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CAS Number : 1345-25-1
EC Number : 215-721-8
Molecular Formula : FeO
Molecular Weight : 71.84
E 172 (Iron oxide)s are chemical compounds composed of iron and oxygen.
Several iron oxides are recognized.
All are black magnetic solids.
Often they are nonstoichiometric.
Oxyhydroxides are a related class of compounds, perhaps the best known of which is rust.
E 172 (Iron oxide)s and oxyhydroxides are widespread in nature and play an important role in many geological and biological processes.
They are used as iron ores, pigments, catalysts, and in thermite, and occur in hemoglobin.
E 172 (Iron oxide)s are inexpensive and durable pigments in paints, coatings and colored concretes.
Colors commonly available are in the "earthy" end of the yellow/orange/red/brown/black range.
When used as a food coloring, it has E number E172.
Stoichiometries of E 172 (Iron oxide)
E 172 (Iron oxide) feature ferrous (Fe(II)) or ferric (Fe(III)) or both.
Fe adopts an octahedral or tetrahedral coordination geometry.
Oxide adopts tetrahedral or octahedral coordination.
Only a few oxides are significant at the earth's surface, particularly wüstite, magnetite, and hematite.
Oxides of FeII
-FeO: iron(II) oxide, wüstite
Mixed oxides of FeII and FeIIIFe3O4:
-Iron(II,III) oxide, magnetite
-Fe4O5
-Fe5O6
-Fe5O7
-Fe25O32
-Fe13O19
Oxide of FeIII
-Fe2O3: iron(III) oxide
-α-Fe2O3: alpha phase, hematite
-β-Fe2O3: beta phase
-γ-Fe2O3: gamma phase, maghemite
-ε-Fe2O3: epsilon phase
Reactions of E 172 (Iron oxide)
In blast furnaces and related factories, E 172 (Iron oxide)s are converted to the metal.
Typical reducing agents are various forms of carbon.
A representative reaction starts with ferric oxide:
2 Fe2O3 + 3 C → 4 Fe + 3 CO2
In nature
E 172 (Iron oxide) is stored in many organisms in the form of ferritin, which is a ferrous oxide encased in a solubilizing protein sheath.
Species of bacteria, including Shewanella oneidensis, Geobacter sulfurreducens and Geobacter metallireducens, use E 172 (Iron oxide) as terminal electron acceptors.
Uses of E 172 (Iron oxide)
Almost all iron ores are oxides, so in that sense these materials are important precursors to iron metal and its many alloys.
E 172 (Iron oxide)s are important pigments, coming in a variety of colors (black, red, yellow). Among their many advantages, they are inexpensive, strongly colored, and nontoxic.
Magnetite is a component of magnetic recording tapes.
Synthetic E 172 (Iron oxide) pigments are used in a variety of applications to colour food, cosmetics and pharmaceutical products.
The E172 grades supplied by International Speciality Chemicals offer industry leading levels of purity and so can be used with confidence in applications that require the use of high-purity iron oxide products.
Through a combination of advanced processing and selection of raw ingredients, the trace elements of other metals in the iron oxide range of products is at an obsolute minimum.
Iron Oxide E172 , is the principal product used as the base for eye shadows / mascaras, as it conforms to all current standards for use in cosmetics around the sensitive eye area.
Reds and Yellows are used as a base in other cosmetics where they supplement other types of colourants in producing vivid colours.
Applications in the food sector also means iron oxide pigments have become the leading colourant used in pet foods today.
Just one of the many versatile ways iron oxide pigments add colour to our lives.
Iron oxides used as food colorants are listed in the European Union with the number E172.
However, there are no specifications concerning the fraction of nanoparticles in these pigments.
E172 is a food additive approved by the European Union (EU).
E 172 (Iron oxide) is used as a natural colouring agent in food and drink products.
The common names for E172 include certain iron oxides and iron hydroxides.
