Ethanethiol

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  • Identifiers

    CAS number
    75-08-1

    Molecular formula
    C2H6S

    SMILES
    CCS

    Safety labels

    Flammable
    Flammable

    Acute Toxic
    Acute Toxic

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Sulfurous 91.78%
    Meaty 83.18%
    Onion 72.31%
    Garlic 68.12%
    Vegetable 57.37%
    Savory 56.82%
    Alliaceous 56.44%
    Fruity 50.22%
    Tropical 46.85%
    Roasted 45.69%

     

    Flavor
    Fruity 68.83%
    Sulfurous 66.02%
    Onion 55.72%
    Garlic 50.57%
    Meaty 45.91%
    Sulfur 43.67%
    Cabbage 41.86%
    Sulfury 39.65%
    Fishy 36.35%
    Vegetable 35.74%

     

    Odor impact est.
    High

    Odor threshold

    • Odor Threshold Low: 0.000098 [mmHg]. Odor Threshold High: 0.003 [mmHg]. Detection odor threshold from AIHA (mean = 0.00035 ppm)
    • An odor threshold of 0.00076 ppm has been reported.
    • Minimum detectable concentration= 1 part in 50 billion parts of air.
    • 0.0003 PPM
    • The human odor recognition in air appears at a concentration of 0.1 to1.0 ppb; the odor detection in air ranges from 2.1-6.6x10-10 to 4.6x10-4 mg/cu m and from 1.9x10-4 mg/L to 43.5 ppm in water. ...

  • Properties

    XLogP3-AA
    0.9

    pKa est.
    9.52 (weak base)

    Molecular weight
    62.14 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Melting point expt.

    • -234 °F (USCG, 1999)
    • -147.8 °C
    • -144.4 °C
    • -234 °F
    • -228 °F

    Boiling point

    • 93.9 °F at 760 mmHg (USCG, 1999)
    • 35.1 °C
    • Azeotrope with n-pentane (51% ethanethiol) bp: 30.46 °C; with ether (40% ethanethiol) bp: 31.50 °C
    • 35 °C
    • 93.9 °F
    • 95 °F

    Flash point

    • -29.83 ˚C est.
    • less than 0 °F (USCG, 1999)
    • -48.3 C
    • -48.3 °C (Closed cup)
    • -54 °C (Closed cup)
    • -48.3 °C
    • -55 °F

    Solubility expt.

    • 0.7 % (NIOSH, 2024)
    • Soluble in alcohol, ether, petroleum naphtha
    • Soluble in acetone, dilute alkali
    • In water, 15,603 mg/L at 25 °C
    • Solubility in water, g/100ml at 20 °C: 0.68
    • Slightly soluble in water
    • Soluble (in ethanol)
    • 0.7%

  • Synonyms

    • Ethanethiol
    • ETHYL MERCAPTAN
    • 75-08-1
    • Mercaptoethane
    • Ethyl sulfhydrate
    • Thioethanol
    • Ethyl thioalcohol
    • Thioethyl alcohol
    • Ethyl hydrosulfide
    • Aethylmercaptan
    • Etilmercaptano
    • Aethanethiol
    • Etantiolo
    • 1-Mercaptoethane
    • Ethaanthiol
    • Ethylmercaptaan
    • Ethylmerkaptan
    • ethyl-mercaptan
    • Mercaptan C2
    • LPG ethyl mercaptan 1010
    • NSC 93877
    • stench
    • HSDB 814
    • stench gas
    • 1-ethanethiol
    • EINECS 200-837-3
    • UNII-M439R54A1D
    • AI3-26618
    • M439R54A1D
    • NSC-93877
    • DTXSID9026394
    • FEMA NO. 4258
    • CHEBI:46511
    • EC 200-837-3
    • ETHANETHIOL (MART.)
    • ETHANETHIOL [MART.]
    • Etantiolo [Italian]
    • Ethaanthiol [Dutch]
    • Aethanethiol [German]
    • ethanthiol
    • ethylmercaptan
    • Ethylmerkaptan [Czech]
    • Ethylmercaptaan [Dutch]
    • Aethylmercaptan [German]
    • Etilmercaptano [Italian]
    • UN2363
    • ethanethioi
    • ethanothiol
    • ethane thiol
    • 1-Ethylthiol
    • EtSH
    • HSEt
    • Ethanethiol, 97%
    • MFCD00004887
    • Ethanethiol, >=97%
    • ETHANETHIOL [MI]
    • ETHANETHIOL [FHFI]
    • C2H5SH
    • WLN: SH2
    • ETHYL MERCAPTAN [HSDB]
    • DTXCID506394
    • Ethanethiol, analytical standard
    • NSC93877
    • AKOS000120313
    • UN 2363
    • MSK158171-1000M
    • DB-004032
    • E0036
    • NS00005388
    • EN300-20602
    • Ethanethiol Solution in Methanol, 1000ug/mL
    • InChI=1/C2H6S/c1-2-3/h3H,2H2,1H
    • Ethyl mercaptan [UN2363] [Flammable liquid]
    • Ethanethiol (ethyl mercaptan), analytical standard
    • Q407918
    • F0001-1889
    • QuadraPure(R) DET, 450-650 mum, extent of labeling: 1.0-2.0 mmol/g loading, macroporous
    • 200-837-3
    • EUF

