Stearyl trisiloxane

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  • Identifiers

    CAS number
    167160-55-6

    Molecular formula
    C25H58O2Si3

    SMILES
    CCCCCCCCCCCCCCCCCC[Si](C)(O[Si](C)(C)C)O[Si](C)(C)C

    Safety labels

  • Odor profile

    Fragrance
    Waxy 54.3%
    Floral 42.96%
    Woody 41.73%
    Fresh 34.86%
    Fatty 33.48%
    Oily 32.81%
    Sweet 28.51%
    Clean 26.58%
    Balsamic 26.2%
    Green 26.12%

     

    Flavor
    Mild 38.16%
    Waxy 35.04%
    Oily 28.33%
    Bland 24.89%
    Delicate 22.74%
    Rose acetate 21.43%
    Leathery 21.43%
    Slightly waxy 21.34%
    Beer 21.33%
    Yeasty 21.08%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    8.58 (weak base)

    Molecular weight
    475.0 g/mol

    Flash point

    • 157.22 ˚C est.

  • Synonyms

    • Stearyl trisiloxane
    • 167160-55-6
    • Stearyl trimethicone
    • UNII-796MG354ZZ
    • Tm 181
    • 796MG354ZZ
    • OCTADECYLHEPTAMETHYLTRISILOXANE
    • Bis(trimethylsiloxy)octadecylmethylsilane
    • DTXSID80168238
    • RefChem:185428
    • DTXCID3090729
    • STEARYL TRIMETHICONE [INCI]
    • trimethyl-(methyl-octadecyl-trimethylsilyloxysilyl)oxysilane
    • 1,1,1,3,5,5,5-Heptamethyl-3-octadecyltrisiloxane
    • Trisiloxane, 1,1,1,3,5,5,5-heptamethyl-3-octadecyl-
    • octadecylheptamethyltrisiloxane,95per cent
    • SCHEMBL5711705
    • n-Octadecylheptamethyltrisiloxane
    • MFCD09953880
    • Q27266725
    • 167160-55-6

