weight
71.84

Names & synonyms

Iron oxide (FeO)DTXSID1041976G7036X8B5HCI 77489C.I. 77489IRON (II) OXIDERefChem:921574DTXCID201323594215-721-81345-25-1CHEBI:50820Ferrous oxide
Show more names
FeOOFEODFROSTSPDB2CD265OPTB7TRANCER
Iron monooxideIron monoxideIron(II) oxideNatural wuestiteMOLI000197FERROUS OXIDE [II]FERROUS OXIDE [MI]SCHEMBL66546

Database identifiers

CAS
1345-25-1
PubChem CID
449809
DTXSID
DTXSID1041976
UNII
G7036X8B5H

Properties

Computed structural properties

Topological polar surface area
1 Ų
Hydrogen bond donors
0
Hydrogen bond acceptors
1
Rotatable bonds
0
Heavy atoms
2
Formal charge
0
Complexity
0

Experimental & physicochemical properties

Chemical ClassesMetals -> Metals, Inorganic Compounds
CosmeticsCosmetic colorant
SpringerMaterials Propertiesphonon wavenumber
Density · 3 items

6.0 g/cu cm

5.7 g/cm³

6 @25 °C

Color/FormBlack cubic crystals
Solubility · 3 items

Practically insol in water and alkalies; readily sol in acids

Insoluble in alcohol

Solubility in water: none

Melting Point · 3 items

1377 °C

1360 °C

1377 °C

Refractive IndexINDEX OF REFRACTION: 2.23
Physical Description · 3 items

Large Crystals; Other Solid

Black solid; [ICSC] Black odorless powder; Insoluble in water; [MSDSonline]

BLACK SOLID IN VARIOUS FORMS.

Safety & regulation

Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.

Hazard information

Regulatory Information · 3 items

Chemical: Iron oxide (FeO)

Iron oxide (FeO) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Iron oxide (FeO) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Iron oxide (FeO): Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.

Other Safety InformationIMAP assessments - Iron oxide (FeO): Environment tier I assessment
Fire HazardsCombustible under specific conditions.
Fire Potential · 2 items

Ferrous oxide is spontaneously flammable in air.

The oxide (prepared at 300 °C) burns in air above 200 °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.

Hazards SummaryChronic inhalation of dust can result in siderosis; [ICSC] An irritant; [MSDSonline] See Iron oxide (Fe2O3).
Special ReportsJoint FAO/WHO Expert Committee on Food Additives; WHO Food Additives Ser 6: Iron oxides and hydrated iron oxides (1975). Available from: http://www.inchem.org/documents/jecfa/jecmono/v06je23.htm as of September 14, 2004.
Chemical DangersDepending on the preparation method, the substance may ignite spontaneously on contact of finely divided powder with air or may burn on contact with air when heated above 200 °C. The substance readily absorbs carbon dioxide.
Federal Drinking Water Guidelines

Chemistry & industry

Uses & manufacturing

Uses · 5 items

Used as a catalyst and to make steel, enamels, and heat-absorbing glass; [Merck Index]

Steel Producing [Category: Industry]

Enameling [Category: Hobbies]

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.

ImpuritiesProduct contains ferric oxide
U.S. Exports(1984) 3.90X10+9 g /Iron Oxides & Hydroxides/
U.S. Imports(1984) 1.85X10+10 g /Iron Oxides & Hydroxides, synthetic: NSPF, yellow, Red 7 Black
U.S. Production · 2 items

2023: 55,000,000 - <70,000,000 lb

(1981) 1.28X10+11 g /Natural & Synthetic Iron Oxides Sold/

Consumption PatternsPaints & coatings, 37%; Building materials, 22%; Plastics, inks, rubber, glass coloring, 11%; Ferrites & magnetic uses, 9%; Industrial chemicals, 7%; Animal feeds and fertilizers, 7%; and Misc, 7% (1981) /Iron Oxides/
Consumer UsesBinder
Industry UsesOther
Methods of Manufacturing

