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E 172
E172 is a food additive approved by the European Union (EU).
E172 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.
CAS: 1309-37-1;
1317-60-8;
1332-37-2
Molecular Formula: Fe2O3
Molecular Weight: 159.69
Synthetic Iron Oxide pigments are used in a variety of applications to colour food, cosmetics and pharmaceutical products.
The E172 / FDA 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 / FDA black, 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 E172 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 are chemical compounds composed of iron and oxygen.
Several iron oxides are recognized.
All are black magnetic solids.
Often they are non-stoichiometric.
Oxyhydroxides are a related class of compounds, perhaps the best known of which is rust.
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.
E172 is a food additive approved by the European Union (EU).
E172 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.
Examples of food and drink products that sometimes include E172:
-salmon pastes
-shrimp pastes
-meat pastes
-cake and dessert packets
-soups
E172 is a red transparent powder of the three crystal system.
The particles are fine, the particle size is 0.01 to 0.05 μm, the specific surface area is large (10 times that of ordinary iron oxide red), the ultraviolet absorption is strong, and the light resistance and the atmospheric resistance are excellent.
When light is projected onto a paint film or plastic containing a transparent iron oxide red pigment, it is in a transparent state.
The relative density of 5.7g/cm3, the melting point of 1396.
E172 is a new kind of iron pigment with unique properties.
Uses
E172 is mainly used as magnetic materials, pigments, polishing agents, catalysts, etc., but also for telecommunications, Instrument Industry
Inorganic red pigment.
E172 is mainly used for the transparent coloring of coins, but also for the coloring of paints, inks and plastics.
E 172 - Nature
Three-crystalline system powders of orange-red to magenta.
The relative density was 5.24.
Melting point 1565 °c (decomposition).
Insoluble in water, soluble in hydrochloric acid, sulfuric acid, nitric acid and alcohol-soluble.
Oxygen is released during burning and can be reduced to iron by hydrogen and carbon monoxide.
Good dispersion, color strength and hiding power.
Oil-free and water-permeable.
Temperature-resistant, light-resistant, acid-resistant, alkali-resistant.
E 172 - Preparation Method
The preparation methods include wet method and dry method.
Wet products Crystal fine, soft particles, easy to grind, suitable for pigment. Dry products crystallize large, hard particles, suitable for magnetic materials, polishing materials.
wet method: a certain amount of 5% ferrous sulfate solution is rapidly reacted with an excess of caustic soda solution (alkali excess is required to be 0. 04~0. 08g/mL), at room temperature into the air to make all the red brown ferric hydroxide colloidal solution, as the deposition of iron oxide nuclei.
The above crystal nucleus as the carrier, with ferrous sulfate as the medium, into the air, at 75~85 ℃, in the presence of metallic iron, ferrous sulfate and oxygen in the air, the formation of ferric oxide (ie, iron red) it is deposited on the crystal nucleus, and the sulfate in the solution interacts with the metal iron to regenerate the ferrous sulfate, and the ferrous sulfate is oxidized into iron red by air to continue the deposition, so that the cycle is to the end of the whole process to generate iron oxide red.
dry method: nitric acid reacts with iron flakes to form ferrous nitrate, which is cooled to crystallize, dehydrated and dried. After grinding, it is calcined at 600~700 ℃ for 8~10h, then washed with water and dried, the red iron oxide product was prepared by pulverization. Iron oxide red can also be obtained by calcining iron oxide yellow at 600 to 700 °c.
E 172 - Use
E172 is an inorganic pigment, which is used as an anti-rust pigment in the coating industry.
E172 is also used as a colorant for rubber, artificial marble, ground terrae, plastic, asbestos, artificial leather, leather paste and other colorants and fillers, precision instruments, polishing agent for optical glass, raw materials for producing magnetic material ferrite elements, and the like.
Iron oxides 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.
SYNONYMS:
Iron(III) oxide
Umber
oxo(oxoferriooxy)iron
MFCD00011008
Iron(III)oxidemono hydrate
Iron(III) oxide, dispersion
Eisen(III)-oxid
Maghemite (Fe2O3)
Eisentrioxid
iron-oxide
Zelaza tlenki
iron(3+) oxide
Iron Oxide Nanopowder
Iron Oxide Nano Rods
Nano Iron Oxide Powder
Zelaza tlenki [Polish]
Ferrous Oxide Nanopowder
Iron(III) Oxide Nanowires
Iron(III) oxide, 99%
NIOSH/NO7525000
CHEBI:50819
Ferric Oxide (Alpha) Nanopowder
Ferric Oxide (Gamma) Nanopowder
AKOS015904091
Iron(III) oxide, cosmetic, NanoArc?
Iron(III) oxide, magnetic, NanoArc?
Iron(III) oxide, purified, >=95%
DB11576
Iron(III) oxide (99.995%-Fe)
Iron(III) oxide, industrial, NanoArc?
12134-66-6
FT-0695872
NO75250000
Iron(III) oxide, powder, <5 mum, >=99%
Iron(III) oxide, 99.98% trace metals basis
Iron(III) oxide, SAJ first grade, >=98.0%
Iron(III) oxide, >=99.995% trace metals basis
Iron(III) oxide, Vetec(TM) reagent grade, 95%
J-005905
Iron Oxide Silicon Dioxide Titanium Oxide Core Shell
Iron(III) oxide, nanopowder, <50 nm particle size (BET)
Iron(III) oxide, pieces, 3-12 mm, 99.8% trace metals basis
