Stearoxytrimethylsilane

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  • Identifiers

    CAS number
    18748-98-6

    Molecular formula
    C21H46OSi

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

    Safety labels

  • Odor profile

    Fragrance
    Waxy 67.02%
    Fatty 48.29%
    Oily 44.98%
    Fruity 34.25%
    Fresh 31.65%
    Floral 27.87%
    Clean 27.72%
    Woody 26.34%
    Sweet 25.2%
    Citrus 23.65%

     

    Flavor
    Waxy 49.59%
    Mild 36.7%
    Alkane 35.51%
    Oily 30.37%
    Bland 27.75%
    Delicate 24.32%
    Slightly waxy 23.62%
    Fat 23.25%
    Flower 23.21%
    Beer 22.46%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    9.2 (weak base)

    Molecular weight
    342.7 g/mol

    Flash point

    • 150.37 ˚C est.

  • Synonyms

    • Trimethyl(octadecyloxy)silane
    • 18748-98-6
    • Silane, trimethyl(octadecyloxy)-
    • Stearoxytrimethylsilane
    • stearoxy trimethylsilane
    • stearyloxytrimethylsilane
    • stearoxy trimethyl silane
    • EINECS 242-554-8
    • 9862TW94B2
    • SILCARE SILICONE 1M71
    • DTXSID5066405
    • STEAROXYTRIMETHYLSILANE [II]
    • STEAROXYTRIMETHYLSILANE (II)
    • RefChem:889157
    • Silane, trimethyl(octadecyloxy)
    • DTXCID4035914
    • STEAROXYTRIMETHYLSILANE [INCI]
    • 242-554-8
    • EINECS 242-553-2
    • trimethyl(octadecoxy)silane
    • 1-Octadecanol, TMS derivative
    • UNII-9862TW94B2
    • 1-Octadecanol, O-TMS
    • Octadecoxy-trimethylsilane
    • Trimethyl stearyloxysilane
    • Trimethyl(Ctadecyloxy)Silane
    • (Octadecyloxy)trimethylsilane
    • 1-Trimethylsilyloxyoctadecane
    • Octadecan-1-ol, TMS ether
    • Octadecyl trimethylsilyl ether
    • SCHEMBL155827
    • 1-(Trimethylsilyloxy)octadecane
    • Octadecane, 1-trimethylsilyloxy-
    • 1-Octadecanol, trimethylsilyl ether
    • MFCD01940847
    • NS00047400
    • Q27272086
    • 18748-98-6

