Silane, dimethylbis(octadecyloxy)-

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  • Identifiers

    CAS number
    29043-70-7

    Molecular formula
    C38H80O2Si

    SMILES
    CCCCCCCCCCCCCCCCCCO[Si](C)(C)OCCCCCCCCCCCCCCCCCC

    Safety labels

  • Odor profile

    Fragrance
    Waxy 67.28%
    Fatty 51.17%
    Oily 46.13%
    Fruity 32.62%
    Fresh 25.49%
    Odorless 24.64%
    Sweet 23.82%
    Clean 22.91%
    Woody 21.5%
    Balsamic 20.52%

     

    Flavor
    Waxy 55.95%
    Mild 37.3%
    Alkane 35.08%
    Bland 30.84%
    Fatty 29.72%
    Oily 28.53%
    Fat 25.04%
    Faint 24.4%
    Slightly waxy 24.35%
    Wax 23.58%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    9.84 (weak base)

    Molecular weight
    597.1 g/mol

    Flash point

    • 252.95 ˚C est.

  • Synonyms

    • Dimethyldistearoxysilane
    • Silane, dimethylbis(octadecyloxy)-
    • Dimethylbis(octadecyloxy)silane
    • EINECS 249-385-9
    • DTXSID4067430
    • RefChem:182883
    • DTXCID3037911
    • 249-385-9
    • 29043-70-7
    • SCHEMBL8603989
    • DWJGOISYMPVHNX-UHFFFAOYSA-N
    • NS00051354
    • 29043-70-7

