Methyltrichlorosilane

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  • Identifiers

    CAS number
    75-79-6

    Molecular formula
    CH3Cl3Si

    SMILES
    C[Si](Cl)(Cl)Cl

    Safety labels

    Flammable
    Flammable

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 45.42%
    Fishy 30.99%
    Sweet 30.0%
    Floral 29.16%
    Woody 21.99%
    Fresh 18.01%
    Balsamic 17.51%
    Clean 17.27%
    Citrus 16.55%
    Ripe 16.29%

     

    Flavor
    Odorless 31.24%
    Sulfurous 24.62%
    Meaty 21.84%
    Sulfury 21.45%
    Fishy 19.98%
    Glue 18.75%
    Bloody 18.59%
    Rotten 18.16%
    Bouillon 18.07%
    Skunky 17.79%

     

    Odor impact est.
    Medium

  • Properties

    pKa est.
    9.38 (weak base)

    Molecular weight
    149.47 g/mol

    Melting point expt.

    • -108 °F (EPA, 1998)
    • -90 °C

    Boiling point

    • 152 °F at 760 mmHg (EPA, 1998)
    • 65.6 °C
    • 66 °C

    Flash point

    • -2.05 ˚C est.
    • 15 °F (EPA, 1998)
    • 45 °F (Open cup); 15 °F (Closed cup)
    • 8 °C

    Solubility expt.

    • Decomposes in ethanol
    • Decomposes instantly in water
    • Solubility in water: reaction

  • Synonyms

    • METHYLTRICHLOROSILANE
    • 75-79-6
    • Trichloro(methyl)silane
    • Trichloromethylsilane
    • Silane, trichloromethyl-
    • Methyl-trichlorsilan
    • Methylsilyl trichloride
    • Trichloromethylsilicon
    • Monomethyltrichlorosilane
    • Methylsilicochloroform
    • Silane, methyltrichloro-
    • Trichlor-methylsilan
    • NSC 77069
    • CCRIS 1322
    • HSDB 840
    • EINECS 200-902-6
    • trichloromethylsilan
    • UNII-UIR5I18638
    • BRN 1361381
    • CH3SiCl3
    • AI3-51465
    • UIR5I18638
    • MFCD00000481
    • NSC-77069
    • DTXSID4026426
    • EC 200-902-6
    • KA-13
    • LS-40
    • 4-04-00-04212 (Beilstein Handbook Reference)
    • TSL-8003
    • Methyl-trichlorsilan [Czech]
    • Trichlor-methylsilan [Czech]
    • methyl trichlorosilane
    • UN1250
    • MeSiCl3
    • SiCH3Cl3
    • Methyltrichlorosilane, 99%
    • WLN: G-SI-GG1
    • SCHEMBL17738
    • METHYL SILICO CHLOROFORM
    • Methyltrichlorosilane, >=96%
    • DTXCID406426
    • SCHEMBL9391156
    • LS 40
    • METHYLTRICHLOROSILANE [HSDB]
    • NSC77069
    • AKOS008901381
    • UN 1250
    • LS-12928
    • InChI=1/CH3Cl3Si/c1-5(2,3)4/h1H
    • M0450
    • NS00041129
    • Methyltrichlorosilane [UN1250] [Flammable liquid]
    • Q1814764
    • F8881-5551
    • Methyltrichlorosilane, deposition grade, >=98% (GC), >=99.99% (as metals)
    • 200-902-6