Related reactions

19 records
New reaction record
HRID 435217 reaction equation
HRID 435217As catalystuspto-grants-1983_08
HRID 435218 reaction equation
HRID 435218As catalystuspto-grants-1983_08
HRID 968330 reaction equation
HRID 968330As catalystuspto-grants-2005_10
HRID 981444 reaction equation
HRID 981444As productuspto-grants-1991_02
HRID 1178163 reaction equation
HRID 1178163As productAs reactantuspto-grants-2007_10
HRID 1178166 reaction equation
HRID 1178166As catalystuspto-grants-2007_10
HRID 1185980 reaction equation
HRID 1185980As productuspto-grants-2014_03
HRID 1461126 reaction equation
HRID 1461126As catalystuspto-grants-1991_12
Page 1 of 3

Compound notes

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Other Experimental Properties
Easily oxidized by air; it is strong base and readily absorbs carbon dioxide

Physicochemical properties

Melting point
1369 °C · 1369°C
Density
5.7 g/mL · 5.7 g/mL at 25 °C(lit.)
solubility
2 O, · insoluble in H2O, alkaline solutions; soluble in acid solutions
form
5 Mesh · 5 Mesh
color
black cubic crystals, crystalline
Water Solubility
2 · Insoluble in water and alkalies. Soluble in HCl, H{2}SO{4}. Slightly soluble in HNO{3}Insoluble in water, alcohol and alkali. Soluble in hydrochloric acid and sulfuric acid. Slightly soluble in nitric acid.
Sensitive
Air Sensitive
Crystal Structure
NaCl type
crystal system
Cube
Merck
14 · 14,4052
Space group
3 m · Fm3m
Lattice constant
a/nm
Symbol(GHS)
7 · GHS07
Signal word
Warning
Hazard statements
315 · H315-H319
Precautionary statements
264 · P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313
Hazard Codes
F
Risk Statements
11 · 11
Safety Statements
16 · 16-33-7/9
RIDADR
3178 · UN 3178 4.1/PG 2
OEB
B
OEL
5 mg/m3 · TWA: 5.0 mg/m3
WGK Germany
-
TSCA
TSCA listed
Storage Class
13 · 13 - Non Combustible Solids
Hazardous Substances Data
1345 · 1345-25-1(Hazardous Substances Data)
REACH Registrations
Active
EPA 300 ug/L /Iron/
Skin, Eye, and Respiratory IrritationsIf inhaled, iron is a local irritant to the lung and gastrointestinal tract. /Iron compounds/
Hazardous Reactivities and Incompatibilities · 5 items

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 °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.

For more Hazardous Reactivities and Incompatibilities (Complete) data for FERROUS OXIDE (7 total), please visit the HSDB record page.

Safety & protection

Fire FightingIn case of fire in the surroundings, use appropriate extinguishing media.
First Aid Measures · 4 items

Fresh air, rest.

Rinse and then wash skin with water and soap.

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

Rinse mouth.

Fire Fighting ProceduresIn case of fire in the surroundings: all extinguishing agents allowed.
Cleanup MethodsSweep spilled substance into covered containers; if appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water.
Disposal Methods · 1 item

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.

Spillage Disposal · 1 item

Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Wash away remainder with plenty of water.

Preventive Measures · 2 items

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/

Eye PreventionWear safety spectacles.
Inhalation RiskA harmful concentration of airborne particles can be reached quickly when dispersed, especially if powdered.
Skin PreventionProtective gloves.
Exposure PreventionPREVENT DISPERSION OF DUST!
Ingestion PreventionDo not eat, drink, or smoke during work.

Toxicology

Ecotoxicity ValuesLC50 Gambusia affinis (Western mosquitofish) >10,000 mg/L/24, 48, 96 hr; static
Signs and SymptomsCough.
Natural Pollution SourcesHematite, goethite, and lepidocrocite /are minerals that/ contain ferrous oxide
Human Toxicity Excerpts · 3 items

/HUMAN EXPOSURE STUDIES/ Collection of iron dust in lungs ... has been termed siderosis... Siderosis is considered benign condition and does not progress to fibrosis. /Iron oxide fume/

/CASE REPORTS/ ...Two women underwent dermopigmentation on the face in a beauty institution to create pseudo-freckles. Definite macular hyperpigmentation occurred with dyschromia in both subjects.