  • Applications

    Silane, dimethylbis(octadecyloxy)-, CAS 29043-70-7, is a silane bearing two methyl groups and two octadecyloxy groups. Practically, it is used primarily as a silane coupling agent to improve interfacial adhesion between organic matrices and inorganic substrates such as glass, silica, concrete, and metals in coatings, adhesives, and composites. It also serves as a surface-energy modifier or hydrophobicity-enhancing additive for coatings, paints, sealants, and primers, providing water repellency and reduced wettability. Because of the long octadecyl chains, it can function as a precursor or intermediate for the synthesis of hydrophobic siloxane coatings or specialty polymers. Additionally, it may be considered for surface-treatment applications in electronics or optical coatings where control of surface energy and contamination resistance is desirable, subject to local regulations.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 35.18
    methanol 30.92
    isopropanol 39.02
    water 0.35
    ethyl acetate 376.48
    n-propanol 65.43
    acetone 162.03
    n-butanol 79.33
    acetonitrile 45.82
    DMF 246.07
    toluene 176.43
    isobutanol 73.06
    1,4-dioxane 319.98
    methyl acetate 201.37
    THF 897.9
    2-butanone 285.4
    n-pentanol 76.46
    sec-butanol 87.57
    n-hexane 97.68
    ethylene glycol 4.34
    NMP 922.99
    cyclohexane 386.99
    DMSO 302.4
    n-butyl acetate 489.84
    n-octanol 174.87
    chloroform 1067.73
    n-propyl acetate 424.82
    acetic acid 95.26
    dichloromethane 938.6
    cyclohexanone 921.86
    propylene glycol 13.26
    isopropyl acetate 415.7
    DMAc 607.6
    2-ethoxyethanol 134.64
    isopentanol 102.57
    n-heptane 173.37
    ethyl formate 139.97
    1,2-dichloroethane 523.21
    n-hexanol 87.6
    2-methoxyethanol 116.76
    isobutyl acetate 347.68
    tetrachloromethane 332.58
    n-pentyl acetate 880.51
    transcutol 642.66
    n-heptanol 162.15
    ethylbenzene 146.84
    MIBK 301.97
    2-propoxyethanol 169.79
    tert-butanol 82.32
    MTBE 269.34
    2-butoxyethanol 307.31
    propionic acid 123.74
    o-xylene 185.46
    formic acid 21.15
    diethyl ether 221.26
    m-xylene 143.34
    p-xylene 204.55
    chlorobenzene 289.06
    dimethyl carbonate 125.78
    n-octane 86.1
    formamide 38.11
    cyclopentanone 885.16
    2-pentanone 329.71
    anisole 233.22
    cyclopentyl methyl ether 781.49
    gamma-butyrolactone 827.17
    1-methoxy-2-propanol 153.93
    pyridine 319.13
    3-pentanone 369.04
    furfural 444.33
    n-dodecane 35.36
    diethylene glycol 50.7
    diisopropyl ether 186.08
    tert-amyl alcohol 160.26
    acetylacetone 403.87
    n-hexadecane 43.51
    acetophenone 324.27
    methyl propionate 299.41
    isopentyl acetate 526.23
    trichloroethylene 914.61
    n-nonanol 188.35
    cyclohexanol 262.03
    benzyl alcohol 111.24
    2-ethylhexanol 161.75
    isooctanol 195.53
    dipropyl ether 495.69
    1,2-dichlorobenzene 362.81
    ethyl lactate 154.79
    propylene carbonate 556.47
    n-methylformamide 91.58
    2-pentanol 90.61
    n-pentane 68.97
    1-propoxy-2-propanol 263.55
    1-methoxy-2-propyl acetate 450.1
    2-(2-methoxypropoxy) propanol 235.35
    mesitylene 135.08
    ε-caprolactone 942.52
    p-cymene 187.23
    epichlorohydrin 721.52
    1,1,1-trichloroethane 827.8
    2-aminoethanol 19.06
    morpholine-4-carbaldehyde 518.76
    sulfolane 1276.65
    2,2,4-trimethylpentane 85.33
    2-methyltetrahydrofuran 792.85
    n-hexyl acetate 690.42
    isooctane 40.4
    2-(2-butoxyethoxy)ethanol 297.33
    sec-butyl acetate 420.01
    tert-butyl acetate 574.53
    decalin 143.0
    glycerin 25.94
    diglyme 807.34
    acrylic acid 78.85
    isopropyl myristate 267.26
    n-butyric acid 276.05
    acetyl acetate 276.71
    di(2-ethylhexyl) phthalate 162.18
    ethyl propionate 431.92
    nitromethane 201.39
    1,2-diethoxyethane 532.49
    benzonitrile 152.81
    trioctyl phosphate 148.52
    1-bromopropane 400.98
    gamma-valerolactone 964.59
    n-decanol 118.19
    triethyl phosphate 366.12
    4-methyl-2-pentanol 87.58
    propionitrile 83.34
    vinylene carbonate 399.74
    1,1,2-trichlorotrifluoroethane 493.39
    DMS 303.57
    cumene 127.54
    2-octanol 176.4
    2-hexanone 348.93
    octyl acetate 295.41
    limonene 371.56
    1,2-dimethoxyethane 380.8
    ethyl orthosilicate 397.58
    tributyl phosphate 201.38
    diacetone alcohol 305.31
    N,N-dimethylaniline 215.2
    acrylonitrile 70.11
    aniline 137.85
    1,3-propanediol 41.53
    bromobenzene 384.19
    dibromomethane 676.06
    1,1,2,2-tetrachloroethane 991.8
    2-methyl-cyclohexyl acetate 535.52
    tetrabutyl urea 295.99
    diisobutyl methanol 158.89
    2-phenylethanol 113.41
    styrene 153.59
    dioctyl adipate 369.23
    dimethyl sulfate 293.41
    ethyl butyrate 603.79
    methyl lactate 113.28
    butyl lactate 431.77
    diethyl carbonate 325.98
    propanediol butyl ether 181.21
    triethyl orthoformate 597.79
    p-tert-butyltoluene 177.96
    methyl 4-tert-butylbenzoate 488.33
    morpholine 396.83
    tert-butylamine 77.34
    n-dodecanol 81.78
    dimethoxymethane 241.27
    ethylene carbonate 413.08
    cyrene 272.39
    2-ethoxyethyl acetate 716.86
    2-ethylhexyl acetate 538.01
    1,2,4-trichlorobenzene 440.55
    4-methylpyridine 334.84
    dibutyl ether 529.67
    2,6-dimethyl-4-heptanol 158.89
    DEF 454.8
    dimethyl isosorbide 632.89
    tetrachloroethylene 621.14
    eugenol 273.52
    triacetin 648.55
    span 80 266.76
    1,4-butanediol 21.99
    1,1-dichloroethane 473.39
    2-methyl-1-pentanol 105.66
    methyl formate 75.99
    2-methyl-1-butanol 113.33
    n-decane 95.16
    butyronitrile 112.02
    3,7-dimethyl-1-octanol 182.16
    1-chlorooctane 285.45
    1-chlorotetradecane 87.17
    n-nonane 96.52
    undecane 53.15
    tert-butylcyclohexane 106.07
    cyclooctane 154.94
    cyclopentanol 234.44
    tetrahydropyran 647.09
    tert-amyl methyl ether 370.98
    2,5,8-trioxanonane 408.73
    1-hexene 149.57
    2-isopropoxyethanol 143.16
    2,2,2-trifluoroethanol 74.23
    methyl butyrate 515.73

    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