  • Applications

    Stearyl trisiloxane (CAS 167160-55-6) is a long-chain siloxane bearing a stearyl group, used as a surface-modifying additive and lubricant in numerous formulations. Typical applications include: improving leveling and wetting in coatings/inks; acting as a processing aid and mold-release agent in polymers/plastics; functioning as an emollient and conditioning agent in cosmetics/personal care; serving as a silicone oil in household care and cleaning formulations to enhance slip and water beading on surfaces; in textile finishing to improve water repellency and ease of care; and may be considered for cleaning formulations as a light lubricant additive, subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 209.96
    methanol 149.79
    isopropanol 185.09
    water 0.76
    ethyl acetate 515.32
    n-propanol 283.43
    acetone 394.93
    n-butanol 280.68
    acetonitrile 96.42
    DMF 640.29
    toluene 403.85
    isobutanol 253.63
    1,4-dioxane 581.16
    methyl acetate 331.24
    THF 1897.02
    2-butanone 537.65
    n-pentanol 262.77
    sec-butanol 292.6
    n-hexane 240.81
    ethylene glycol 20.22
    NMP 1589.36
    cyclohexane 563.14
    DMSO 586.22
    n-butyl acetate 624.88
    n-octanol 320.11
    chloroform 1202.0
    n-propyl acetate 577.31
    acetic acid 212.04
    dichloromethane 1055.73
    cyclohexanone 1417.59
    propylene glycol 64.83
    isopropyl acetate 508.06
    DMAc 903.45
    2-ethoxyethanol 282.2
    isopentanol 265.83
    n-heptane 303.06
    ethyl formate 247.66
    1,2-dichloroethane 642.3
    n-hexanol 279.89
    2-methoxyethanol 317.96
    isobutyl acetate 500.81
    tetrachloromethane 323.61
    n-pentyl acetate 927.87
    transcutol 761.82
    n-heptanol 315.52
    ethylbenzene 269.37
    MIBK 468.49
    2-propoxyethanol 398.94
    tert-butanol 250.74
    MTBE 408.25
    2-butoxyethanol 458.0
    propionic acid 272.89
    o-xylene 286.5
    formic acid 47.97
    diethyl ether 479.28
    m-xylene 291.41
    p-xylene 356.58
    chlorobenzene 480.34
    dimethyl carbonate 191.6
    n-octane 129.18
    formamide 81.84
    cyclopentanone 1531.64
    2-pentanone 579.67
    anisole 401.05
    cyclopentyl methyl ether 1302.41
    gamma-butyrolactone 1325.91
    1-methoxy-2-propanol 372.35
    pyridine 623.3
    3-pentanone 545.48
    furfural 730.88
    n-dodecane 59.95
    diethylene glycol 137.86
    diisopropyl ether 297.17
    tert-amyl alcohol 325.69
    acetylacetone 564.18
    n-hexadecane 70.31
    acetophenone 462.72
    methyl propionate 472.56
    isopentyl acetate 577.8
    trichloroethylene 1055.27
    n-nonanol 318.74
    cyclohexanol 585.33
    benzyl alcohol 252.03
    2-ethylhexanol 295.1
    isooctanol 308.04
    dipropyl ether 707.51
    1,2-dichlorobenzene 470.02
    ethyl lactate 224.94
    propylene carbonate 780.57
    n-methylformamide 242.37
    2-pentanol 269.05
    n-pentane 182.39
    1-propoxy-2-propanol 459.67
    1-methoxy-2-propyl acetate 552.11
    2-(2-methoxypropoxy) propanol 307.59
    mesitylene 204.51
    ε-caprolactone 1284.75
    p-cymene 227.71
    epichlorohydrin 991.99
    1,1,1-trichloroethane 763.68
    2-aminoethanol 85.36
    morpholine-4-carbaldehyde 868.46
    sulfolane 1762.69
    2,2,4-trimethylpentane 124.81
    2-methyltetrahydrofuran 1414.97
    n-hexyl acetate 887.73
    isooctane 72.42
    2-(2-butoxyethoxy)ethanol 440.96
    sec-butyl acetate 489.08
    tert-butyl acetate 626.61
    decalin 216.31
    glycerin 87.16
    diglyme 855.07
    acrylic acid 180.45
    isopropyl myristate 352.04
    n-butyric acid 487.57
    acetyl acetate 304.35
    di(2-ethylhexyl) phthalate 257.24
    ethyl propionate 504.64
    nitromethane 335.02
    1,2-diethoxyethane 566.85
    benzonitrile 290.07
    trioctyl phosphate 241.03
    1-bromopropane 590.96
    gamma-valerolactone 1464.02
    n-decanol 215.08
    triethyl phosphate 319.65
    4-methyl-2-pentanol 196.27
    propionitrile 178.16
    vinylene carbonate 555.93
    1,1,2-trichlorotrifluoroethane 593.14
    DMS 372.25
    cumene 207.67
    2-octanol 296.91
    2-hexanone 557.34
    octyl acetate 432.25
    limonene 431.84
    1,2-dimethoxyethane 551.88
    ethyl orthosilicate 346.79
    tributyl phosphate 267.92
    diacetone alcohol 442.09
    N,N-dimethylaniline 341.43
    acrylonitrile 151.39
    aniline 320.45
    1,3-propanediol 147.15
    bromobenzene 586.59
    dibromomethane 845.96
    1,1,2,2-tetrachloroethane 1072.98
    2-methyl-cyclohexyl acetate 619.27
    tetrabutyl urea 406.65
    diisobutyl methanol 223.61
    2-phenylethanol 273.48
    styrene 307.36
    dioctyl adipate 449.43
    dimethyl sulfate 340.3
    ethyl butyrate 620.62
    methyl lactate 200.05
    butyl lactate 530.06
    diethyl carbonate 331.72
    propanediol butyl ether 339.31
    triethyl orthoformate 546.52
    p-tert-butyltoluene 235.85
    methyl 4-tert-butylbenzoate 559.32
    morpholine 809.25
    tert-butylamine 222.26
    n-dodecanol 156.63
    dimethoxymethane 511.19
    ethylene carbonate 565.56
    cyrene 399.6
    2-ethoxyethyl acetate 757.75
    2-ethylhexyl acetate 576.91
    1,2,4-trichlorobenzene 573.18
    4-methylpyridine 667.68
    dibutyl ether 589.13
    2,6-dimethyl-4-heptanol 223.61
    DEF 707.26
    dimethyl isosorbide 726.76
    tetrachloroethylene 649.3
    eugenol 388.54
    triacetin 672.98
    span 80 433.82
    1,4-butanediol 74.48
    1,1-dichloroethane 586.19
    2-methyl-1-pentanol 251.25
    methyl formate 180.0
    2-methyl-1-butanol 298.04
    n-decane 140.34
    butyronitrile 241.93
    3,7-dimethyl-1-octanol 286.55
    1-chlorooctane 379.3
    1-chlorotetradecane 135.53
    n-nonane 148.23
    undecane 85.07
    tert-butylcyclohexane 176.15
    cyclooctane 234.96
    cyclopentanol 591.45
    tetrahydropyran 1192.65
    tert-amyl methyl ether 491.12
    2,5,8-trioxanonane 485.86
    1-hexene 393.68
    2-isopropoxyethanol 275.01
    2,2,2-trifluoroethanol 108.56
    methyl butyrate 626.72

    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