E172 is a red/brown colouring that is available in three forms:
-E172(i) - black iron oxide,
-E172(ii) - red iron oxide, and
-E172(iii) - yellow iron oxide.
The iron is not actively absorbed by body tissue.
This colouring may act as an irritant when in dust form.
E172 is banned in Germany.
Examples of food and drink products that sometimes include E172:
-salmon pastes
-shrimp pastes
-meat pastes
-cake and dessert packets
-soups
E 172 (Iron oxide) is an iron oxide.
Product from the E 172 (Iron oxide) process for the removal of sulfides from gases.
In this process gases are passed over a mixture of iron(III) oxide and wood shavings.
Liable to spontaneous heating.
This heat may cause ignition.
Easily ignited by sparks or heat from external sources.
Used for precipitating copper or lead from solutions of their salts and in electric furnace steel operations.
Use and Manufacturing of E 172 (Iron oxide)
Used as a catalyst and to make steel, enamels, and heat-absorbing glass; [Merck Index]
E 172 (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 E 172 (Iron oxide) is 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.
Industry Uses of E 172 (Iron oxide)
-Agricultural chemicals (non-pesticidal)
-Engineered fill for construction
-Graveling and road bed material.
-Intermediates
-Process regulators
-Smelter feedstock production
-incorporation as aggregate into concrete
Consumer Uses of E 172 (Iron oxide)
-Agricultural products (non-pesticidal)
-Building/construction materials not covered elsewhere
-Metal products not covered elsewhere
Household Products of E 172 (Iron oxide)
Household & Commercial/Institutional Products
Information on 25 consumer products that contain C.I. Iron Oxides in the following categories is provided:
-Personal Care
-Pesticides
Methods of Manufacturing of E 172 (Iron oxide)
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.
General Manufacturing Information of E 172 (Iron oxide)
Industry Processing Sectors
-All other basic inorganic chemical manufacturing
-All other chemical product and preparation manufacturing
-Construction
-Pesticide, fertilizer, and other agricultural chemical manufacturing
-Primary metal manufacturing
Description of E 172 (Iron oxide)
E 172 (Iron oxide)s are chemical compounds composed of iron and oxygen.
There are sixteen known iron oxides and oxyhydroxides, the best known of which is rust, a form of iron(III) oxide.
Iron oxides and oxyhydroxides are widespread in nature and play an important role in many geological and biological processes.
They are used as iron ores, pigments, catalysts, and in thermite, and occur in hemoglobin.
Iron oxides are inexpensive and durable pigments in paints, coatings and colored concretes.
Colors commonly available are in the "earthy" end of the yellow/orange/red/brown/black range.
When used as a food coloring, it has E number E172.
Synthetic E 172 (Iron oxide) consists of any one or any combination of synthetically prepared iron oxides, including the hydrated forms.
Iron oxides are produced from ferrous sulfate by heat soaking, removal of water, decomposition, washing, filtration, drying, and grinding.
They are produced in either anhydrous or hydrated forms.
The range of hues for synthetic E 172 (Iron oxide) includes yellows, reds, browns and blacks.
Typical applications include cosmetics, and pharmaceuticals, and foods, including confectionery, cereals, edible ices, sausage casings, dietary supplements, flavored milk and water based drinks, soups and broths, and fruit preparations.
Applications of E 172 (Iron oxide):
-Cosmetics
-Pharmaceuticals
-Soaps
-Mortar
-Cement
E 172 (Iron oxide) or ferric oxide is the main source of iron for the steel industry.
E 172 (Iron oxide) is often called rust, and is acidic in nature.
Appear as a very fine powder, E 172 (Iron oxide) is used to put the final polish on metallic jewelry and lenses, and historically as a cosmetic.
E 172 (Iron oxide) is also used as a pigment, under names "Pigment Brown 6", "Pigment Brown 7", and "Pigment Red 101", for use in cosmetics and in dental composites alongside titanium oxides.
