2-Mercaptobenzothiazole

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  • Identifiers

    CAS number
    149-30-4

    Molecular formula
    C7H5NS2

    SMILES
    C1=CC=C2C(=C1)NC(=S)S2

    Safety labels

    Irritant
    Irritant

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Sulfurous 80.33%
    Burnt 59.6%
    Meaty 51.83%
    Garlic 51.68%
    Roasted 41.6%
    Cooked 36.71%
    Alliaceous 36.01%
    Pungent 34.16%
    Coffee 34.12%
    Savory 33.88%

     

    Flavor
    Bitter 51.44%
    Nutty 44.0%
    Coffee 28.78%
    Roasted 27.83%
    Chocolate 26.95%
    Sulfur 24.8%
    Cocoa 24.49%
    Corn 23.95%
    Bread crust 23.91%
    Popcorn 23.68%

     

    Odor impact est.
    Low

    Odor threshold

    • Odor Threshold Low: 2.0 [mmHg]. Odor threshold from CHEMINFO

  • Properties

    XLogP3-AA
    2.4

    pKa est.
    6.37 (neutral)

    Molecular weight
    167.3 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Melting point expt.

    • 351 to 358 °F (NTP, 1992)
    • 180.2-181.7 °C
    • MP: 170-173 °C /Technical mercaptobenzothiazole/
    • 177 - 179 °C
    • 180-182 °C

    Boiling point

    • Decomposes (NTP, 1992)
    • Not determinable experimentally by EU Method A.2 (Boiling Temperature) due to overlapping endothermic and exothermic reactions.

    Flash point

    • 145.92 ˚C est.
    • 392 °F (NTP, 1992)
    • 392 °F
    • 243 °C

    Solubility expt.

    • less than 1 mg/mL at 66 °F (NTP, 1992)
    • In water at 25 °C, 51 mg/L (pH 5), 118 mg/L (pH 7), 900 mg/L (pH 9)
    • In pure water, 120 mg/L at 24 °C; in buffered creek water at 24 °C, 190 mg/L (pH 6.5), 230 mg/l (pH 7.5), 260 mg/L (pH 8.5)
    • Solubility at 25 °C (g/100 mL) in alcohol: 2.0; ether 1.0; acetone 10.0; benzene 1.0; carbon tetrachloride <0.2; naphtha <0.5. Moderately soluble in glacial acetic acid. Soluble in alkalies and alkali carbonate solutions
    • Soluble in dilute caustic soda, alcohol, acetone, benzene, chloroform; insoluble in water and gasoline.
    • For more Solubility (Complete) data for 2-MERCAPTOBENZOTHIAZOLE (6 total), please visit the HSDB record page.
    • 0.12 mg/mL at 24 °C
    • Solubility in water, g/100ml at 20 °C: 0.01 (very poor)