  • Applications

    Ethanethiol (ethyl mercaptan, CAS 75-08-1) is a volatile liquid with an extremely strong odor that is used mainly as an odorant for natural gas and LPG to enable leak detection, and also serves as a precursor in organic synthesis for producing sulfur-containing compounds, pesticides, pharmaceuticals, and rubber additives; it is additionally employed as a calibration standard in chromatographic analysis, a trace flavoring agent, a controlled-ignition modifier in fuels, and a chain-transfer or surface-modifying agent in polymer and metal treatments, although strict safety procedures are essential because of its toxicity and flammability.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 403.42
    methanol 396.52
    isopropanol 280.52
    water 1.74
    ethyl acetate 129.98
    n-propanol 299.69
    acetone 333.48
    n-butanol 299.44
    acetonitrile 132.29
    DMF 261.37
    toluene 63.22
    isobutanol 190.97
    1,4-dioxane 266.65
    methyl acetate 124.11
    THF 536.34
    2-butanone 206.82
    n-pentanol 154.1
    sec-butanol 226.12
    n-hexane 59.8
    ethylene glycol 127.91
    NMP 222.9
    cyclohexane 98.38
    DMSO 388.88
    n-butyl acetate 249.11
    n-octanol 121.68
    chloroform 274.41
    n-propyl acetate 109.6
    acetic acid 375.73
    dichloromethane 210.68
    cyclohexanone 282.22
    propylene glycol 160.92
    isopropyl acetate 82.79
    DMAc 154.74
    2-ethoxyethanol 166.36
    isopentanol 175.15
    n-heptane 126.81
    ethyl formate 98.82
    1,2-dichloroethane 142.43
    n-hexanol 321.27
    2-methoxyethanol 312.24
    isobutyl acetate 80.41
    tetrachloromethane 85.94
    n-pentyl acetate 103.83
    transcutol 453.91
    n-heptanol 137.95
    ethylbenzene 31.86
    MIBK 97.68
    2-propoxyethanol 341.23
    tert-butanol 260.99
    MTBE 147.61
    2-butoxyethanol 175.7
    propionic acid 203.06
    o-xylene 42.22
    formic acid 102.52
    diethyl ether 174.03
    m-xylene 43.74
    p-xylene 43.53
    chlorobenzene 87.21
    dimethyl carbonate 45.52
    n-octane 29.27
    formamide 92.11
    cyclopentanone 355.72
    2-pentanone 181.17
    anisole 70.19
    cyclopentyl methyl ether 206.49
    gamma-butyrolactone 264.76
    1-methoxy-2-propanol 233.69
    pyridine 197.19
    3-pentanone 126.33
    furfural 222.53
    n-dodecane 20.29
    diethylene glycol 235.22
    diisopropyl ether 58.72
    tert-amyl alcohol 180.52
    acetylacetone 145.73
    n-hexadecane 21.27
    acetophenone 69.1
    methyl propionate 104.85
    isopentyl acetate 169.19
    trichloroethylene 227.1
    n-nonanol 101.42
    cyclohexanol 224.02
    benzyl alcohol 71.77
    2-ethylhexanol 184.83
    isooctanol 92.24
    dipropyl ether 236.26
    1,2-dichlorobenzene 67.42
    ethyl lactate 60.88
    propylene carbonate 143.38
    n-methylformamide 137.06
    2-pentanol 174.44
    n-pentane 77.07
    1-propoxy-2-propanol 316.96
    1-methoxy-2-propyl acetate 147.72
    2-(2-methoxypropoxy) propanol 139.81
    mesitylene 31.28
