Hexyltrimethoxysilane

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  • Identifiers

    CAS number
    3069-19-0

    Molecular formula
    C9H22O3Si

    SMILES
    CCCCCC[Si](OC)(OC)OC

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Green 69.15%
    Fresh 48.19%
    Fruity 47.56%
    Floral 46.9%
    Sweet 39.22%
    Oily 37.08%
    Herbal 36.45%
    Waxy 36.05%
    Citrus 34.98%
    Leafy 30.69%

     

    Flavor
    Green 69.15%
    Fruity 67.15%
    Sweet 42.23%
    Waxy 35.25%
    Tropical 34.13%
    Earthy 33.63%
    Floral 31.47%
    Vegetable 28.89%
    Apple 28.56%
    Wine 28.55%

     

    Odor impact est.
    Medium

  • Properties

    pKa est.
    10.74 (weak base)

    Molecular weight
    206.35 g/mol

    Flash point

    • 70.28 ˚C est.

  • Synonyms

    • Hexyltrimethoxysilane
    • 3069-19-0
    • n-hexyltrimethoxysilane
    • Silane, hexyltrimethoxy-
    • 9AUI936HIC
    • EINECS 221-331-9
    • DTXSID7062825
    • MPT-132
    • AY 43-206M
    • RefChem:788328
    • DTXCID2038233
    • HEXYLTRIMETHOXYSILANE [INCI]
    • 221-331-9
    • hexyl(trimethoxy)silane
    • MFCD00039801
    • S09975
    • 89885-27-8
    • UNII-9AUI936HIC
    • hexyl-trimethoxysilane
    • Hexyltri(methoxy)silane
    • SCHEMBL26340
    • SCHEMBL2360955
    • SCHEMBL2360956
    • SCHEMBL12814376
    • SCHEMBL28044097
    • CZWLNMOIEMTDJY-UHFFFAOYSA-
    • AKOS015839673
    • AS-58310
    • DB-047837
    • CS-0197135
    • H0879
    • NS00046322
    • F71583
    • Q27272282
    • InChI=1/C9H22O3Si/c1-5-6-7-8-9-13(10-2,11-3)12-4/h5-9H2,1-4H3
    • 3069-19-0

