Sudan II

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  • Identifiers

    CAS number
    3118-97-6

    Molecular formula
    C18H16N2O

    SMILES
    CC1=CC(=C(C=C1)N=NC2=C(C=CC3=CC=CC=C32)O)C

    Safety labels

  • Odor profile

    Fragrance
    Floral 44.96%
    Fruity 39.72%
    Neroli 32.56%
    Sweet 30.53%
    Grape 30.05%
    Animal 29.68%
    Phenolic 26.09%
    Bitter 25.16%
    Burnt 24.75%
    Powdery 24.68%

     

    Flavor
    Bitter 81.45%
    Very strong 22.88%
    Indole 22.29%
    Nitrile 21.61%
    Flat 20.29%
    Moth ball 19.91%
    Cedarleaf 19.78%
    Naphthelene 19.78%
    Odorless 19.73%
    Scallion 19.6%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    5.3

    pKa est.
    7.65 (neutral)

    Molecular weight
    276.3 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    475°C

    Flash point

    • 231.96 ˚C est.

  • Synonyms

    • Sudan II
    • 3118-97-6
    • Solvent Orange 7
    • Sudan red
    • C.I. SOLVENT ORANGE 7
    • Ceres Orange RR
    • Fat Scarlet 2G
    • Fettorange B
    • Pyronalrot R
    • Sudan Orange
    • Sudan ax
    • Motirot G
    • Cerotinscharlach G
    • Sudan scarlet 6g
    • Sudan X
    • 2-Naphthalenol, 1-[(2,4-dimethylphenyl)azo]-
    • Cerisol Scarlet G
    • Resoform Orange R
    • Sudan Orange RPA
    • Sudan Orange RRA
    • Grasan Orange 3R
    • Lacquer Orange VR
    • Resin Scarlet 2R
    • Somalia Orange 2R
    • Waxakol vermilion L
    • Red B
    • Rot B
    • Rot GG fettloeslich
    • Orange Insoluble RR
    • Ponceau insoluble olg
    • Fat Red (yellowish)
    • 1-(2,4-Xylylazo)-2-naphthol
    • C.I.Solvent Orange 7
    • Sudan Red II
    • Red No. 5
    • Aizen Food Red No. 5
    • Japan Red 5
    • Somalia Orange A2R
    • A.F. Red No. 5
    • Japan Red 505
    • FD and C Red No. 32
    • 1-(o-Xylylazo)-2-naphthol
    • Sudan 2
    • 1-(2,4-Dimethylphenylazo)-2-naphthol
    • Sudan-Ii-D6
    • Oranz rozpoustedlova 7
    • Soudan II
    • Ceres oranges RR
    • C.I. 12140
    • 2-Naphthol, 1-(2,4-xylylazo)-
    • 1-[(2,4-dimethylphenyl)diazenyl]naphthalen-2-ol
    • CI 12140
    • 1-((2,4-Dimethylphenyl)azo)-2-naphthalenol
    • AF Red No. 5
    • 2-Naphthalenol, 1-((2,4-dimethylphenyl)azo)-
    • 8C1M5O3ECT
    • Ext D and C Red No. 14
    • DTXSID5040706
    • Sudan 2;Sudan II;Sudan Orange RPA
    • MFCD00003896
    • NSC-10457
    • 1-[(2,4-Dimethylphenyl)azo]-2-naphthalenol
    • Waxakol vermilion
    • 1-((2,4-Dimethylphenyl)diazenyl)naphthalen-2-ol
    • (E)-1-((2,4-dimethylphenyl)diazenyl)naphthalen-2-ol
    • 1-[(E)-(2,4-dimethylphenyl)diazenyl]naphthalen-2-ol
    • 2-Naphthalenol, 1-(2-(2,4-dimethylphenyl)diazenyl)-
    • A F Red No. 5
    • Color Index No: 12140
    • CCRIS 906
    • Fat Red (Yellowish) (VAN)
    • Ext D & C Red No. 14
    • Oranz rozpoustedlova 7 [Czech]
    • Ext D and C Red. No. 14
    • FD & C No. 32
    • HSDB 6365
    • EINECS 221-490-4
    • NSC 10457
    • UNII-8C1M5O3ECT
    • 2-Naphthalenol, 1-[2-(2,4-dimethylphenyl)diazenyl]-
    • AI3-02853
    • SudanRedII
    • sudan2
    • Japan Red No.5
    • Tolnaftate Impurity 6
    • Somalia Orange A 2R
    • SUDAN II [IARC]
    • 2-Naphthol,4-xylylazo)-
    • Red 505
    • SCHEMBL338695
    • Sudan II, analytical standard
    • AKA505
    • orb1297157
    • SCHEMBL2312130
    • SCHEMBL4159058
    • Sudan II, Dye content 90 %
    • CHEMBL1552233
    • SCHEMBL11876770
    • SCHEMBL29356344
    • CHEBI:82534
    • DTXCID50809863
    • DTXSID80859795
    • MSK2402
    • JBTHDAVBDKKSRW-FMQUCBEESA-N
    • JBTHDAVBDKKSRW-UHFFFAOYSA-N
    • 1-(2,4-Xylidylazo)-2-naphthol
    • HY-D0928
    • NSC10457
    • Tox21_303836
    • s6240
    • SBB057638
    • STL280475
    • AKOS003581978
    • AKOS028109392
    • 2-Naphthalenol,4-dimethylphenyl)azo]-
    • FD&C RED NO. 32 (DELISTED)
    • WLN: L66J BNUNR B1 D1& CQ
    • C.I. SOLVENT ORANGE 7 [HSDB]
    • Sudan 2; Sudan II; Sudan Orange RPA
    • NCGC00164083-01
    • NCGC00357109-01
    • Sudan 2 100 microg/mL in Acetonitrile
    • AC-34717
    • NCI60_000109
    • 1-(2,4-dimethylphenyl)azonaphthalen-2-ol
    • CAS-3118-97-6
    • CS-0016870
    • 3118-97-6

