Acid orange 7

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  • Identifiers

    CAS number
    633-96-5

    Molecular formula
    C16H11N2NaO4S

    SMILES
    C1=CC=C2C(=C1)C=CC(=C2N=NC3=CC=C(C=C3)S(=O)(=O)[O-])O.[Na+]

  • Odor profile

    Fragrance
    Odorless 71.65%
    Cooked 26.34%
    Bitter 24.16%
    Savory 22.98%
    Burnt 21.76%
    Roasted 19.92%
    Meaty 18.64%
    Grape 17.04%
    Fruity 15.47%
    Pungent 15.29%

     

    Flavor
    Bitter 88.28%
    Odorless 30.89%
    Nitrile 21.35%
    Very strong 19.54%
    Indole 19.21%
    Bread crust 18.97%
    Taco 18.85%
    Moth ball 18.47%
    Bland 18.42%
    Roasted peanuts 18.36%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    6.49 (neutral)

    Molecular weight
    350.3 g/mol

    Flash point

    • 255.32 ˚C est.

  • Synonyms

    • Acid orange 7
    • 633-96-5
    • Orange II
    • C.I. Acid Orange 7
    • Acid Orange A
    • Orange II sodium salt
    • Acid Orange
    • Acid orange ii
    • D&C Orange No. 4
    • Colacid Orange
    • Fenazo Orange
    • Persian Orange
    • Curol Orange
    • Solar Orange
    • Mandarin G
    • Tropaeolin OOO
    • Amacid Orange Y
    • Orange Y
    • Orange Extra N
    • Orange Extra P
    • Bucacid Orange A
    • C.I. Acid Orange 7, monosodium salt
    • Kiton Orange II
    • Lake Orange A
    • Lurazol Orange E
    • Nubilon Orange R
    • Orange YA
    • Orange YZ
    • Perca Orange GR
    • Persian Orange X
    • Special Orange H
    • Erio Orange II
    • Java Orange II
    • Orange
    • Orange IIC
    • Orange IIP
    • Orange IIS
    • Acilan Orange II
    • Diacid Orange II
    • Orange IISM
    • Brasilan Orange A
    • Calcocid Orange Y
    • Betanaphthol Orange
    • Orange Toner GRT
    • Hidacid Orange II
    • Special Orange GR
    • Tropaeolin OOO 2
    • Airedale Orange II
    • Hispacid Orange AF
    • Neklacid Orange II
    • Peeracid Orange II
    • Vondacid Orange II
    • CI 15510
    • Persian Orange Lake
    • Pure Orange II S
    • Certiqual Orange II
    • Tertracid Orange II
    • Leather Orange Extra
    • Lutetia Orange 3JR
    • Naphthalene Orange G
    • Lake Orange II YS
    • Naphtocard Orange II
    • Orange II for Lakes
    • D&C Orange 4
    • Atul Acid Orange II
    • Orange 2 sodium salt
    • Rifa Acid Orange II
    • Nitto Acid Orange II
    • 2-Naphthol Orange II
    • Kayaku Acid Orange II
    • Mitsui Acid Orange II
    • Orange No. 205
    • Symulon Acid Orange II
    • Takaoka Acid Orange II
    • ORANGEI
    • 11550 Orange
    • Acid Leather Orange PRW
    • Symuler Orange Lake 43
    • Tangarine Lake X-917
    • Kromon Lake Orange Toner
    • No. 177 Orange Lake
    • Acid Leather Orange Extra
    • Naphthalene Lake Orange G
    • D and C Orange No. 4
    • MFCD00011657
    • Q1LIY3BO0U
    • Orange II Special For Lacquer
    • C.I. 15510
    • DTXSID0038881
    • sodium (E)-4-((2-hydroxynaphthalen-1-yl)diazenyl)benzenesulfonate
    • 1-p-Sulfophenylazo-2-naphthol, monosodium salt
    • 4-(2-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt
    • Benzenesulfonic acid, 4-[(2-hydroxy-1-naphthalenyl)azo]-, monosodiumsalt
    • beta-Naphthyl orange
    • Tropaeolin 000 No. 2
    • Acid Orange 7 (Technical Grade)
    • Tropaeolin OOO No. 2
    • Oranz kysela 7 [Czech]
    • D & C Orange no. 4
    • Orange 2 sodium
    • Oranz kysela 7
    • 2-naphthol orange
    • Acid Leather Orange Extra G
    • Tropoclin OOO2 (Indicator)
    • 1016649-40-3
    • NSC-9853
    • Acid Leather Orange Extra PRW
    • CCRIS 2427
    • NSC-101008
    • NSC 9853
    • ORANGE 4
    • EINECS 211-199-0
    • UNII-Q1LIY3BO0U
    • NSC 101008
    • p-(2-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt
    • Tropaeolin OOO-2
    • Orange II Certifed
    • Orange 2 sodium 100 microg/mL in Water
    • 4-((2-Hydroxy-1-naphthyl)azo)benzenesulfonic acid, sodium salt
    • p-((2-Hydroxy-1-naphthyl)azo)benzenesulfonic acid sodium salt
    • ORANGE II [MI]
    • DAIDAI205
    • DC ORANGE NO. 4
    • Acid orange 7 (Standard)
    • EC 211-199-0
    • SCHEMBL144504
    • Sodium 4-((2-hydroxy-1-naphthyl)azo)benzenesulphonate
    • CHEMBL2028473