  • Applications

    Hexyltrimethoxysilane (CAS 3069-19-0) functions primarily as a silane coupling agent and surface modifier for inorganic–organic interfaces. In coatings, adhesives and sealants, it hydrolyzes and condenses to form siloxane bonds that improve adhesion between glass, silica and metal oxides and organic polymers, enhancing durability. It also acts as a hydrophobic surface modifier, imparting water-repellency to glass, ceramics, fillers and coating substrates through its hexyl moiety. Additionally, it is used to treat silica fillers and pigments to boost dispersion and compatibility in polymer matrices, enabling better composite performance. In sol-gel and related formulations, it serves as a network-forming precursor to create hydrophobic silica-containing coatings and inks. As a processing aid in specialty coatings and sealants, it supports network formation and moisture resistance by forming covalent Si–O–Si linkages at interfaces.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 4951.98
    methanol 5901.92
    isopropanol 3672.66
    water 8.93
    ethyl acetate 2086.79
    n-propanol 4670.66
    acetone 2177.18
    n-butanol 4076.57
    acetonitrile 2007.18
    DMF 3062.47
    toluene 959.85
    isobutanol 3048.63
    1,4-dioxane 4161.09
    methyl acetate 1758.66
    THF 4997.36
    2-butanone 1970.02
    n-pentanol 2640.58
    sec-butanol 3574.88
    n-hexane 556.88
    ethylene glycol 792.35
    NMP 2161.01
    cyclohexane 1331.91
    DMSO 2973.94
    n-butyl acetate 2280.12
    n-octanol 1265.1
    chloroform 8884.38
    n-propyl acetate 1795.18
    acetic acid 3574.63
    dichloromethane 6094.77
    cyclohexanone 3261.97
    propylene glycol 1352.69
    isopropyl acetate 1408.73
    DMAc 1926.87
    2-ethoxyethanol 3168.16
    isopentanol 2715.17
    n-heptane 610.54
    ethyl formate 1932.08
    1,2-dichloroethane 3243.83
    n-hexanol 2627.84
    2-methoxyethanol 4505.95
    isobutyl acetate 1083.22
    tetrachloromethane 2022.11
    n-pentyl acetate 1755.31
    transcutol 3882.33
    n-heptanol 1593.49
    ethylbenzene 515.7
    MIBK 1139.83
    2-propoxyethanol 2910.32
    tert-butanol 3915.53
    MTBE 2952.19
    2-butoxyethanol 2275.92
    propionic acid 2585.98
    o-xylene 639.67
    formic acid 1633.64
    diethyl ether 3503.61
    m-xylene 615.02
    p-xylene 688.32
    chlorobenzene 1394.27
    dimethyl carbonate 556.5
    n-octane 240.52
    formamide 2145.28
    cyclopentanone 2737.1
    2-pentanone 1893.76
    anisole 1071.62
    cyclopentyl methyl ether 2621.18
    gamma-butyrolactone 2817.75
    1-methoxy-2-propanol 2762.79
    pyridine 2743.46
    3-pentanone 1264.7
    furfural 2534.13
    n-dodecane 110.78
    diethylene glycol 1693.83
    diisopropyl ether 951.87
    tert-amyl alcohol 3324.9
    acetylacetone 1289.85
    n-hexadecane 123.86
    acetophenone 893.5
    methyl propionate 1383.53
    isopentyl acetate 1772.33
    trichloroethylene 5588.2
    n-nonanol 1005.48
    cyclohexanol 3397.18
    benzyl alcohol 1105.31
    2-ethylhexanol 1490.82
    isooctanol 1297.56
    dipropyl ether 1855.99
    1,2-dichlorobenzene 1249.93
    ethyl lactate 726.21
    propylene carbonate 1800.41
    n-methylformamide 2536.95
    2-pentanol 2553.35
    n-pentane 763.09
    1-propoxy-2-propanol 2196.39
    1-methoxy-2-propyl acetate 1310.92
    2-(2-methoxypropoxy) propanol 807.34
    mesitylene 460.53
    ε-caprolactone 2911.86
    p-cymene 539.15
    epichlorohydrin 3412.6
    1,1,1-trichloroethane 3535.23
    2-aminoethanol 2328.09
    morpholine-4-carbaldehyde 2571.69
    sulfolane 2813.58
    2,2,4-trimethylpentane 383.04
    2-methyltetrahydrofuran 4010.89
    n-hexyl acetate 1758.07
    isooctane 264.47
    2-(2-butoxyethoxy)ethanol 1467.73
    sec-butyl acetate 1092.91
    tert-butyl acetate 1504.91
    decalin 335.09
    glycerin 1542.64
    diglyme 3092.67
    acrylic acid 1836.42
    isopropyl myristate 499.44
    n-butyric acid 3941.28
    acetyl acetate 1073.65
    di(2-ethylhexyl) phthalate 430.45
    ethyl propionate 1149.14
    nitromethane 3739.14
    1,2-diethoxyethane 1974.2
    benzonitrile 1427.08
    trioctyl phosphate 411.93
    1-bromopropane 2607.67
    gamma-valerolactone 3653.42
    n-decanol 626.37
    triethyl phosphate 576.05
    4-methyl-2-pentanol 1164.92
    propionitrile 2174.38
    vinylene carbonate 1769.07
    1,1,2-trichlorotrifluoroethane 3049.64
    DMS 636.99
    cumene 388.64
    2-octanol 1194.89
    2-hexanone 1577.31
    octyl acetate 675.93
    limonene 963.95
    1,2-dimethoxyethane 3464.83
    ethyl orthosilicate 712.56
    tributyl phosphate 464.95
    diacetone alcohol 1452.28
    N,N-dimethylaniline 743.28
    acrylonitrile 2113.23
    aniline 1410.71
    1,3-propanediol 3077.6
    bromobenzene 1443.93
    dibromomethane 4461.73
    1,1,2,2-tetrachloroethane 5451.68
    2-methyl-cyclohexyl acetate 1025.21
    tetrabutyl urea 556.32
    diisobutyl methanol 859.84
    2-phenylethanol 1104.04
    styrene 671.54
    dioctyl adipate 593.94
    dimethyl sulfate 734.73
    ethyl butyrate 1430.08
    methyl lactate 764.59
    butyl lactate 1182.34
    diethyl carbonate 860.08
    propanediol butyl ether 1522.85
    triethyl orthoformate 1220.36
    p-tert-butyltoluene 555.63
    methyl 4-tert-butylbenzoate 914.01
    morpholine 5557.39
    tert-butylamine 2944.69
    n-dodecanol 433.48
    dimethoxymethane 2025.36
    ethylene carbonate 1743.12
    cyrene 819.84
    2-ethoxyethyl acetate 1506.91
    2-ethylhexyl acetate 1457.7
    1,2,4-trichlorobenzene 1385.75
    4-methylpyridine 2273.08
    dibutyl ether 1325.2
    2,6-dimethyl-4-heptanol 859.84
    DEF 2129.0
    dimethyl isosorbide 1181.98
    tetrachloroethylene 3833.72
    eugenol 840.62
    triacetin 973.72
    span 80 1003.25
    1,4-butanediol 1355.68
    1,1-dichloroethane 3483.27
    2-methyl-1-pentanol 1914.51
    methyl formate 1526.86
    2-methyl-1-butanol 2814.04
    n-decane 251.66
    butyronitrile 2841.4
    3,7-dimethyl-1-octanol 1011.42
    1-chlorooctane 790.67
    1-chlorotetradecane 233.28
    n-nonane 278.97
    undecane 150.98
    tert-butylcyclohexane 332.77
    cyclooctane 449.48
    cyclopentanol 3046.08
    tetrahydropyran 5020.82
    tert-amyl methyl ether 2092.7
    2,5,8-trioxanonane 1421.79
    1-hexene 1311.44
    2-isopropoxyethanol 1895.19
    2,2,2-trifluoroethanol 1267.14
    methyl butyrate 1835.04

    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