Pigment Red 51

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  • Identifiers

    CAS number
    5850-87-3

    Molecular formula
    C34H26BaN4O8S2

    SMILES
    CC1=C(C=CC(=C1)N=NC2=C(C=CC3=CC=CC=C32)O)S(=O)(=O)[O-].CC1=C(C=CC(=C1)N=NC2=C(C=CC3=CC=CC=C32)O)S(=O)(=O)[O-].[Ba+2]

    Safety labels

  • Odor profile

    Fragrance
    Odorless 68.74%
    Cooked 25.12%
    Bitter 23.95%
    Savory 22.52%
    Grape 20.54%
    Burnt 20.03%
    Roasted 19.95%
    Meaty 19.64%
    Fruity 16.88%
    Milky 16.05%

     

    Flavor
    Bitter 90.2%
    Odorless 30.63%
    Nitrile 21.08%
    Very strong 19.51%
    Indole 19.11%
    Bread crust 18.8%
    Taco 18.73%
    Bland 18.58%
    Roasted peanuts 18.32%
    Moth ball 18.16%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    6.25 (neutral)

    Molecular weight
    820.1 g/mol

    Flash point

    • 253.45 ˚C est.

  • Synonyms

    • Benzenesulfonic acid, 4-[(2-hydroxy-1-naphthalenyl)azo]-2-methyl-, barium salt (2:1)
    • O4M4O2734M
    • CI 15580
    • DTXSID7064025
    • Benzenesulfonic acid, 4-((2-hydroxy-1-naphthalenyl)azo)-2-methyl-, barium salt (2:1)
    • Benzenesulfonic acid, 4-(2-(2-hydroxy-1-naphthalenyl)diazenyl)-2-methyl-, barium salt (2:1)
    • Benzenesulfonic acid, 4-[2-(2-hydroxy-1-naphthalenyl)diazenyl]-2-methyl-, barium salt (2:1)
    • RefChem:863200
    • DTXCID0042408
    • CI 15580 [INCI]
    • Avival Red
    • C.I. 14940
    • C.I. Acid Red 22, disodium salt
    • 5850-87-3
    • Barium bis[4-[(2-hydroxy-1-naphthyl)azo]-2-methylbenzenesulphonate]
    • Barium bis(4-((2-hydroxy-1-naphthyl)azo)-2-methylbenzenesulphonate)
    • barium(2+);4-[(2-hydroxynaphthalen-1-yl)diazenyl]-2-methylbenzenesulfonate
    • EINECS 227-459-1
    • C.I. 15580
    • UNII-O4M4O2734M
    • SCHEMBL29394555
    • PWTBDGVCDRNYRU-GKJZQFSSSA-L
    • DB-273512
    • NS00047143
    • Q27893475
    • Barium bis{4-[(2-hydroxynaphthalen-1-yl)diazenyl]-2-methylbenzene-1-sulfonate}
    • 5850-87-3