  • Applications

    Acid orange 7 (CAS 633-96-5) is a soluble azo dye primarily used as a colorant for textiles, especially on protein fibers such as wool and silk (and may be used for nylon). It is also employed for leather dyeing and as a colorant in industrial inks and coatings, as well as in plastics and polymer formulations. Additionally, as an azo dye intermediate, it is used in the synthesis of other azo dyes. Its use is subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1.4
    methanol 1.51
    isopropanol 0.99
    water 0.0
    ethyl acetate 3.95
    n-propanol 1.69
    acetone 7.53
    n-butanol 1.42
    acetonitrile 2.05
    DMF 22.06
    toluene 1.76
    isobutanol 0.71
    1,4-dioxane 12.87
    methyl acetate 6.18
    THF 45.59
    2-butanone 15.3
    n-pentanol 1.39
    sec-butanol 2.39
    n-hexane 0.01
    ethylene glycol 0.53
    NMP 11.43
    cyclohexane 0.04
    DMSO 11.23
    n-butyl acetate 4.21
    n-octanol 1.55
    chloroform 1.49
    n-propyl acetate 3.96
    acetic acid 3.36
    dichloromethane 2.11
    cyclohexanone 15.84
    propylene glycol 1.35
    isopropyl acetate 4.06
    DMAc 41.47
    2-ethoxyethanol 8.32
    isopentanol 1.12
    n-heptane 0.06
    ethyl formate 2.41
    1,2-dichloroethane 2.04
    n-hexanol 1.63
    2-methoxyethanol 15.48
    isobutyl acetate 1.66
    tetrachloromethane 0.07
    n-pentyl acetate 4.96
    transcutol 65.38
    n-heptanol 1.75
    ethylbenzene 0.69
    MIBK 4.28
    2-propoxyethanol 13.31
    tert-butanol 1.44
    MTBE 2.56
    2-butoxyethanol 8.66
    propionic acid 2.41
    o-xylene 0.94
    formic acid 1.66
    diethyl ether 2.36
    m-xylene 0.81
    p-xylene 0.81
    chlorobenzene 1.13
    dimethyl carbonate 3.71
    n-octane 0.05
    formamide 6.67
    cyclopentanone 21.56
    2-pentanone 7.8
    anisole 4.13
    cyclopentyl methyl ether 4.44
    gamma-butyrolactone 15.6
    1-methoxy-2-propanol 13.25
    pyridine 11.96
    3-pentanone 5.72
    furfural 14.72
    n-dodecane 0.08
    diethylene glycol 7.74
    diisopropyl ether 0.54
    tert-amyl alcohol 2.59
    acetylacetone 15.03
    n-hexadecane 0.1
    acetophenone 5.52
    methyl propionate 5.05
    isopentyl acetate 4.15
    trichloroethylene 7.4
    n-nonanol 2.11
    cyclohexanol 1.88
    benzyl alcohol 3.33
    2-ethylhexanol 1.29
    isooctanol 1.47
    dipropyl ether 2.53
    1,2-dichlorobenzene 1.1
    ethyl lactate 3.39
    propylene carbonate 5.07
    n-methylformamide 5.81
    2-pentanol 1.33
    n-pentane 0.02
    1-propoxy-2-propanol 10.06
    1-methoxy-2-propyl acetate 10.54
    2-(2-methoxypropoxy) propanol 13.87
    mesitylene 0.47
    ε-caprolactone 10.86
    p-cymene 0.84
    epichlorohydrin 20.69
