Iron oxide (Fe2O3)

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  • Identifiers

    CAS number
    1309-37-1

    Molecular formula
    Fe2O3

    SMILES
    O=[Fe]O[Fe]=O

    Safety labels

    Irritant
    Irritant

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Odorless 77.04%
    Pungent 27.55%
    Sharp 22.25%
    Ethereal 20.58%
    Sour 20.21%
    Sulfurous 18.67%
    Burnt 18.39%
    Cooked 15.39%
    Alliaceous 13.89%
    Fermented 13.74%

     

    Flavor
    Bitter 39.93%
    Odorless 38.55%
    Mustard 32.96%
    Pungent 31.38%
    Sulfur 27.45%
    Formyl 24.18%
    Vinegar 21.08%
    Mousy 20.57%
    Horseradish 20.57%
    Rotten 20.05%

     

  • Properties

    pKa est.
    -14.09 (strong acid)

    Molecular weight
    159.69 g/mol

    Melting point expt.

    • Iron 2664 °F
    • 1539 °C
    • 1565 °C
    • 2664 °F
    • 2849 °F

    Flash point

    • -44.1 ˚C est.

    Solubility expt.

    • Soluble in acids; insoluble in water, alcohol, ether
    • Solubility in water: none
    • Insoluble
    • Insoluble

  • Synonyms

    • Iron trioxide
    • Iron oxide, red
    • iron(3+) oxide
    • Anhydrous Ferric Oxide
    • Anhydrous Iron (III) Oxide
    • CHEBI:50819
    • Ferrum Oxydatum
    • Iron oxide,
    • Hematite 8124
    • Anhydrous Iron (III)
    • RefChem:55186
    • Ferric oxide (anhydrous)
    • DTXSID0029632
    • 616-935-8
    • 11554 Red
    • 1309-37-1
    • 1K09F3G675
    • 215-168-2
    • Anchred standard
    • Anhydrous iron oxide
    • Anhydrous oxide of iron
    • Armenian bole
    • Bayer S 11
    • Bayferrox 105M
    • Black oxide of iron
    • Calcotone Red
    • Caput mortuum
    • CI 77491
    • Colcothar
    • COSMETIC RED OXIDE
    • Crocus martis adstringens
    • Deanox
    • E 172 RED
    • Eisenoxyd
    • English Red
    • Ferric Oxide
    • Ferric oxide (colloidal)
    • Ferric Oxide Red
    • Ferric Oxide, Red
    • Ferric sesquioxide
    • Ferrugo
    • Hematite mineral
    • Indian Red
    • iron (III) oxide
    • Iron oxide (Fe2O3)
    • Iron Red
    • Iron sesquioxide
    • Jeweler's rouge
    • Jewelers rouge
    • Levanox Red 130A
    • Light Red
    • Mapico Red
    • Mars Brown
    • Mars Red
    • Natural hematite
    • Natural Red Oxide
    • Ochre
    • Prussian Brown
    • Quick rouge
    • Raddle
    • Red Ferric Oxide
    • Red Iron Oxide
    • RED IRON OXIDE R 1599D
    • Red oxide
    • Red oxide D3452
    • Red oxide D6984
    • Red oxide of iron
    • Rouge
    • Rubigo
    • Sienna
    • Sienna brown
    • Specular iron
    • Stone Red
    • Supra
    • Vitriol Red
    • Vogel's Iron Red
    • Yellow ferric oxide
    • Yellow oxide of iron
    • oxo(oxoferriooxy)iron
    • Maghemite (Fe2O3)
    • Iron(III)oxidemono hydrate
    • Iron(III) oxide, dispersion
    • 12134-66-6
    • Eisen(III)-oxid
    • Eisentrioxid
    • iron-oxide
    • Zelaza tlenki
    • 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%
    • SCHEMBL28673
    • NIOSH/NO7525000
    • Ferric Oxide (Alpha) Nanopowder
    • Ferric Oxide (Gamma) Nanopowder
    • Iron(III) oxide, nanopowder, <50 nm particle size (BET)
    • AKOS015904091
    • Iron(III) oxide, cosmetic, NanoArc?
    • Iron(III) oxide, purified, >=95%
    • DB11576
    • Iron(III) oxide (99.995%-Fe)
    • Iron(III) oxide, industrial, NanoArc?
    • 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%
    • Iron Oxide Silicon Dioxide Titanium Oxide Core Shell
    • Iron(III) oxide, pieces, 3-12 mm, 99.8% trace metals basis
    • 1309-37-1