/CASE REPORTS/ ...Histopathologic studies /were performed/ on a series of three eyelid specimens, including two by a previously undescribed multi-needle pigment delivery system. Light microscopy revealed the epidermis to be pigment-free and the dermis to contain pigment in clumps. Transmission electron microscopy (EM) demonstrated that the pigment was largely in macrophages. Energy-dispersive x-ray micro-analysis showed that in addition to iron and talc, titanium particles were also present. These findings suggest that the pigment is tolerated by the eyelid despite the fact that current pigments are contaminated.

Non-Human Toxicity Excerpts · 3 items

/LABORATORY ANIMALS: Subchronic or Prechronic Exposure/ Dogs were injected with iron oxide iv each week for 6-10 weeks, until a total of 0.5 or 1.0 g/kg of iron was administered to each of two dogs. The four dogs were then followed for seven years. Hepatic function tests and biopsies of liver, spleen, pancreas and other organs were performed. Hemochromatosis was not induced, but blindness, with lesions similar to retinitis pigmentosa, developed in all dogs. No control group was included in this study. /Iron oxide, nos/

/LABORATORY ANIMALS: Chronic Exposure or Carcinogenicity/ Ten males and three female /minks/ were fed iron oxide as 0.75% of their diet. Reproduction, whelping, and lactation were seen to be similar to that of controls. Six male and four female pups were then continued on the iron oxide diet until pelting (165 days). Although fur quality and growth were normal, these mink had acute nephrosis and hepatosis at pelting. /Iron oxide, nos/

/LABORATORY ANIMALS: Chronic Exposure or Carcinogenicity/ Ten dogs were fed from 1-9 years on diets containing iron oxide colorant at 570 mg/lb. Daily consumption was estimated at 428 mg/dog. Two Labradors fed one year had loose droppings, otherwise there were no adverse effects observed. /Iron oxide, nos/

Evidence for CarcinogenicityA4: Not classifiable as a human carcinogen. /Iron oxide (Fe2O3)/
Antidote and Emergency Treatment · 5 items

Basic treatment: Establish a patent airway. Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if necessary. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for shock and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with normal saline during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool ... . /Iron and Related Compounds/

Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious. Monitor cardiac rhythm and treat arrhythmias if necessary ... . Start an IV with lactated Ringer's /SRP: "To keep open", minimal flow rate/. Watch for signs of fluid overload. For hypotension with signs of hypovolemia, administer fluid cautiously. Watch for signs of fluid overload ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Iron and Related Compounds/

Maintain an open airway and assist ventilation if necessary. Treat shock caused by hemorrhagic gastrointestinitis aggressively with intravenous crystalloid fluids, and replace blood if needed. Patients are often markedly hypovolemic owing to gastrointestinal losses and third spacing of fluids into the intestinal wall and interstitial space. Treat coma, seizures, and metabolic acidosis if they occur. For seriously intoxicated victims (eg, shock, severe acidosis, and/or serum iron > 500-600 mcg/dL) administer deferoxamine. Monitor the urine for the urine for the characteristic orange or pink deferoxamine-iron complex. Therapy may be stopped when the urine returns to normal or when the serum iron level decreases to the normal range. Prolonged deferoxamine has been associated with adult respiratory distress syndrome and Yersinia sepsis.

