Methyl Bromide

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  • Identifiers

    CAS number
    74-83-9

    Molecular formula
    CH3Br

    SMILES
    CBr

    Safety labels

    Compressed Gas
    Compressed Gas

    Acute Toxic
    Acute Toxic

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Ethereal 50.92%
    Alcoholic 48.28%
    Solvent 40.84%
    Fermented 39.11%
    Gassy 36.66%
    Fishy 34.73%
    Sweet 34.26%
    Musty 30.87%
    Pungent 30.59%
    Ripe 29.06%

     

    Flavor
    Sulfur 36.85%
    Garlic 36.27%
    Egg 36.13%
    Fishy 35.73%
    Gasoline 31.23%
    Rotten 28.32%
    Decomposing cabbage 27.41%
    Sulfurous 26.3%
    Onion 24.14%
    Fruity 22.36%

     

    Odor impact est.
    Medium

    Odor threshold

    • Odor Threshold Low: 20.0 [ppm]. Odor Threshold High: 1000.0 [ppm]. Odor thresholds from CHEMINFO
    • In mg/cu m: odor low 80; odor high 4,000
    • Low threshold= 80 mg/cu m, High threshold= 4000 mg/cu m

  • Properties

    XLogP3-AA
    1.0

    pKa est.
    6.89 (neutral)

    Molecular weight
    94.94 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Melting point expt.

    • -136 °F (EPA, 1998)
    • -93.7 °C
    • -94 °C
    • -137 °F

    Boiling point

    • 38.4 °F at 760 mmHg (EPA, 1998)
    • 3.4 °C
    • 3.50 °C. @ 760.00 mm Hg
    • 4 °C
    • 38 °F

    Flash point

    • -18.14 ˚C est.
    • None (EPA, 1998)
    • 194 °C /Open cup vs closed cup not specified/
    • 194 °C
    • NA (Gas)

    Solubility expt.

    • 2 % (NIOSH, 2024)
    • In water, 15,200 mg/L at 25 °C
    • In water, 18.5 g/L at 20 °C
    • In water, 13.4 g/L at 25 °C
    • Slightly soluble in water
    • For more Solubility (Complete) data for Methyl bromide (7 total), please visit the HSDB record page.
    • 15.2 mg/mL at 25 °C
    • Solubility in water, g/100ml at 20 °C: 1.5
    • 2%

  • Synonyms

    • Bromomethane
    • METHYL BROMIDE
    • 74-83-9
    • Terabol
    • Monobromomethane
    • Methane, bromo-
    • methylbromide
    • Curafume
    • Embafume
    • Iscobrome
    • Kayafume
    • Metafume
    • Methogas
    • Methylbromid
    • Pestmaster
    • Celfume
    • CH3Br
    • Haltox
    • Zytox
    • Bromometano
    • Broommethaan
    • Bercema
    • Brom-O-Gas
    • Brom-O-Sol
    • Detia gas EX-M
    • Meth-O-Gas
    • Dowfume MC-2
    • Edco
    • Mebr
    • Metylu bromek
    • Brom-methan
    • Methyl fume
    • Halon 1001
    • Dowfume MC-33
    • Dawson 100
    • Tri-Brom
    • Terr-O-gas 67
    • Bromuro di metile
    • Bromure de methyle
    • Terr-O-gas 100
    • Terr-O-Gas
    • M-B-C Fumigant
    • MBC Soil Fumigant
    • Profume (Obs.)
    • Dowfume MC-2R
    • Terr-O-Cide II
    • Pestmaster (Obs.)
    • Bromur di metile
    • Drexel Plant Bed Gas
    • Fumigant-1 (Obs.)
    • Dowfume MC-2 soil fumigant
    • Brom-O-gaz
    • Dowfume MC-2 Fumigant
    • Mbc-33 Soil Fumigant
    • Rcra waste number U029
    • Monobrommethan
    • Superior Methyl Bromide-2
    • Brommethan
    • bromo-methane
    • Broommethaan [Dutch]
    • Pestmaster Soil Fumigant-1
    • Methyl bromide [BSI:ISO]
    • Bromometano [Italian]
    • Caswell No. 555
    • Methylbromid [German]
    • Brom-methan [German]
    • Metylu bromek [Polish]
    • Fumigant-1
    • R 40B1
    • MeB r
    • Bromur di metile [Italian]
    • Bromure de methyle [French]
    • Bromuro di metile [Italian]
    • CCRIS 385
    • monobrommethane
    • RFDFIF@
    • HSDB 779
    • Methyl bromide as a structural fumigant
    • UN 1062
    • Brom-O-Gas Methyl Bromide Soil Fumigant
    • Bromure de methyle [ISO-French]
    • M-B-R 98
    • Merth-O-gas
    • EINECS 200-813-2
    • F 40B1
    • EPA Pesticide Chemical Code 053201
    • Dow Fume MC2
    • Methyl Bromide Rodent Fumigant (with chloropicrin)
    • CHEBI:39275
    • AI3-01916
    • 9V42E1Z7B6
    • METHYL BROMIDE [MI]
    • METHYL BROMIDE [ISO]
    • METHYL BROMIDE [HSDB]
    • METHYL BROMIDE [IARC]
    • METHYLBROMIDE [WHO-DD]
    • MBX
    • DTXSID8020832
    • EC 200-813-2
    • Methyl bromide, BSI, ISO, JMAF
    • BROOMMETHAAN (DUTCH)
    • Bromuro di metile (Italian)
    • BROM-METHAN (GERMAN)
    • BROMOMETANO (ITALIAN)
    • METHYLBROMID (GERMAN)
    • BMM
    • METHYL BROMIDE (IARC)
    • METYLU BROMEK (POLISH)
    • Bromure de methyle (ISO-French)
    • Dowfume
    • BROMUR DI METILE (ITALIAN)
    • BROMURE DE METHYLE (FRENCH)
    • UN1062
    • RCRA waste no. U029
    • bromanylmethane
    • Methybrom
    • methyl bromide, 14C-labeled
    • carbon-bromine
    • UNII-9V42E1Z7B6
    • MFCD00000166
    • Caswell No 555
    • Methyl bromide [UN1062] [Poison gas]
    • Bromomethane, >=99%
    • CHEMBL48339
    • DTXCID00832
    • Methyl bromide (ACGIH:OSHA)
    • DTXSID50167859
    • STL282739