  • Applications

    Sudan II (CAS 3118-97-6) is a fat-soluble azo dye used primarily as a solvent-based colorant in industrial applications. It is commonly employed to color oils, fats, waxes, and lubricants, including hydrocarbon-based formulations in manufacturing and product finishing. It also functions as a color additive in coatings and solvent-based inks, aiding product differentiation and quality control. In plastics and polymer formulations, Sudan II can be used as a colorant to achieve specific hues in resin systems. In analytical settings, it may be used as a lipid-staining marker or test dye for lipid-containing samples, subject to safety considerations and regulatory constraints.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 13.46
    methanol 14.26
    isopropanol 6.52
    water 0.0
    ethyl acetate 105.24
    n-propanol 16.26
    acetone 65.51
    n-butanol 17.22
    acetonitrile 20.48
    DMF 176.19
    toluene 120.53
    isobutanol 10.37
    1,4-dioxane 172.28
    methyl acetate 98.1
    THF 414.8
    2-butanone 111.36
    n-pentanol 13.41
    sec-butanol 11.1
    n-hexane 2.29
    ethylene glycol 1.3
    NMP 129.19
    cyclohexane 2.47
    DMSO 93.8
    n-butyl acetate 84.51
    n-octanol 4.35
    chloroform 305.6
    n-propyl acetate 60.33
    acetic acid 24.71
    dichloromethane 413.24
    cyclohexanone 133.01
    propylene glycol 2.85
    isopropyl acetate 70.56
    DMAc 219.39
    2-ethoxyethanol 44.49
    isopentanol 19.54
    n-heptane 2.14
    ethyl formate 26.61
    1,2-dichloroethane 381.41
    n-hexanol 19.29
    2-methoxyethanol 76.53
    isobutyl acetate 40.45
    tetrachloromethane 8.96
    n-pentyl acetate 30.68
    transcutol 403.05
    n-heptanol 7.75
    ethylbenzene 37.46
    MIBK 62.46
    2-propoxyethanol 80.35
    tert-butanol 15.05
    MTBE 58.35
    2-butoxyethanol 33.15
    propionic acid 20.07
    o-xylene 36.09
    formic acid 6.45
    diethyl ether 101.08
    m-xylene 43.89
    p-xylene 35.95
    chlorobenzene 115.3
    dimethyl carbonate 69.91
    n-octane 0.71
    formamide 23.67
    cyclopentanone 232.27
    2-pentanone 87.94
    anisole 106.58
    cyclopentyl methyl ether 121.67
    gamma-butyrolactone 236.35
    1-methoxy-2-propanol 56.93
    pyridine 238.33
    3-pentanone 91.64
    furfural 178.25
    n-dodecane 0.53
    diethylene glycol 34.95
    diisopropyl ether 21.4
    tert-amyl alcohol 18.27
    acetylacetone 142.03
    n-hexadecane 0.66
    acetophenone 72.32
    methyl propionate 110.78
    isopentyl acetate 80.25
    trichloroethylene 703.18
    n-nonanol 5.6
    cyclohexanol 16.15
    benzyl alcohol 39.56
    2-ethylhexanol 15.8
    isooctanol 8.43
    dipropyl ether 49.38
    1,2-dichlorobenzene 93.2
    ethyl lactate 20.22
    propylene carbonate 77.36
    n-methylformamide 46.44
    2-pentanol 11.79
    n-pentane 1.45
    1-propoxy-2-propanol 50.04
    1-methoxy-2-propyl acetate 129.43