Activated charcoal is not effective. Ipecac is not recommended, because it can aggravate iron-induced gastrointestinal irritation and interfere with whole bowel irrigation. Consider gastric lavage if product was a liquid formulation or tablets were chewed. Do-not use phosphate-containing solutions for lavage; these may result in life-threatening hypernatremia, hyperphosphatemia, and hypocalcemia. Bicarbonate and deferoxamine lavage are of doubtful efficacy. Deferoxamine lavage is not effective and may enhance iron absorption. Whole-bowel irrigation is very effective for ingested tablets and may be considered first-line treatment, especially if large numbers of tablets are visible on plain abdominal x-ray. Massive ingestions may lead to concretions or bezoars. Repeated or prolonged whole-bowel irrigation may remove tablets. Endoscopy or surgical gastrotomy is rarely required.

Hemodialysis and hemoperfusion are not effective for removing iron but may be necessary to remove iron-deferoxamine complex in patients with renal failure. Exchange transfusion is occasionally used for massive pediatric ingestions but is of questionable efficacy.

Non-Human Toxicity Values · 3 items

LD50 Rat oral >15 g/kg /Iron oxide, nos/

LD50 Mouse oral >15 g/kg /Iron oxide, nos/

LD50 Rat ip >15 g/kg /Iron oxide, nos/

Regulatory information

Federal Drinking Water GuidelinesEPA 300 ug/L /Iron/

Safety data

OEB
B
OEL
TWA: 5.0 mg/m3
wgk
-
tsca
TSCA listed
ridadr
UN 3178 4.1/PG 2
risk_code
11
Signal word
Warning
Symbol(GHS)
GHS07
hazard_code
F
safety_code
16-33-7/9
Storage Class
13 - Non Combustible Solids
Hazard statements
H315-H319
REACH Registrations
Active
Precautionary statements
P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313
Hazardous Substances Data
1345-25-1(Hazardous Substances Data)
· 2 items

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.

Household ProductsInformation on 50 consumer products that contain C.I. Iron Oxides in the following categories is provided:
Use ClassificationCosmetics -> Cosmetic colorant
General Manufacturing Information · 4 items

Construction

Iron oxide (FeO): ACTIVE

/Suntan preparations/ these articles contain alcohol, sodium, methyl or ethyl-p-aminobenzoate, titanium dioxide, iron oxide pigments, etc.

...Pure oxides of iron...catalysts that may cause liquid ethylene oxide to rearrange and/or polymerize, liberating heat.

Applications · 4 items

DescriptionWhen iron is heated in a low partial pressure of oxygen above 575°C, FeO is formed. However, this is only stable at high temperatures and decomposes into iron and Fe304 when it is cooled slowly. To obtain crystalline FeO the high temperature product must be quenched rapidly to stop this disproportionation.

OccurrenceIron(II) oxide occurs in the mineral, wustite. It is used in the manufacture of heat-absorbing green glasses. It also is used in ceramic mixtures and enamels; and as a catalyst.

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

UsesIn manufacture of green, heat-absorbing glass; in steel manufacture; and as a catalystIron(II) oxide is used in manufacturing of green, heat-absorbing glass; in steel manufacture; and as a catalyst. It is used as a dye or pigment in pottery, glazes and glasses. It finds application as heat-absorbing glass used in buildings and automobiles. It is used as a precursor in the production of steel. It is also used in cosmetics and some tattoo inks. It can also be used for filtering phosphates from home aquaria and acts as a catalyst in a number of industrial and chemical operations.

Preparation methods · 1 item

PreparationIron(II) oxide may be prepared by thermal decomposition of iron(II) oxalate: FeC2O4 → FeO + CO + CO2 The product obtained above is impure, that may contain small quantities of triiron tetroxide, Fe3O4 and carbon. The oxide is stable above 575°C. Thus, it can be prepared by heating iron with oxygen under appropriate pressure at 575°C. Also, iron(II) oxide has been prepared by saturating the fused triiron tetroxide with iron, powdering the mixture, followed by magnetic separation of the oxide from excess iron (Sidgwick, N.V. 1950. The Chemical Elements and Their Compounds, Vol.2, pp 1328, Oxford: Clarendon Press).

Upstream & downstream products

Downstream products

Sodium thiocyanateIron oxide black

Additional notes

DefinitionChEBI: Ferrous oxide is an iron oxide.