  • Applications

    Methyl bromide (CAS 74-83-9) is primarily used as a fumigant to control pests in soil, storage facilities, and quarantine contexts, including pre-plant soil treatment to suppress nematodes and soil-borne pests and post-harvest treatment of agricultural commodities during storage and shipment. It is also used for the fumigation of wood and wood packaging materials, such as pallets and crates, to disinfest products prior to export. In addition, it functions as a methylating agent and chemical intermediate in certain industrial syntheses, where it introduces methyl groups into organic substrates such as phenols, amines, or thiols. Some industrial applications involve facility and equipment fumigation for sterilization purposes. Use is subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 62.04
    methanol 56.59
    isopropanol 53.18
    water 2.14
    ethyl acetate 82.1
    n-propanol 58.25
    acetone 137.15
    n-butanol 62.83
    acetonitrile 94.69
    DMF 127.72
    toluene 99.33
    isobutanol 49.64
    1,4-dioxane 189.09
    methyl acetate 83.65
    THF 247.09
    2-butanone 102.71
    n-pentanol 48.03
    sec-butanol 54.76
    n-hexane 33.79
    ethylene glycol 27.37
    NMP 236.32
    cyclohexane 92.3
    DMSO 173.57
    n-butyl acetate 109.64
    n-octanol 54.01
    chloroform 323.5
    n-propyl acetate 70.99
    acetic acid 133.87
    dichloromethane 248.47
    cyclohexanone 216.69
    propylene glycol 25.26
    isopropyl acetate 55.77
    DMAc 117.9
    2-ethoxyethanol 65.45
    isopentanol 53.73
    n-heptane 63.73
    ethyl formate 59.95
    1,2-dichloroethane 151.41
    n-hexanol 71.77
    2-methoxyethanol 91.13
    isobutyl acetate 53.76
    tetrachloromethane 121.49
    n-pentyl acetate 78.54
    transcutol 198.7
    n-heptanol 52.89
    ethylbenzene 49.89
    MIBK 56.74
    2-propoxyethanol 94.25
    tert-butanol 70.1
    MTBE 67.07
    2-butoxyethanol 71.26
    propionic acid 79.94
    o-xylene 72.15
    formic acid 44.78
    diethyl ether 87.84
    m-xylene 63.49
    p-xylene 71.09
    chlorobenzene 137.48
    dimethyl carbonate 39.22
    n-octane 25.35
    formamide 57.06
    cyclopentanone 242.98
    2-pentanone 91.17
    anisole 85.33
    cyclopentyl methyl ether 136.51
    gamma-butyrolactone 214.32
    1-methoxy-2-propanol 69.34
    pyridine 207.6
    3-pentanone 87.08
    furfural 212.25
    n-dodecane 18.01
    diethylene glycol 77.23
    diisopropyl ether 41.67
    tert-amyl alcohol 62.15
    acetylacetone 101.56
    n-hexadecane 20.17
    acetophenone 91.82
    methyl propionate 70.74
    isopentyl acetate 90.13
    trichloroethylene 284.95
    n-nonanol 50.38
    cyclohexanol 108.89
    benzyl alcohol 69.41
    2-ethylhexanol 68.32
    isooctanol 48.05
    dipropyl ether 104.29
    1,2-dichlorobenzene 123.27
    ethyl lactate 38.2
    propylene carbonate 125.2
    n-methylformamide 66.07
    2-pentanol 50.64
    n-pentane 37.28
    1-propoxy-2-propanol 94.25