    2-(2-methoxypropoxy) propanol 57.04
    mesitylene 18.7
    ε-caprolactone 116.16
    p-cymene 15.92
    epichlorohydrin 583.8
    1,1,1-trichloroethane 129.12
    2-aminoethanol 5.72
    morpholine-4-carbaldehyde 189.51
    sulfolane 203.93
    2,2,4-trimethylpentane 1.8
    2-methyltetrahydrofuran 161.81
    n-hexyl acetate 31.61
    isooctane 1.63
    2-(2-butoxyethoxy)ethanol 75.8
    sec-butyl acetate 49.68
    tert-butyl acetate 94.37
    decalin 3.09
    glycerin 8.03
    diglyme 235.03
    acrylic acid 21.83
    isopropyl myristate 17.25
    n-butyric acid 38.47
    acetyl acetate 54.17
    di(2-ethylhexyl) phthalate 16.94
    ethyl propionate 67.42
    nitromethane 124.1
    1,2-diethoxyethane 147.99
    benzonitrile 47.98
    trioctyl phosphate 9.12
    1-bromopropane 118.1
    gamma-valerolactone 292.84
    n-decanol 4.48
    triethyl phosphate 31.17
    4-methyl-2-pentanol 11.69
    propionitrile 30.26
    vinylene carbonate 77.44
    1,1,2-trichlorotrifluoroethane 134.05
    DMS 76.34
    cumene 17.49
    2-octanol 4.46
    2-hexanone 59.81
    octyl acetate 18.28
    limonene 21.08
    1,2-dimethoxyethane 163.88
    ethyl orthosilicate 30.17
    tributyl phosphate 15.5
    diacetone alcohol 70.39
    N,N-dimethylaniline 49.38
    acrylonitrile 54.17
    aniline 78.53
    1,3-propanediol 14.5
    bromobenzene 146.99
    dibromomethane 200.64
    1,1,2,2-tetrachloroethane 404.05
    2-methyl-cyclohexyl acetate 47.28
    tetrabutyl urea 20.84
    diisobutyl methanol 13.89
    2-phenylethanol 48.97
    styrene 51.7
    dioctyl adipate 31.61
    dimethyl sulfate 103.71
    ethyl butyrate 67.85
    methyl lactate 30.21
    butyl lactate 21.64
    diethyl carbonate 43.83
    propanediol butyl ether 17.98
    triethyl orthoformate 48.0
    p-tert-butyltoluene 16.67
    methyl 4-tert-butylbenzoate 48.35
    morpholine 202.0
    tert-butylamine 9.05
    n-dodecanol 3.73
    dimethoxymethane 222.35
    ethylene carbonate 54.97
    cyrene 46.85
    2-ethoxyethyl acetate 84.14
    2-ethylhexyl acetate 62.81
    1,2,4-trichlorobenzene 117.51
    4-methylpyridine 195.51
    dibutyl ether 24.98
    2,6-dimethyl-4-heptanol 13.89
    DEF 125.91
    dimethyl isosorbide 157.03
    tetrachloroethylene 170.97
    eugenol 47.22
    triacetin 49.32
    span 80 31.02
    1,4-butanediol 3.65
    1,1-dichloroethane 155.28
    2-methyl-1-pentanol 19.3
    methyl formate 40.48
    2-methyl-1-butanol 18.49
    n-decane 0.86
    butyronitrile 25.74
    3,7-dimethyl-1-octanol 10.14
    1-chlorooctane 6.46
    1-chlorotetradecane 2.98
    n-nonane 0.72
    undecane 0.65
    tert-butylcyclohexane 3.44
    cyclooctane 1.19
    cyclopentanol 16.4
    tetrahydropyran 143.85
    tert-amyl methyl ether 54.08
    2,5,8-trioxanonane 141.49
    1-hexene 17.2
    2-isopropoxyethanol 34.07
    2,2,2-trifluoroethanol 8.92
    methyl butyrate 72.37

    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