  • Synonyms

    • 2-Mercaptobenzothiazole
    • 149-30-4
    • 2-Benzothiazolethiol
    • Benzo[d]thiazole-2-thiol
    • Benzo[d]thiazole-2(3H)-thione
    • Benzothiazolethiol
    • Captax
    • 1,3-Benzothiazole-2-thiol
    • 118090-09-8
    • MERCAPTOBENZOTHIAZOLE
    • 2(3H)-Benzothiazolethione
    • Benzothiazole-2-thiol
    • Sulfadene
    • 2-MBT
    • Dermacid
    • Thiotax
    • Kaptax
    • Mertax
    • Rokon
    • Rotax
    • Accelerator M
    • Vulkacit M
    • Ekagom G
    • Accel M
    • Mebetizole
    • Mebithizol
    • Kaptaks
    • Nuodeb 84
    • Soxinol M
    • Vulkacit Mercapto
    • Pneumax MBT
    • 2-Mercaptobenzthiazole
    • Royal MBT
    • Mercaptobenzothiazol
    • Mercaptobenzthiazole
    • Vulkacit Mercapto/C
    • 2-Mercptobenzothiazole
    • Pennac mbt powder
    • mebetizol
    • Benzothiazole-2-thione
    • 2-Benzothiazolinethione
    • Nuodex 84
    • Usaf gy-3
    • Nocceler M
    • Usaf xr-29
    • MBT
    • Benzothiazole, mercapto-
    • 2-Benzothiazolyl mercaptan
    • 2-Merkaptobenzotiazol
    • 2-Merkaptobenzthiazol
    • 1,3-Benzothiazol-2-yl hydrosulfide
    • 2-Benzothiazolethiol(9CI)
    • benzothiazolyl mercaptan
    • 3H-1,3-benzothiazole-2-thione
    • AG 63
    • Caswell No. 541
    • 2-sulfanyl-1,3-benzothiazole
    • Perkacit MBT
    • CHEBI:34292
    • NCI-C56519
    • Mercaptobenzothiazole (VAN)
    • CCRIS 891
    • DTXSID1020807
    • HSDB 4025
    • NSC 2041
    • EINECS 205-736-8
    • UNII-5RLR54Z22K
    • Accelerator mercapto
    • EPA Pesticide Chemical Code 051701
    • 5RLR54Z22K
    • AI3-00985
    • 2-Mercaptobenzothioazole
    • 2-mercapto-benzothiazole
    • NSC-2041
    • MFCD00005781
    • 1,3-Benzothiazole-2-thione
    • DTXCID90807
    • 2-Sulphanyl-1,3-benzothiazole
    • NSC2041
    • EC 205-736-8
    • 1,3-benzothiazole-2(3H)-thione
    • 1,3-Benzothiazol-2-yl hydrosulphide
    • NCGC00091643-07
    • NCGC00091643-08
    • Kaptax [Czech]
    • 2-thiobenzothiazole
    • 2(3H)-Benzothiazolethione, potassium salt
    • C7H5NS2
    • pennac mbt
    • Thiot ax
    • Sanceler M
    • Wobezit M
    • 2-MERCAPTOBENZOTHIAZOLE (IARC)
    • 2-MERCAPTOBENZOTHIAZOLE [IARC]
    • Nonflex NB
    • captax, zinc salt
    • CAS-149-30-4
    • captax, sodium salt
    • 2-Merkaptobenzthiazol [Czech]
    • 2-Merkaptobenzotiazol [Polish]
    • Vulkacit Mercapto/MG
    • Aero Promoter 412
    • captax, potassium salt
    • 2-Sulfanylbenzothiazole
    • 2-Mercapto benzothiazole
    • Vulkafil ZN 94TT01
    • captax, lead(+2) salt
    • captax, cobalt(+2) salt
    • captax, copper(+2) salt
    • captax, silver(+1) salt
    • captax, bismuth(+3) salt
    • captax, mercury (+2) salt
    • Drmacid
    • thione tautomer
    • MBT (vulcanization accelerator)
    • Skin Balm
    • MBT, captax
    • 2-benzothiazolthiol
    • 2-mercaptobenzthiazol
    • mercapto-benzothiazole
    • 2-Benzothiazolethione
    • 2-mercaptobenzothiazol
    • 2-mercapto-benzthiazole
    • Spectrum_001669
    • SpecPlus_000728
    • 155-04-4
    • Spectrum2_001666
    • Spectrum3_001665