    1-methoxy-2-propyl acetate 84.52
    2-(2-methoxypropoxy) propanol 73.57
    mesitylene 49.32
    ε-caprolactone 162.28
    p-cymene 64.93
    epichlorohydrin 177.03
    1,1,1-trichloroethane 193.96
    2-aminoethanol 38.22
    morpholine-4-carbaldehyde 181.33
    sulfolane 264.16
    2,2,4-trimethylpentane 22.4
    2-methyltetrahydrofuran 193.19
    n-hexyl acetate 84.57
    isooctane 16.08
    2-(2-butoxyethoxy)ethanol 92.49
    sec-butyl acetate 50.76
    tert-butyl acetate 67.09
    decalin 36.23
    glycerin 41.86
    diglyme 162.62
    acrylic acid 87.7
    isopropyl myristate 48.82
    n-butyric acid 95.96
    acetyl acetate 69.69
    di(2-ethylhexyl) phthalate 48.74
    ethyl propionate 60.04
    nitromethane 142.91
    1,2-diethoxyethane 106.55
    benzonitrile 114.36
    trioctyl phosphate 38.44
    1-bromopropane 111.14
    gamma-valerolactone 215.95
    n-decanol 42.21
    triethyl phosphate 53.24
    4-methyl-2-pentanol 35.18
    propionitrile 78.98
    vinylene carbonate 120.31
    1,1,2-trichlorotrifluoroethane 151.53
    DMS 66.63
    cumene 41.67
    2-octanol 44.07
    2-hexanone 73.85
    octyl acetate 57.01
    limonene 94.49
    1,2-dimethoxyethane 110.48
    ethyl orthosilicate 53.92
    tributyl phosphate 43.16
    diacetone alcohol 70.89
    N,N-dimethylaniline 70.53
    acrylonitrile 92.67
    aniline 101.34
    1,3-propanediol 54.14
    bromobenzene 144.68
    dibromomethane 205.51
    1,1,2,2-tetrachloroethane 225.0
    2-methyl-cyclohexyl acetate 76.02
    tetrabutyl urea 60.66
    diisobutyl methanol 56.71
    2-phenylethanol 77.76
    styrene 70.25
    dioctyl adipate 64.9
    dimethyl sulfate 68.55
    ethyl butyrate 89.53
    methyl lactate 41.95
    butyl lactate 56.79
    diethyl carbonate 61.8
    propanediol butyl ether 62.66
    triethyl orthoformate 72.09
    p-tert-butyltoluene 62.16
    methyl 4-tert-butylbenzoate 85.88
    morpholine 169.98
    tert-butylamine 56.44
    n-dodecanol 37.44
    dimethoxymethane 80.51
    ethylene carbonate 98.03
    cyrene 88.86
    2-ethoxyethyl acetate 82.27
    2-ethylhexyl acetate 86.13
    1,2,4-trichlorobenzene 149.8
    4-methylpyridine 167.44
    dibutyl ether 75.03
    2,6-dimethyl-4-heptanol 56.71
    DEF 100.33
    dimethyl isosorbide 133.35
    tetrachloroethylene 198.58
    eugenol 80.97
    triacetin 82.94
    span 80 82.54
    1,4-butanediol 29.21
    1,1-dichloroethane 141.48
    2-methyl-1-pentanol 47.05
    methyl formate 58.39
    2-methyl-1-butanol 53.22
    n-decane 26.46
    butyronitrile 84.78
    3,7-dimethyl-1-octanol 52.5
    1-chlorooctane 58.42
    1-chlorotetradecane 32.15
    n-nonane 28.11
    undecane 21.09
    tert-butylcyclohexane 29.2
    cyclooctane 38.87
    cyclopentanol 114.21
    tetrahydropyran 190.17
    tert-amyl methyl ether 65.91
    2,5,8-trioxanonane 130.79
    1-hexene 57.87
    2-isopropoxyethanol 55.4
    2,2,2-trifluoroethanol 67.42
    methyl butyrate 74.97

    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