  • Applications

    Iron oxide (Fe2O3), CAS 1309-37-1, is widely used as a pigment and colorant across several industries: as a pigment for paints, coatings, inks, and plastics; as a colorant and filler in cosmetics and personal care products; as a colorant for ceramic glazes and glass; as an abrasive and polishing material for metal finishing and sanding papers; as a catalyst support or active component in certain industrial processes; and as an adsorbent for filtration and environmental remediation.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1659.88
    methanol 2171.01
    isopropanol 1433.14
    water 961.51
    ethyl acetate 468.71
    n-propanol 1109.56
    acetone 1078.71
    n-butanol 959.18
    acetonitrile 679.44
    DMF 2884.63
    toluene 216.19
    isobutanol 775.74
    1,4-dioxane 1090.2
    methyl acetate 520.95
    THF 1991.15
    2-butanone 605.09
    n-pentanol 634.58
    sec-butanol 984.95
    n-hexane 170.67
    ethylene glycol 1205.79
    NMP 1233.86
    cyclohexane 137.92
    DMSO 1863.75
    n-butyl acetate 209.58
    n-octanol 366.06
    chloroform 593.72
    n-propyl acetate 339.0
    acetic acid 756.52
    dichloromethane 556.26
    cyclohexanone 407.16
    propylene glycol 1093.29
    isopropyl acetate 371.99
    DMAc 1774.53
    2-ethoxyethanol 1306.32
    isopentanol 687.06
    n-heptane 132.76
    ethyl formate 448.23
    1,2-dichloroethane 436.93
    n-hexanol 468.84
    2-methoxyethanol 2404.51
    isobutyl acetate 215.33
    tetrachloromethane 230.82
    n-pentyl acetate 211.8
    transcutol 1007.91
    n-heptanol 339.89
    ethylbenzene 148.95
    MIBK 420.93
    2-propoxyethanol 1059.42
    tert-butanol 1472.28
    MTBE 736.75
    2-butoxyethanol 615.81
    propionic acid 503.59
    o-xylene 204.26
    formic acid 871.89
    diethyl ether 915.03
    m-xylene 209.92
    p-xylene 154.69
    chlorobenzene 150.84
    dimethyl carbonate 538.49
    n-octane 68.26
    formamide 1239.59
    cyclopentanone 733.8
    2-pentanone 594.44
    anisole 402.41
    cyclopentyl methyl ether 919.55
    gamma-butyrolactone 744.55
    1-methoxy-2-propanol 1984.56
    pyridine 437.21
    3-pentanone 436.25
    furfural 600.57
    n-dodecane 58.29
    diethylene glycol 1161.38
    diisopropyl ether 334.72
    tert-amyl alcohol 986.3
    acetylacetone 531.92
    n-hexadecane 60.08
    acetophenone 283.78
    methyl propionate 583.26
    isopentyl acetate 176.54
    trichloroethylene 440.37
    n-nonanol 321.0
    cyclohexanol 608.94
    benzyl alcohol 340.2
    2-ethylhexanol 240.87
    isooctanol 260.26
    dipropyl ether 410.03
    1,2-dichlorobenzene 147.1
    ethyl lactate 361.76
    propylene carbonate 379.21
    n-methylformamide 1300.17
    2-pentanol 776.76
    n-pentane 270.17
    1-propoxy-2-propanol 678.58
    1-methoxy-2-propyl acetate 349.89
    2-(2-methoxypropoxy) propanol 460.05
    mesitylene 156.28
    ε-caprolactone 382.45
    p-cymene 110.11