  • Applications

    2-Mercaptobenzothiazole (CAS 149-30-4) is widely used as a vulcanization accelerator for natural and synthetic rubber, accelerating cure and enhancing mechanical properties in tires and other rubber products. It also serves as a processing aid and stabilizer in polymer and plastic formulations, improving oxidative stability and processability. In metal-containing systems, MBT acts as a corrosion inhibitor in cooling waters, metalworking fluids, and coatings, protecting steel and copper surfaces from corrosion. It is an intermediate in the synthesis of other benzothiazole derivatives used in specialty chemicals. MBT is also considered a component in rubber and adhesive formulations as part of cure systems, depending on formulation and local regulatory limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 36.37
    methanol 35.73
    isopropanol 30.88
    water 0.09
    ethyl acetate 43.19
    n-propanol 37.66
    acetone 99.33
    n-butanol 38.83
    acetonitrile 16.58
    DMF 210.52
    toluene 3.24
    isobutanol 27.31
    1,4-dioxane 77.26
    methyl acetate 68.43
    THF 208.84
    2-butanone 112.23
    n-pentanol 37.38
    sec-butanol 37.19
    n-hexane 0.54
    ethylene glycol 18.09
    NMP 111.12
    cyclohexane 0.29
    DMSO 117.93
    n-butyl acetate 35.2
    n-octanol 22.84
    chloroform 13.06
    n-propyl acetate 45.84
    acetic acid 29.04
    dichloromethane 11.95
    cyclohexanone 64.95
    propylene glycol 27.36
    isopropyl acetate 28.47
    DMAc 172.18
    2-ethoxyethanol 101.42
    isopentanol 32.3
    n-heptane 1.34
    ethyl formate 31.7
    1,2-dichloroethane 12.3
    n-hexanol 31.83
    2-methoxyethanol 129.0
    isobutyl acetate 31.43
    tetrachloromethane 1.61
    n-pentyl acetate 35.69
    transcutol 171.92
    n-heptanol 25.38
    ethylbenzene 4.65
    MIBK 36.42
    2-propoxyethanol 90.02
    tert-butanol 31.84
    MTBE 31.7
    2-butoxyethanol 61.79
    propionic acid 31.69
    o-xylene 3.43
    formic acid 13.03
    diethyl ether 24.62
    m-xylene 3.52
    p-xylene 6.67
    chlorobenzene 8.64
    dimethyl carbonate 36.22
    n-octane 0.96
    formamide 30.98
    cyclopentanone 128.48
    2-pentanone 62.88
    anisole 40.88
    cyclopentyl methyl ether 42.1
    gamma-butyrolactone 111.52
    1-methoxy-2-propanol 103.52
    pyridine 40.17
    3-pentanone 45.11
    furfural 80.71
    n-dodecane 1.46
    diethylene glycol 75.33
    diisopropyl ether 7.56
    tert-amyl alcohol 36.66
    acetylacetone 64.72
    n-hexadecane 1.6
    acetophenone 41.74
    methyl propionate 56.3
    isopentyl acetate 31.43
    trichloroethylene 27.9
    n-nonanol 23.07
    cyclohexanol 22.2
    benzyl alcohol 37.1
    2-ethylhexanol 20.72
    isooctanol 22.27
    dipropyl ether 20.03
    1,2-dichlorobenzene 9.83
    ethyl lactate 36.8
    propylene carbonate 48.1
    n-methylformamide 63.34
    2-pentanol 26.86
    n-pentane 0.48
    1-propoxy-2-propanol 63.33
    1-methoxy-2-propyl acetate 52.23
    2-(2-methoxypropoxy) propanol 64.92
    mesitylene 2.44
    ε-caprolactone 61.36
    p-cymene 6.18
    epichlorohydrin 95.29
    1,1,1-trichloroethane 9.42
    2-aminoethanol 31.18
    morpholine-4-carbaldehyde 136.03
    sulfolane 100.88
    2,2,4-trimethylpentane 0.9
    2-methyltetrahydrofuran 80.58
    n-hexyl acetate 40.62
    isooctane 0.7
    2-(2-butoxyethoxy)ethanol 86.68
    sec-butyl acetate 30.68
    tert-butyl acetate 31.85
    decalin 0.84
    glycerin 43.61
    diglyme 122.53
    acrylic acid 28.31
    isopropyl myristate 21.77
    n-butyric acid 37.0
    acetyl acetate 19.08
    di(2-ethylhexyl) phthalate 23.59
    ethyl propionate 39.88
    nitromethane 67.51
    1,2-diethoxyethane 58.8
    benzonitrile 24.72
    trioctyl phosphate 18.43
    1-bromopropane 7.02
    gamma-valerolactone 142.78
    n-decanol 19.57
    triethyl phosphate 18.18
    4-methyl-2-pentanol 18.58
    propionitrile 21.49
    vinylene carbonate 36.93
    1,1,2-trichlorotrifluoroethane 56.85
    DMS 36.59
    cumene 4.88
    2-octanol 20.83
    2-hexanone 57.21
    octyl acetate 28.35
    limonene 8.54
    1,2-dimethoxyethane 130.76
    ethyl orthosilicate 17.5
    tributyl phosphate 19.61
    diacetone alcohol 58.98
    N,N-dimethylaniline 26.24
    acrylonitrile 28.06
    aniline 18.37
    1,3-propanediol 48.23
    bromobenzene 5.68
    dibromomethane 5.88
    1,1,2,2-tetrachloroethane 23.73
    2-methyl-cyclohexyl acetate 27.43
    tetrabutyl urea 29.98
    diisobutyl methanol 13.15
    2-phenylethanol 35.08
    styrene 6.02
    dioctyl adipate 31.07
    dimethyl sulfate 51.55
    ethyl butyrate 30.51
    methyl lactate 46.38
    butyl lactate 38.74
    diethyl carbonate 20.6
    propanediol butyl ether 61.62
    triethyl orthoformate 25.54
    p-tert-butyltoluene 6.22
    methyl 4-tert-butylbenzoate 37.23
    morpholine 99.3
    tert-butylamine 14.07
    n-dodecanol 16.01
    dimethoxymethane 116.22
    ethylene carbonate 30.22
    cyrene 68.9
    2-ethoxyethyl acetate 57.9
    2-ethylhexyl acetate 25.33
    1,2,4-trichlorobenzene 15.19
    4-methylpyridine 35.73
    dibutyl ether 22.28
    2,6-dimethyl-4-heptanol 13.15
    DEF 65.95
    dimethyl isosorbide 85.59
    tetrachloroethylene 12.25
    eugenol 54.25
    triacetin 46.02
    span 80 50.71
    1,4-butanediol 30.98
    1,1-dichloroethane 11.48
    2-methyl-1-pentanol 31.76
    methyl formate 51.75
    2-methyl-1-butanol 33.08
    n-decane 1.86
    butyronitrile 24.03
    3,7-dimethyl-1-octanol 21.01
    1-chlorooctane 8.84
    1-chlorotetradecane 4.95
    n-nonane 1.43
    undecane 1.65
    tert-butylcyclohexane 1.17
    cyclooctane 0.2
    cyclopentanol 36.96
    tetrahydropyran 49.09
    tert-amyl methyl ether 31.15
    2,5,8-trioxanonane 97.85
    1-hexene 4.51
    2-isopropoxyethanol 72.84
    2,2,2-trifluoroethanol 15.48
    methyl butyrate 52.24

    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