    ε-caprolactone 182.3
    p-cymene 56.44
    epichlorohydrin 219.22
    1,1,1-trichloroethane 154.19
    2-aminoethanol 198.17
    morpholine-4-carbaldehyde 226.2
    sulfolane 306.92
    2,2,4-trimethylpentane 25.47
    2-methyltetrahydrofuran 304.59
    n-hexyl acetate 139.35
    isooctane 22.27
    2-(2-butoxyethoxy)ethanol 204.98
    sec-butyl acetate 65.09
    tert-butyl acetate 96.06
    decalin 24.79
    glycerin 185.13
    diglyme 306.73
    acrylic acid 169.18
    isopropyl myristate 65.19
    n-butyric acid 254.62
    acetyl acetate 89.86
    di(2-ethylhexyl) phthalate 62.75
    ethyl propionate 78.43
    nitromethane 224.49
    1,2-diethoxyethane 172.71
    benzonitrile 87.31
    trioctyl phosphate 56.06
    1-bromopropane 141.56
    gamma-valerolactone 302.15
    n-decanol 77.33
    triethyl phosphate 56.21
    4-methyl-2-pentanol 81.32
    propionitrile 122.24
    vinylene carbonate 117.28
    1,1,2-trichlorotrifluoroethane 212.42
    DMS 70.29
    cumene 26.12
    2-octanol 82.39
    2-hexanone 136.89
    octyl acetate 88.48
    limonene 108.1
    1,2-dimethoxyethane 220.31
    ethyl orthosilicate 60.71
    tributyl phosphate 64.52
    diacetone alcohol 145.69
    N,N-dimethylaniline 53.64
    acrylonitrile 123.78
    aniline 100.63
    1,3-propanediol 234.75
    bromobenzene 75.21
    dibromomethane 178.24
    1,1,2,2-tetrachloroethane 192.92
    2-methyl-cyclohexyl acetate 106.58
    tetrabutyl urea 88.35
    diisobutyl methanol 96.24
    2-phenylethanol 117.95
    styrene 44.34
    dioctyl adipate 89.63
    dimethyl sulfate 65.18
    ethyl butyrate 139.39
    methyl lactate 79.03
    butyl lactate 96.17
    diethyl carbonate 74.81
    propanediol butyl ether 169.37
    triethyl orthoformate 101.94
    p-tert-butyltoluene 58.56
    methyl 4-tert-butylbenzoate 88.42
    morpholine 319.11
    tert-butylamine 171.03
    n-dodecanol 64.92
    dimethoxymethane 156.52
    ethylene carbonate 99.84
    cyrene 96.28
    2-ethoxyethyl acetate 108.59
    2-ethylhexyl acetate 140.13
    1,2,4-trichlorobenzene 84.07
    4-methylpyridine 147.17
    dibutyl ether 126.73
    2,6-dimethyl-4-heptanol 96.24
    DEF 140.12
    dimethyl isosorbide 191.31
    tetrachloroethylene 150.78
    eugenol 100.19
    triacetin 105.5
    span 80 180.76
    1,4-butanediol 95.07
    1,1-dichloroethane 160.1
    2-methyl-1-pentanol 104.3
    methyl formate 91.03
    2-methyl-1-butanol 170.3
    n-decane 30.96
    butyronitrile 159.34
    3,7-dimethyl-1-octanol 107.75
    1-chlorooctane 70.01
    1-chlorotetradecane 33.9
    n-nonane 33.97
    undecane 23.88
    tert-butylcyclohexane 26.87
    cyclooctane 32.51
    cyclopentanol 271.94
    tetrahydropyran 336.63
    tert-amyl methyl ether 109.27
    2,5,8-trioxanonane 220.75
    1-hexene 115.98
    2-isopropoxyethanol 120.44
    2,2,2-trifluoroethanol 89.58
    methyl butyrate 108.94

    Scent© AI

1 4

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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