    1,1,1-trichloroethane 0.64
    2-aminoethanol 1.32
    morpholine-4-carbaldehyde 25.21
    sulfolane 17.01
    2,2,4-trimethylpentane 0.04
    2-methyltetrahydrofuran 8.86
    n-hexyl acetate 5.33
    isooctane 0.02
    2-(2-butoxyethoxy)ethanol 19.45
    sec-butyl acetate 2.96
    tert-butyl acetate 6.0
    decalin 0.04
    glycerin 3.65
    diglyme 33.99
    acrylic acid 2.73
    isopropyl myristate 2.98
    n-butyric acid 3.2
    acetyl acetate 3.48
    di(2-ethylhexyl) phthalate 2.96
    ethyl propionate 3.31
    nitromethane 13.05
    1,2-diethoxyethane 13.99
    benzonitrile 3.64
    trioctyl phosphate 1.86
    1-bromopropane 0.64
    gamma-valerolactone 35.76
    n-decanol 1.68
    triethyl phosphate 2.23
    4-methyl-2-pentanol 0.76
    propionitrile 2.17
    vinylene carbonate 4.75
    1,1,2-trichlorotrifluoroethane 12.26
    DMS 5.72
    cumene 0.43
    2-octanol 1.47
    2-hexanone 6.26
    octyl acetate 3.6
    limonene 1.15
    1,2-dimethoxyethane 20.56
    ethyl orthosilicate 2.17
    tributyl phosphate 2.33
    diacetone alcohol 10.64
    N,N-dimethylaniline 2.67
    acrylonitrile 4.42
    aniline 2.79
    1,3-propanediol 2.8
    bromobenzene 0.89
    dibromomethane 0.8
    1,1,2,2-tetrachloroethane 4.5
    2-methyl-cyclohexyl acetate 3.83
    tetrabutyl urea 5.38
    diisobutyl methanol 1.23
    2-phenylethanol 4.59
    styrene 0.96
    dioctyl adipate 5.29
    dimethyl sulfate 6.26
    ethyl butyrate 3.91
    methyl lactate 5.83
    butyl lactate 5.92
    diethyl carbonate 2.48
    propanediol butyl ether 8.12
    triethyl orthoformate 3.93
    p-tert-butyltoluene 0.89
    methyl 4-tert-butylbenzoate 8.04
    morpholine 15.31
    tert-butylamine 0.51
    n-dodecanol 1.28
    dimethoxymethane 16.68
    ethylene carbonate 3.18
    cyrene 9.51
    2-ethoxyethyl acetate 11.37
    2-ethylhexyl acetate 2.84
    1,2,4-trichlorobenzene 2.13
    4-methylpyridine 7.26
    dibutyl ether 3.23
    2,6-dimethyl-4-heptanol 1.23
    DEF 10.05
    dimethyl isosorbide 22.59
    tetrachloroethylene 2.09
    eugenol 9.86
    triacetin 9.26
    span 80 9.61
    1,4-butanediol 0.82
    1,1-dichloroethane 0.89
    2-methyl-1-pentanol 1.39
    methyl formate 4.6
    2-methyl-1-butanol 1.33
    n-decane 0.13
    butyronitrile 1.86
    3,7-dimethyl-1-octanol 1.85
    1-chlorooctane 0.79
    1-chlorotetradecane 0.4
    n-nonane 0.09
    undecane 0.1
    tert-butylcyclohexane 0.04
    cyclooctane 0.02
    cyclopentanol 2.05
    tetrahydropyran 7.43
    tert-amyl methyl ether 2.86
    2,5,8-trioxanonane 27.09
    1-hexene 0.16
    2-isopropoxyethanol 5.19
    2,2,2-trifluoroethanol 1.24
    methyl butyrate 4.7

    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