  • Applications

    Pigment Red 51 (CAS 5850-87-3) is an organic pigment with good lightfastness, used primarily as a colorant in coatings and paints, providing red to reddish-brown hues for industrial and decorative applications. It is commonly incorporated into polymer systems as a colorant in masterbatches and plastic products to ensure uniform coloration. In the printing and packaging sector, the pigment is used in inks and in decorative coatings for packaging materials and substrates. In textiles, it is employed for fabric printing and coloration. In adhesive and sealant formulations, the pigment can be used as a stable colorant within bonding systems.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1.32
    methanol 1.59
    isopropanol 0.96
    water 0.0
    ethyl acetate 3.55
    n-propanol 1.64
    acetone 7.88
    n-butanol 1.51
    acetonitrile 1.41
    DMF 32.4
    toluene 1.91
    isobutanol 0.75
    1,4-dioxane 14.42
    methyl acetate 4.57
    THF 58.11
    2-butanone 12.75
    n-pentanol 1.33
    sec-butanol 1.78
    n-hexane 0.03
    ethylene glycol 0.33
    NMP 22.59
    cyclohexane 0.07
    DMSO 20.4
    n-butyl acetate 5.08
    n-octanol 0.75
    chloroform 4.32
    n-propyl acetate 3.78
    acetic acid 2.77
    dichloromethane 4.71
    cyclohexanone 19.5
    propylene glycol 1.01
    isopropyl acetate 3.46
    DMAc 35.58
    2-ethoxyethanol 6.7
    isopentanol 1.13
    n-heptane 0.07
    ethyl formate 2.2
    1,2-dichloroethane 4.03
    n-hexanol 1.67
    2-methoxyethanol 14.62
    isobutyl acetate 1.86
    tetrachloromethane 0.13
    n-pentyl acetate 3.83
    transcutol 39.49
    n-heptanol 1.23
    ethylbenzene 0.72
    MIBK 4.28
    2-propoxyethanol 14.35
    tert-butanol 1.57
    MTBE 2.12
    2-butoxyethanol 7.08
    propionic acid 1.93
    o-xylene 0.84
    formic acid 1.2
    diethyl ether 2.32
    m-xylene 0.8
    p-xylene 0.95
    chlorobenzene 1.98
    dimethyl carbonate 3.53
    n-octane 0.05
    formamide 4.29
    cyclopentanone 31.27
    2-pentanone 7.95
    anisole 4.05
    cyclopentyl methyl ether 5.26
    gamma-butyrolactone 20.46
    1-methoxy-2-propanol 13.13
    pyridine 13.74
    3-pentanone 5.78
    furfural 19.66
    n-dodecane 0.06
    diethylene glycol 7.43
    diisopropyl ether 0.53
    tert-amyl alcohol 1.95
    acetylacetone 14.13
    n-hexadecane 0.07
    acetophenone 5.2
    methyl propionate 4.51
    isopentyl acetate 4.49
    trichloroethylene 13.28
    n-nonanol 1.05
    cyclohexanol 1.76
    benzyl alcohol 3.22
    2-ethylhexanol 1.16
    isooctanol 1.05
    dipropyl ether 2.63
    1,2-dichlorobenzene 1.75
    ethyl lactate 3.2
    propylene carbonate 5.87
    n-methylformamide 6.2
    2-pentanol 1.06
    n-pentane 0.03
    1-propoxy-2-propanol 10.61
    1-methoxy-2-propyl acetate 11.22
    2-(2-methoxypropoxy) propanol 11.02
    mesitylene 0.46
    ε-caprolactone 11.85
    p-cymene 0.75
    epichlorohydrin 29.19
    1,1,1-trichloroethane 1.5
    2-aminoethanol 1.07
    morpholine-4-carbaldehyde 30.81
    sulfolane 33.45
    2,2,4-trimethylpentane 0.04
    2-methyltetrahydrofuran 10.82
    n-hexyl acetate 3.62
    isooctane 0.03
    2-(2-butoxyethoxy)ethanol 13.98
    sec-butyl acetate 2.69
    tert-butyl acetate 5.51
    decalin 0.06
    glycerin 3.05
    diglyme 27.58
    acrylic acid 2.28
    isopropyl myristate 2.45
    n-butyric acid 3.13
    acetyl acetate 3.04
    di(2-ethylhexyl) phthalate 2.78
    ethyl propionate 3.39
    nitromethane 12.45
    1,2-diethoxyethane 10.62
    benzonitrile 3.55
    trioctyl phosphate 1.7
    1-bromopropane 1.44
    gamma-valerolactone 47.57
    n-decanol 0.89
    triethyl phosphate 2.56
    4-methyl-2-pentanol 0.7
    propionitrile 1.95
    vinylene carbonate 5.87
    1,1,2-trichlorotrifluoroethane 15.5
    DMS 5.22
    cumene 0.44
    2-octanol 0.81
    2-hexanone 6.57
    octyl acetate 2.81
    limonene 1.15
    1,2-dimethoxyethane 20.55
    ethyl orthosilicate 2.36
    tributyl phosphate 2.33
    diacetone alcohol 9.93
    N,N-dimethylaniline 2.47
    acrylonitrile 3.92
    aniline 2.62
    1,3-propanediol 2.5
    bromobenzene 1.79
    dibromomethane 2.15
    1,1,2,2-tetrachloroethane 8.19
    2-methyl-cyclohexyl acetate 4.32
    tetrabutyl urea 4.99
    diisobutyl methanol 1.09
    2-phenylethanol 4.74
    styrene 1.01
    dioctyl adipate 4.92
    dimethyl sulfate 7.29
    ethyl butyrate 4.57
    methyl lactate 5.26
    butyl lactate 4.99
    diethyl carbonate 2.68
    propanediol butyl ether 5.33
    triethyl orthoformate 4.18
    p-tert-butyltoluene 0.82
    methyl 4-tert-butylbenzoate 7.16
    morpholine 17.76
    tert-butylamine 0.59
    n-dodecanol 0.72
    dimethoxymethane 18.88
    ethylene carbonate 3.9
    cyrene 10.48
    2-ethoxyethyl acetate 9.03
    2-ethylhexyl acetate 3.39
    1,2,4-trichlorobenzene 3.01
    4-methylpyridine 7.97
    dibutyl ether 2.12
    2,6-dimethyl-4-heptanol 1.09
    DEF 8.75
    dimethyl isosorbide 23.21
    tetrachloroethylene 3.23
    eugenol 8.89
    triacetin 7.38
    span 80 8.14
    1,4-butanediol 0.65
    1,1-dichloroethane 1.95
    2-methyl-1-pentanol 1.25
    methyl formate 5.03
    2-methyl-1-butanol 1.19
    n-decane 0.09
    butyronitrile 2.01
    3,7-dimethyl-1-octanol 1.14
    1-chlorooctane 0.54
    1-chlorotetradecane 0.31
    n-nonane 0.06
    undecane 0.07
    tert-butylcyclohexane 0.05
    cyclooctane 0.03
    cyclopentanol 2.52
    tetrahydropyran 9.05
    tert-amyl methyl ether 2.27
    2,5,8-trioxanonane 22.49
    1-hexene 0.28
    2-isopropoxyethanol 3.96
    2,2,2-trifluoroethanol 0.97
    methyl butyrate 4.74

    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