Used as a food coloring (E172), E 172 (Iron oxide) can be found in cake and dessert mixes, meat paste, salmon and shrimp paste.
E 172 (Iron oxide) is approved to use as food and cosmetics coloring in EU.
In US, E 172 (Iron oxide) is used as color additives and exempt from certification and permanently listed for food and drug use.
E 172 (Iron oxide)s are chemical compounds composed of iron and oxygen.
There are sixteen known iron oxides and oxyhydroxides, the best known of which is rust, a type of iron(III) oxide.
E 172 (Iron oxide)s and oxyhydroxides are common in nature and play an important role in many geological and biological processes.
They are used in iron ores, pigments, catalysts and termite, and are found in hemoglobin.
E 172 (Iron oxide)s are inexpensive and durable pigments used in paints, coatings and colored concrete.
E 172 (Iron oxide)s are in four groups according to their color pigments and chemical contents.
These are divided into okr, ombra, cyan and red iron oxides.
Of these, arrows are yellow to red; ombras are in shades of brown; cyenas appear from yellow to orange.
Natural iron oxide pigments emerge from magnetite.
Spain and the USA are the countries that produce the most iron oxide.
Today, synthetic iron oxide pigments are widely produced in chemical media.
First of all, synthetic red iron oxide production can be done by four different methods.
One of them is carried out by chemical dissolution, while the remaining three are by the principle of calcination.
As a result of these methods, very different shades of red pigment can be produced.
The production of yellow pigments, on the other hand, enables the production of yellow pigment in different shades from orange to light yellow as a result of three different processes.
Brown pigments are obtained by three methods.
The first of these is direct precipitation.
The second is the production of synthetic black pigment by a controlled reaction.
The third method is by mixing yellow, red and black pigments.
Black oxides are produced by a similar method with yellow.
E 172 (Iron oxide) Used
-In paint production and coloring
-in making ceramics
-In the production of rubber parquet and floors
-In the production of linings
-In the art of stone painting
-Coloring of concrete
-In the paper production industry
E 172 (Iron oxide) Usage Areas (Processes)
-E 172 (Iron oxide) is used in many fields of painting and handicrafts because it is water-soluble in different colors.
-Because E 172 (Iron oxide) is an affordable pigment, E 172 (Iron oxide) is used for coloring purposes in the production of products such as pharmaceuticals, cosmetics, bricks, mortars, inks, tiles and rubbers.
-Hematite is used in primary dyeing processes due to its low oil absorption and large size.
-Processed natural E 172 (Iron oxide) is used in the production of electronic and magnetic inks.
-In the corrosion control of the lamellar film structure, micaceous iron oxide or a specular hematite plated iron oxide is used.
-Finely ground hematite, which has abrasive properties, is used as a polishing agent for polishing jewellery.
-Hematite is also used in drilling mud thanks to its specific gravity.
Properties of E 172 (Iron oxide):
1). Bright-colored exquisite powder.
2). Good weatherability (Lightfastness, heat-resistant and alkali resistant)
3). Strong tinting power, excellent coverage and fine dispersion.
4). We can supply iron oxide with different color, specifications and packing
5). Only dissolved in heat strong acid.
E 172 (Iron oxide) Uses:
1) Used for dyeing construction materials, such as Asphalt, mosaic bricks, for concrete bricks, pavement, colorful tiles, roofing tiles and man-made marble, Colors for ceramic body.
2) Colored fertilizer granules.
3) Used in paper industry, esp. rice paper.
4) Used for surface coloration of plastic epoxy floor, color for pitch.
5) Used as a more fade-resistant dye for plastics.
6) Pigment for Cosmetic,
7) Used in many types of paints, including anti-rust paint, water-soluble indoor/outdoor paints and oil-based paints.
First-aid measures of E 172 (Iron oxide)
Eye Contact :
Rinse immediately with plenty of water, also under the eyelids, for at least 15 minutes.