  • Applications

    Stearoxytrimethylsilane, CAS 18748-98-6, is commonly employed as a hydrophobic silane coupling agent and surface modifier in several industries: in coatings and inks to improve wetting and adhesion; in polymers and plastics to enhance interfacial bonding with fillers and pigments and to aid dispersion; in adhesives and sealants as a surface-active promoter that boosts bonding to various substrates; in plastics processing as a processing aid and slip modifier to reduce friction and improve handling; in electronics and related protective coatings to improve adhesion of coatings and encapsulants; and as an intermediate in the synthesis of other organosilicon compounds.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 204.56
    methanol 107.59
    isopropanol 272.23
    water 0.06
    ethyl acetate 873.08
    n-propanol 334.52
    acetone 474.55
    n-butanol 412.48
    acetonitrile 125.0
    DMF 402.8
    toluene 467.04
    isobutanol 342.47
    1,4-dioxane 1011.71
    methyl acetate 444.72
    THF 2596.24
    2-butanone 711.88
    n-pentanol 340.57
    sec-butanol 435.55
    n-hexane 565.56
    ethylene glycol 12.19
    NMP 1025.27
    cyclohexane 1871.14
    DMSO 573.99
    n-butyl acetate 1360.94
    n-octanol 487.92
    chloroform 1922.58
    n-propyl acetate 1077.06
    acetic acid 182.69
    dichloromethane 1562.03
    cyclohexanone 1862.14
    propylene glycol 46.93
    isopropyl acetate 969.43
    DMAc 804.72
    2-ethoxyethanol 390.85
    isopentanol 481.69
    n-heptane 1112.16
    ethyl formate 304.21
    1,2-dichloroethane 1094.42
    n-hexanol 475.93
    2-methoxyethanol 367.56
    isobutyl acetate 926.0
    tetrachloromethane 621.17
    n-pentyl acetate 1528.16
    transcutol 1713.06
    n-heptanol 499.08
    ethylbenzene 378.8
    MIBK 817.92
    2-propoxyethanol 598.37
    tert-butanol 508.5
    MTBE 997.41
    2-butoxyethanol 698.92
    propionic acid 271.89
    o-xylene 422.18
    formic acid 25.46
    diethyl ether 1043.93
    m-xylene 374.66
    p-xylene 521.57
    chlorobenzene 542.91
    dimethyl carbonate 163.76
    n-octane 358.28
    formamide 50.0
    cyclopentanone 1567.82
    2-pentanone 878.36
    anisole 583.07
    cyclopentyl methyl ether 1961.57
    gamma-butyrolactone 1256.41
    1-methoxy-2-propanol 468.21
    pyridine 698.59
    3-pentanone 838.86
    furfural 650.62
    n-dodecane 142.05
    diethylene glycol 171.64
    diisopropyl ether 743.28
    tert-amyl alcohol 631.59
    acetylacetone 766.43
    n-hexadecane 171.76
    acetophenone 599.77
    methyl propionate 581.58
    isopentyl acetate 1281.56
    trichloroethylene 1421.19
    n-nonanol 513.71
    cyclohexanol 957.56
    benzyl alcohol 267.21
    2-ethylhexanol 695.94
    isooctanol 559.83
    dipropyl ether 2116.95
    1,2-dichlorobenzene 612.45
    ethyl lactate 315.21
    propylene carbonate 848.21
    n-methylformamide 150.88
    2-pentanol 467.52
    n-pentane 424.68
    1-propoxy-2-propanol 911.14
    1-methoxy-2-propyl acetate 1007.5
    2-(2-methoxypropoxy) propanol 513.57
    mesitylene 331.85
    ε-caprolactone 1577.62
    p-cymene 477.45
    epichlorohydrin 1282.08
    1,1,1-trichloroethane 1479.01
    2-aminoethanol 63.06
    morpholine-4-carbaldehyde 802.57
    sulfolane 1620.15
    2,2,4-trimethylpentane 286.01
    2-methyltetrahydrofuran 2027.09
    n-hexyl acetate 1336.11
    isooctane 188.84
    2-(2-butoxyethoxy)ethanol 727.81
    sec-butyl acetate 992.63
    tert-butyl acetate 1238.75
    decalin 524.71
    glycerin 72.24
    diglyme 1615.22
    acrylic acid 135.94
    isopropyl myristate 638.27
    n-butyric acid 663.09
    acetyl acetate 535.13
    di(2-ethylhexyl) phthalate 312.59
    ethyl propionate 912.56
    nitromethane 295.42
    1,2-diethoxyethane 1486.05
    benzonitrile 341.19
    trioctyl phosphate 315.95
    1-bromopropane 1164.94
    gamma-valerolactone 1442.08
    n-decanol 357.07
    triethyl phosphate 663.19
    4-methyl-2-pentanol 374.91
    propionitrile 271.58
    vinylene carbonate 552.13
    1,1,2-trichlorotrifluoroethane 737.76
    DMS 515.2
    cumene 331.83
    2-octanol 485.14
    2-hexanone 884.78
    octyl acetate 659.75
    limonene 973.67
    1,2-dimethoxyethane 1019.36
    ethyl orthosilicate 759.21
    tributyl phosphate 397.5
    diacetone alcohol 719.31
    N,N-dimethylaniline 466.8
    acrylonitrile 182.65
    aniline 337.05
    1,3-propanediol 161.56
    bromobenzene 720.26
    dibromomethane 1355.52
    1,1,2,2-tetrachloroethane 1711.65
    2-methyl-cyclohexyl acetate 1160.24
    tetrabutyl urea 567.48
    diisobutyl methanol 631.08
    2-phenylethanol 328.95
    styrene 393.14
    dioctyl adipate 741.62
    dimethyl sulfate 299.94
    ethyl butyrate 1500.0
    methyl lactate 189.89
    butyl lactate 765.26
    diethyl carbonate 753.16
    propanediol butyl ether 428.57
    triethyl orthoformate 1339.65
    p-tert-butyltoluene 456.1
    methyl 4-tert-butylbenzoate 727.79
    morpholine 1180.99
    tert-butylamine 487.1
    n-dodecanol 263.83
    dimethoxymethane 516.43
    ethylene carbonate 657.91
    cyrene 444.55
    2-ethoxyethyl acetate 1161.83
    2-ethylhexyl acetate 1268.49
    1,2,4-trichlorobenzene 675.25
    4-methylpyridine 689.16
    dibutyl ether 1577.57
    2,6-dimethyl-4-heptanol 631.08
    DEF 918.91
    dimethyl isosorbide 1034.49
    tetrachloroethylene 1041.09
    eugenol 451.97
    triacetin 1110.65
    span 80 589.93
    1,4-butanediol 72.43
    1,1-dichloroethane 1034.69
    2-methyl-1-pentanol 394.59
    methyl formate 112.23
    2-methyl-1-butanol 456.62
    n-decane 341.86
    butyronitrile 408.16
    3,7-dimethyl-1-octanol 578.48
    1-chlorooctane 762.09
    1-chlorotetradecane 271.9
    n-nonane 369.69
    undecane 204.4
    tert-butylcyclohexane 412.18
    cyclooctane 714.04
    cyclopentanol 769.0
    tetrahydropyran 2149.04
    tert-amyl methyl ether 1058.51
    2,5,8-trioxanonane 874.47
    1-hexene 724.93
    2-isopropoxyethanol 441.48
    2,2,2-trifluoroethanol 94.82
    methyl butyrate 1079.67

    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