  • Applications

    Methyltrichlorosilane, CAS 75-79-6, is a chlorosilane widely used as a key building block in silicone polymer chemistry. It serves as a precursor to methyl-substituted siloxanes, enabling the production of silicone oils, resins, and elastomers via controlled hydrolysis and polycondensation. It is also used as a feedstock to prepare organosilane intermediates for coatings, adhesives, and surface treatments on glass, ceramics, and metals to improve adhesion and impart hydrophobic or moisture-barrier properties. In sol-gel processing, it participates in forming methylated silica networks used in coatings and optics. It is a common intermediary for making organosilane coupling agents for coatings, inks, and adhesives, and is used in electronics-related encapsulation or conformal coating formulations via silicone chemistries.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 205.16
    methanol 276.12
    isopropanol 196.29
    water 32.59
    ethyl acetate 199.17
    n-propanol 180.43
    acetone 419.31
    n-butanol 181.25
    acetonitrile 169.2
    DMF 939.12
    toluene 161.17
    isobutanol 145.53
    1,4-dioxane 404.39
    methyl acetate 210.26
    THF 638.45
    2-butanone 257.35
    n-pentanol 143.76
    sec-butanol 176.21
    n-hexane 62.98
    ethylene glycol 124.28
    NMP 613.73
    cyclohexane 90.68
    DMSO 704.29
    n-butyl acetate 167.73
    n-octanol 152.5
    chloroform 362.28
    n-propyl acetate 155.55
    acetic acid 216.97
    dichloromethane 322.51
    cyclohexanone 353.79
    propylene glycol 138.05
    isopropyl acetate 166.84
    DMAc 681.98
    2-ethoxyethanol 252.88
    isopentanol 151.58
    n-heptane 74.65
    ethyl formate 182.77
    1,2-dichloroethane 245.74
    n-hexanol 161.77
    2-methoxyethanol 430.67
    isobutyl acetate 116.72
    tetrachloromethane 108.97
    n-pentyl acetate 167.89
    transcutol 400.18
    n-heptanol 135.09
    ethylbenzene 94.86
    MIBK 185.88
    2-propoxyethanol 306.94
    tert-butanol 234.45
    MTBE 214.67
    2-butoxyethanol 216.18
    propionic acid 153.45
    o-xylene 139.72
    formic acid 140.93
    diethyl ether 227.3
    m-xylene 133.6
    p-xylene 118.31
    chlorobenzene 169.8
    dimethyl carbonate 203.25
    n-octane 43.3
    formamide 205.92
    cyclopentanone 448.16
    2-pentanone 258.38
    anisole 204.18
    cyclopentyl methyl ether 315.06
    gamma-butyrolactone 399.96
    1-methoxy-2-propanol 376.86
    pyridine 268.23
    3-pentanone 212.41
    furfural 443.61
    n-dodecane 35.41
    diethylene glycol 278.83
    diisopropyl ether 120.79
    tert-amyl alcohol 192.81
    acetylacetone 334.21
    n-hexadecane 38.85
    acetophenone 194.62
    methyl propionate 207.45
    isopentyl acetate 148.55
    trichloroethylene 358.26
    n-nonanol 138.45
    cyclohexanol 197.19
    benzyl alcohol 158.77
    2-ethylhexanol 116.67
    isooctanol 113.35
    dipropyl ether 187.47
    1,2-dichlorobenzene 170.62
    ethyl lactate 126.1
    propylene carbonate 247.8
    n-methylformamide 298.94
    2-pentanol 158.23
    n-pentane 73.72
    1-propoxy-2-propanol 251.87
    1-methoxy-2-propyl acetate 225.34
    2-(2-methoxypropoxy) propanol 198.59
    mesitylene 107.38
    ε-caprolactone 277.94
    p-cymene 89.37
    epichlorohydrin 368.81
    1,1,1-trichloroethane 236.17
    2-aminoethanol 153.24
    morpholine-4-carbaldehyde 614.27
    sulfolane 534.48
    2,2,4-trimethylpentane 44.13
    2-methyltetrahydrofuran 334.97
    n-hexyl acetate 193.35
    isooctane 37.21
    2-(2-butoxyethoxy)ethanol 243.15
    sec-butyl acetate 124.31
    tert-butyl acetate 198.84
    decalin 48.95
    glycerin 206.92
    diglyme 425.99
    acrylic acid 160.79
    isopropyl myristate 114.37
    n-butyric acid 182.27
    acetyl acetate 162.07
    di(2-ethylhexyl) phthalate 105.35
    ethyl propionate 152.26
    nitromethane 370.83
    1,2-diethoxyethane 216.7
    benzonitrile 162.51
    trioctyl phosphate 91.78
    1-bromopropane 175.75
    gamma-valerolactone 552.89
    n-decanol 112.45
    triethyl phosphate 111.05
    4-methyl-2-pentanol 111.71
    propionitrile 136.99
    vinylene carbonate 230.35
    1,1,2-trichlorotrifluoroethane 302.0
    DMS 158.84
    cumene 79.63
    2-octanol 125.37
    2-hexanone 183.23
    octyl acetate 136.83
    limonene 127.88
    1,2-dimethoxyethane 450.1
    ethyl orthosilicate 112.22
    tributyl phosphate 98.24
    diacetone alcohol 236.72
    N,N-dimethylaniline 196.25
    acrylonitrile 163.21
    aniline 182.24
    1,3-propanediol 191.13
    bromobenzene 159.52
    dibromomethane 247.97
    1,1,2,2-tetrachloroethane 335.88
    2-methyl-cyclohexyl acetate 143.61
    tetrabutyl urea 143.73
    diisobutyl methanol 97.19
    2-phenylethanol 157.46
    styrene 114.55
    dioctyl adipate 142.27
    dimethyl sulfate 321.41
    ethyl butyrate 153.02
    methyl lactate 177.23
    butyl lactate 147.37
    diethyl carbonate 116.89
    propanediol butyl ether 217.25
    triethyl orthoformate 145.39
    p-tert-butyltoluene 101.83
    methyl 4-tert-butylbenzoate 216.33
    morpholine 390.96
    tert-butylamine 173.78
    n-dodecanol 95.17
    dimethoxymethane 524.23
    ethylene carbonate 201.11
    cyrene 231.8
    2-ethoxyethyl acetate 200.82
    2-ethylhexyl acetate 136.58
    1,2,4-trichlorobenzene 204.82
    4-methylpyridine 286.08
    dibutyl ether 151.78
    2,6-dimethyl-4-heptanol 97.19
    DEF 315.6
    dimethyl isosorbide 341.82
    tetrachloroethylene 226.76
    eugenol 212.49
    triacetin 201.15
    span 80 200.94
    1,4-butanediol 113.75
    1,1-dichloroethane 231.53
    2-methyl-1-pentanol 120.14
    methyl formate 274.91
    2-methyl-1-butanol 144.63
    n-decane 51.11
    butyronitrile 154.35
    3,7-dimethyl-1-octanol 121.05
    1-chlorooctane 109.77
    1-chlorotetradecane 62.54
    n-nonane 51.45
    undecane 41.05
    tert-butylcyclohexane 49.81
    cyclooctane 50.39
    cyclopentanol 227.63
    tetrahydropyran 315.87
    tert-amyl methyl ether 197.13
    2,5,8-trioxanonane 325.28
    1-hexene 112.81
    2-isopropoxyethanol 191.31
    2,2,2-trifluoroethanol 139.44
    methyl butyrate 180.3

    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