Get medical attention.
Skin Contact :
Wash off immediately with plenty of water for at least 15 minutes.
Get medical attention immediately if symptoms occur.
Inhalation :
Remove from exposure, lie down.
Remove to fresh air.
If breathing is difficult, give oxygen.
If not breathing, give artificial respiration.
Get medical attention.
Ingestion :
Do NOT induce vomiting.
Get medical attention.
Substance identity
EC / List no.: 215-721-8
CAS no.: 1345-25-1
Mol. formula: FeO
Hazard classification & labelling of E 172 (Iron oxide)
According to the notifications provided by companies to ECHA in REACH registrations no hazards have been classified.
About E 172 (Iron oxide)
E 172 (Iron oxide) is registered under the REACH Regulation and is manufactured in and / or imported to the European Economic Area, at ≥ 100 to < 1 000 tonnes per annum.
E 172 (Iron oxide) is used by professional workers (widespread uses), at industrial sites and in manufacturing.
Consumer Uses of E 172 (Iron oxide)
ECHA has no public registered data indicating whether or in which chemical products the substance might be used.
ECHA has no public registered data on the routes by which E 172 (Iron oxide) is most likely to be released to the environment.
Article service life of E 172 (Iron oxide)
ECHA has no public registered data on the routes by which E 172 (Iron oxide) is most likely to be released to the environment.
ECHA has no public registered data indicating whether or into which articles the substance might have been processed.
Widespread uses by professional workers of E 172 (Iron oxide)
ECHA has no public registered data indicating whether or in which chemical products the substance might be used.
E 172 (Iron oxide) is used in the following areas: formulation of mixtures and/or re-packaging and building & construction work.
Release to the environment of E 172 (Iron oxide) can occur from industrial use: formulation of mixtures.
Other release to the environment of E 172 (Iron oxide) is likely to occur from: outdoor use resulting in inclusion into or onto a materials (e.g. binding agent in paints and coatings or adhesives).
Formulation or re-packing of E 172 (Iron oxide)
ECHA has no public registered data indicating whether or in which chemical products the substance might be used.
ECHA has no public registered data on the routes by which E 172 (Iron oxide) is most likely to be released to the environment.
Uses at industrial sites of E 172 (Iron oxide)
E 172 (Iron oxide) is used in the following products: pH regulators and water treatment products and metals.
E 172 (Iron oxide) has an industrial use resulting in manufacture of another substance (use of intermediates).
E 172 (Iron oxide) is used in the following areas: building & construction work.
E 172 (Iron oxide) is used for the manufacture of: chemicals and metals.
Release to the environment of E 172 (Iron oxide) can occur from industrial use: as an intermediate step in further manufacturing of another substance (use of intermediates), as processing aid, manufacturing of the substance and in the production of articles.
Manufacture of E 172 (Iron oxide)
Release to the environment of E 172 (Iron oxide) can occur from industrial use: manufacturing of the substance and in the production of articles.
Synonyms:
Iron(II) oxide
FERROUS OXIDE
oxoiron
1345-25-1
Iron monooxide
Iron monoxide
Iron(ii)oxide
Wustite
Natural wuestite
Iron oxide (FeO)
Eisenoxydul
iron-oxygen
HSDB 464
Eisen(II)-oxid
Iron(2) oxide
EINECS 215-721-8
iron(2+) oxide
CI 77489
Iron(II) oxide, CP
C.I. 77489
EC 215-721-8
Iron(2+);oxygen(2-)
CHEBI:50820
MFCD00016095
AKOS015913785
17125-56-3
Q196680
Iron(II) oxide, -10 mesh, 99.8% trace metals basis
Iron oxide
Iron oxide
iron oxide
Iron oxide (FeO)
Iron oxide (FeO)
Eisenmonoxid
iron (II) oxide
Iron Oxide
Iron oxide
iron oxide
Iron oxide
oxoiron
iron oxide
1345-25-1