    epichlorohydrin 847.07
    1,1,1-trichloroethane 353.07
    2-aminoethanol 1409.23
    morpholine-4-carbaldehyde 1194.65
    sulfolane 802.63
    2,2,4-trimethylpentane 106.58
    2-methyltetrahydrofuran 969.64
    n-hexyl acetate 283.86
    isooctane 97.59
    2-(2-butoxyethoxy)ethanol 591.11
    sec-butyl acetate 243.39
    tert-butyl acetate 435.35
    decalin 74.99
    glycerin 1438.99
    diglyme 909.92
    acrylic acid 473.42
    isopropyl myristate 165.65
    n-butyric acid 485.45
    acetyl acetate 257.94
    di(2-ethylhexyl) phthalate 138.23
    ethyl propionate 380.16
    nitromethane 1005.98
    1,2-diethoxyethane 385.84
    benzonitrile 217.63
    trioctyl phosphate 143.07
    1-bromopropane 350.76
    gamma-valerolactone 829.22
    n-decanol 253.15
    triethyl phosphate 151.89
    4-methyl-2-pentanol 439.51
    propionitrile 498.36
    vinylene carbonate 307.66
    1,1,2-trichlorotrifluoroethane 699.34
    DMS 224.23
    cumene 130.7
    2-octanol 279.79
    2-hexanone 373.47
    octyl acetate 207.81
    limonene 156.15
    1,2-dimethoxyethane 1414.99
    ethyl orthosilicate 162.59
    tributyl phosphate 134.73
    diacetone alcohol 678.41
    N,N-dimethylaniline 415.77
    acrylonitrile 538.31
    aniline 386.24
    1,3-propanediol 1320.79
    bromobenzene 125.73
    dibromomethane 410.5
    1,1,2,2-tetrachloroethane 478.43
    2-methyl-cyclohexyl acetate 175.1
    tetrabutyl urea 218.05
    diisobutyl methanol 189.78
    2-phenylethanol 281.1
    styrene 161.42
    dioctyl adipate 200.97
    dimethyl sulfate 683.69
    ethyl butyrate 221.39
    methyl lactate 631.05
    butyl lactate 238.18
    diethyl carbonate 161.39
    propanediol butyl ether 596.42
    triethyl orthoformate 205.61
    p-tert-butyltoluene 130.85
    methyl 4-tert-butylbenzoate 327.64
    morpholine 1348.49
    tert-butylamine 1000.75
    n-dodecanol 209.56
    dimethoxymethane 2049.06
    ethylene carbonate 295.11
    cyrene 498.42
    2-ethoxyethyl acetate 255.57
    2-ethylhexyl acetate 141.48
    1,2,4-trichlorobenzene 181.37
    4-methylpyridine 415.8
    dibutyl ether 250.05
    2,6-dimethyl-4-heptanol 189.78
    DEF 790.56
    dimethyl isosorbide 620.4
    tetrachloroethylene 336.77
    eugenol 407.8
    triacetin 249.56
    span 80 392.6
    1,4-butanediol 633.54
    1,1-dichloroethane 446.42
    2-methyl-1-pentanol 434.49
    methyl formate 870.9
    2-methyl-1-butanol 683.06
    n-decane 83.46
    butyronitrile 457.57
    3,7-dimethyl-1-octanol 265.27
    1-chlorooctane 169.29
    1-chlorotetradecane 96.66
    n-nonane 82.42
    undecane 67.76
    tert-butylcyclohexane 89.47
    cyclooctane 78.8
    cyclopentanol 874.16
    tetrahydropyran 804.94
    tert-amyl methyl ether 664.61
    2,5,8-trioxanonane 690.12
    1-hexene 300.13
    2-isopropoxyethanol 848.46
    2,2,2-trifluoroethanol 579.48
    methyl butyrate 402.17

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction