C.I. Pigment Red 49

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  • Identifiers

    CAS number
    1248-18-6

    Molecular formula
    C20H13N2NaO4S

    SMILES
    C1=CC=C2C(=C1)C=CC(=C2N=NC3=C(C4=CC=CC=C4C=C3)S(=O)(=O)[O-])O.[Na+]

    Safety labels

  • Odor profile

    Fragrance
    Odorless 62.92%
    Fruity 27.4%
    Grape 24.41%
    Cooked 24.37%
    Bitter 24.02%
    Savory 19.15%
    Burnt 18.47%
    Neroli 15.67%
    Pungent 15.2%
    Fatty 14.85%

     

    Flavor
    Bitter 91.92%
    Odorless 28.07%
    Nitrile 20.66%
    Very strong 18.98%
    Indole 18.71%
    Moth ball 18.06%
    Taco 17.72%
    Bread crust 17.71%
    Naphthelene 17.54%
    Lovage 17.47%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    5.91 (weak acid)

    Molecular weight
    400.4 g/mol

    Flash point

    • 275.16 ˚C est.

  • Synonyms

    • 1248-18-6
    • Sodium 2-[(2-Hydroxynaphthyl)Azo]Naphthalenesulphonate
    • Lithol Red R
    • Sodium lithol
    • Lithol Red
    • Resamine Red RC
    • Lithol Toner
    • Sunburst Red
    • Signal Red
    • Brasilaca Red R
    • Lithol Red Lake
    • Monolite Red R
    • Ohio Red
    • Vulcafix Red R
    • Britone Red Y
    • Graphic Red Y
    • Irgalite Red RL
    • Lithol Red sodium salt
    • Lutetia Red R
    • Resamine Red RB
    • Segnale Red R
    • Siloton Red R
    • Lithol Red Toner
    • Lithol Red B
    • New York Red
    • Sodium Lithol Red
    • Light Red RS
    • Recolite Red LYS
    • D & C Red No. 10
    • Lake Red R
    • Lake Red RL
    • Lithol Red 3GS
    • Uulcol Scarlet 2G
    • Plastoresin Red SR
    • Kromon sodium lithol
    • Certiqual Lithol Red
    • D and C Red No. 10
    • Red No. 205
    • Lithol Red RB Extra
    • Lithol Red 3580
    • Lithol Red 17676
    • Lithol Red RL 151
    • Carnelio Pale Lithol Red
    • Undeveldoped Lithol Toner
    • Lithol Toner YA 8003
    • D&C Red No. 10
    • Eljon Lithol Red No. 10
    • Oralith Red SR Water Soluble
    • CCRIS 2428
    • 11935 Red
    • IY4YV0PVDA
    • Sodium Lithol Red 20-4018
    • Lithol Toner Extra Light 5000
    • CI 15630
    • Lithol Toner Sodium Salt RT 314
    • C.I. 15630
    • EINECS 214-998-2
    • ENIALIT RED R
    • RW LITHOL RED R
    • AKA205
    • 1-NAPHTHALENESULFONIC ACID, 2-((2-HYDROXY-1-NAPHTHALENYL)AZO)-, MONOSODIUM SALT
    • Sodium 2-((2-hydroxynaphthyl)azo)naphthalenesulphonate
    • D&C RED NO. 10 (DELISTED)
    • Sodium 2-((2-hydroxy-1-naphthalenyl)azo)-1-naphthalenesulfonate
    • 1-Naphthalenesulfonic acid, 2-(2-(2-hydroxy-1-naphthalenyl)diazenyl)-, sodium salt (1:1)
    • 1-Naphthalenesulfonic acid, 2-[(2-hydroxy-1-naphthalenyl)azo]-, monosodium salt
    • 1-Naphthalenesulfonic acid, 2-[2-(2-hydroxy-1-naphthalenyl)diazenyl]-, sodium salt (1:1)
    • RefChem:572554
    • AKA205 [INCI]
    • CI 15630 [INCI]
    • sodium;2-[(2-hydroxynaphthalen-1-yl)diazenyl]naphthalene-1-sulfonate
    • sodium 2-[(E)-(2-hydroxynaphthalen-1-yl)diazenyl]naphthalene-1-sulfonate
    • sodium 2-[2-(2-hydroxynaphthalen-1-yl)diazen-1-yl]naphthalene-1-sulfonate
    • UNII-IY4YV0PVDA
    • D&C Red 10
    • SCHEMBL341772
    • SCHEMBL9577828
    • SCHEMBL9577831
    • DTXSID2021230
    • SCHEMBL29353946
    • MSK2489
    • MGIYYNDGQBDWFE-GXTSIBQPSA-M
    • Pigment red 49(c.i. 15630)
    • AKOS030228210
    • AKOS032950035
    • AS-69754
    • FP166608
    • NS00081474
    • H11575
    • Q21099040
    • Sodium 2-((2-hydroxynaphthalen-1-yl)diazenyl)naphthalene-1-sulfonate
    • 1248-18-6

  • Applications

    C.I. Pigment Red 49 (CAS 1248-18-6) is commonly used as a red colorant in coatings and paints, in printing inks, and in polymer formulations to impart durable red hues. It is also employed for textile coloration and can be incorporated into adhesives and sealants where an aesthetic red pigment is required. In industrial manufacturing, the pigment provides color stability and lightfastness in formulated systems, with usage governed by local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1.07
    methanol 1.22
    isopropanol 0.58
    water 0.0
    ethyl acetate 2.17
    n-propanol 1.04
    acetone 7.8
    n-butanol 0.71
    acetonitrile 1.92
    DMF 29.12
    toluene 1.28
    isobutanol 0.51
    1,4-dioxane 8.28
    methyl acetate 3.45
    THF 36.63
    2-butanone 7.53
    n-pentanol 0.62
    sec-butanol 0.68
    n-hexane 0.02
    ethylene glycol 0.54
    NMP 17.22
    cyclohexane 0.04
    DMSO 18.71
    n-butyl acetate 3.0
    n-octanol 0.55
    chloroform 3.69
    n-propyl acetate 2.11
    acetic acid 2.62
    dichloromethane 4.69
    cyclohexanone 9.24
    propylene glycol 0.68
    isopropyl acetate 2.0
    DMAc 25.94
    2-ethoxyethanol 3.1
    isopentanol 0.57
    n-heptane 0.05
    ethyl formate 1.84
    1,2-dichloroethane 3.78
    n-hexanol 0.75
    2-methoxyethanol 7.7
    isobutyl acetate 1.35
    tetrachloromethane 0.17
    n-pentyl acetate 2.72
    transcutol 12.45
    n-heptanol 0.74
    ethylbenzene 0.52
    MIBK 2.24
    2-propoxyethanol 6.45
    tert-butanol 0.73
    MTBE 0.98
    2-butoxyethanol 4.03
    propionic acid 1.41
    o-xylene 0.65
    formic acid 1.45
    diethyl ether 1.18
    m-xylene 0.61
    p-xylene 0.73
    chlorobenzene 1.65
    dimethyl carbonate 3.77
    n-octane 0.04
    formamide 4.32
    cyclopentanone 19.87
    2-pentanone 3.83
    anisole 2.25
    cyclopentyl methyl ether 2.9
    gamma-butyrolactone 16.51
    1-methoxy-2-propanol 4.69
    pyridine 11.52
    3-pentanone 3.1
    furfural 14.04
    n-dodecane 0.06
    diethylene glycol 4.97
    diisopropyl ether 0.32
    tert-amyl alcohol 0.67
    acetylacetone 8.63
    n-hexadecane 0.07
    acetophenone 3.49
    methyl propionate 3.11
    isopentyl acetate 2.87
    trichloroethylene 11.21
    n-nonanol 0.73
    cyclohexanol 0.74
    benzyl alcohol 1.82
    2-ethylhexanol 0.61
    isooctanol 0.66
    dipropyl ether 1.52
    1,2-dichlorobenzene 1.58
    ethyl lactate 1.8
    propylene carbonate 4.74
    n-methylformamide 6.27
    2-pentanol 0.42
    n-pentane 0.02
    1-propoxy-2-propanol 4.45
    1-methoxy-2-propyl acetate 7.02
    2-(2-methoxypropoxy) propanol 4.96
    mesitylene 0.35
    ε-caprolactone 5.83
    p-cymene 0.61
    epichlorohydrin 22.42
    1,1,1-trichloroethane 1.55
    2-aminoethanol 1.01
    morpholine-4-carbaldehyde 17.42
    sulfolane 23.28
    2,2,4-trimethylpentane 0.02
    2-methyltetrahydrofuran 5.29
    n-hexyl acetate 2.15
    isooctane 0.02
    2-(2-butoxyethoxy)ethanol 6.55
    sec-butyl acetate 1.46
    tert-butyl acetate 2.8
    decalin 0.04
    glycerin 2.06
    diglyme 12.65
    acrylic acid 2.16
    isopropyl myristate 1.6
    n-butyric acid 1.82
    acetyl acetate 2.18
    di(2-ethylhexyl) phthalate 1.92
    ethyl propionate 1.88
    nitromethane 11.71
    1,2-diethoxyethane 5.19
    benzonitrile 3.11
    trioctyl phosphate 1.15
    1-bromopropane 1.02
    gamma-valerolactone 26.13
    n-decanol 0.64
    triethyl phosphate 1.64
    4-methyl-2-pentanol 0.32
    propionitrile 1.99
    vinylene carbonate 4.88
    1,1,2-trichlorotrifluoroethane 11.25
    DMS 4.28
    cumene 0.36
    2-octanol 0.51
    2-hexanone 3.11
    octyl acetate 1.75
    limonene 0.7
    1,2-dimethoxyethane 8.75
    ethyl orthosilicate 1.47
    tributyl phosphate 1.49
    diacetone alcohol 4.32
    N,N-dimethylaniline 1.5
    acrylonitrile 4.65
    aniline 1.9
    1,3-propanediol 1.66
    bromobenzene 1.62
    dibromomethane 1.87
    1,1,2,2-tetrachloroethane 6.71
    2-methyl-cyclohexyl acetate 2.5
    tetrabutyl urea 3.24
    diisobutyl methanol 0.62
    2-phenylethanol 2.71
    styrene 0.74
    dioctyl adipate 2.81
    dimethyl sulfate 6.4
    ethyl butyrate 2.37
    methyl lactate 3.23
    butyl lactate 2.77
    diethyl carbonate 1.76
    propanediol butyl ether 2.52
    triethyl orthoformate 2.34
    p-tert-butyltoluene 0.59
    methyl 4-tert-butylbenzoate 4.48
    morpholine 8.76
    tert-butylamine 0.29
    n-dodecanol 0.54
    dimethoxymethane 10.72
    ethylene carbonate 3.16
    cyrene 5.35
    2-ethoxyethyl acetate 5.89
    2-ethylhexyl acetate 2.13
    1,2,4-trichlorobenzene 2.81
    4-methylpyridine 5.64
    dibutyl ether 1.29
    2,6-dimethyl-4-heptanol 0.62
    DEF 4.9
    dimethyl isosorbide 13.39
    tetrachloroethylene 3.22
    eugenol 5.2
    triacetin 4.12
    span 80 3.72
    1,4-butanediol 0.48
    1,1-dichloroethane 1.7
    2-methyl-1-pentanol 0.59
    methyl formate 5.56
    2-methyl-1-butanol 0.57
    n-decane 0.08
    butyronitrile 1.5
    3,7-dimethyl-1-octanol 0.7
    1-chlorooctane 0.43
    1-chlorotetradecane 0.27
    n-nonane 0.06
    undecane 0.07
    tert-butylcyclohexane 0.03
    cyclooctane 0.02
    cyclopentanol 1.49
    tetrahydropyran 4.02
    tert-amyl methyl ether 0.94
    2,5,8-trioxanonane 10.64
    1-hexene 0.17
    2-isopropoxyethanol 1.95
    2,2,2-trifluoroethanol 1.03
    methyl butyrate 2.56

    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