Trimethyl pentaphenyl trisiloxane

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  • Identifiers

    CAS number
    3390-61-2

    Molecular formula
    C33H34O2Si3

    SMILES
    C[Si](C1=CC=CC=C1)(C2=CC=CC=C2)O[Si](C)(C3=CC=CC=C3)O[Si](C)(C4=CC=CC=C4)C5=CC=CC=C5

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Floral 67.38%
    Rose 51.17%
    Green 49.71%
    Fruity 45.51%
    Balsamic 38.29%
    Sweet 31.68%
    Fresh 31.45%
    Metallic 27.06%
    Earthy 26.0%
    Geranium 25.97%

     

    Flavor
    Bitter 40.72%
    Green 37.49%
    Fruity 34.12%
    Floral 28.6%
    Rose 26.15%
    Sweet 22.78%
    Waxy 21.17%
    Earthy 20.5%
    Balsam 19.48%
    Herbal 18.98%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    6.71 (neutral)

    Molecular weight
    546.9 g/mol

    Flash point

    • 218.34 ˚C est.

  • Synonyms

    • 3390-61-2
    • 1,3,5-Trimethyl-1,1,3,5,5-pentaphenyltrisiloxane
    • Trimethyl pentaphenyl trisiloxane
    • Dow Corning 555
    • Dow Corning 705
    • Pentaphenyltrimethyltrisiloxane
    • Trisiloxane, 1,3,5-trimethyl-1,1,3,5,5-pentaphenyl-
    • 28855-11-0
    • EINECS 222-222-9
    • HE7ABK56N5
    • DTXSID7063007
    • TRIMETHYLPENTAPHENYL TRISOLOXANE
    • RefChem:899749
    • DTXCID4038762
    • Dow Corning 705 silicone diffusion pump
    • TRIMETHYL PENTAPHENYL TRISILOXANE [INCI]
    • Trisiloxane, 1,3,5trimethyl1,1,3,5,5pentaphenyl
    • 222-222-9
    • 1,1,3,5,5-Pentaphenyl-1,3,5-trimethyltrisiloxane
    • methyl-bis[[methyl(diphenyl)silyl]oxy]-phenylsilane
    • MFCD00053659
    • C33H34O2Si3
    • Silicone DC 705
    • UNII-HE7ABK56N5
    • SCHEMBL419488
    • methyl-bis[[methyl(diphenyl)silyl]oxy]-phenyl-silane
    • CS-0451259
    • NS00049946
    • 1,1,2,3,3-Pentaphenyl 1,2,3 trimethyltrisiloxane
    • 1,3,5-trimethyl-1,1,3,5,5-pentaphenyl-trisiloxane
    • Q27279885
    • 3390-61-2

  • Applications

    Trimethyl pentaphenyl trisiloxane (CAS 3390-61-2) is primarily used as an intermediate in silicone chemistry and as a surface-modifying additive for coatings, inks, and adhesives to improve surface properties and adhesion; it is evaluated as a specialty additive for polymers/plastics to influence optical and thermal stability of materials; due to its phenyl-rich framework, it is often considered for electronics-related applications and optical coatings, such as encapsulation or protective layers where thermal and chemical resistance are advantageous; in industrial manufacturing it may serve as a processing aid or surface-treatment agent depending on local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 5.68
    methanol 2.93
    isopropanol 3.74
    water 0.02
    ethyl acetate 24.15
    n-propanol 8.85
    acetone 16.33
    n-butanol 9.08
    acetonitrile 4.57
    DMF 65.01
    toluene 32.26
    isobutanol 6.33
    1,4-dioxane 36.08
    methyl acetate 17.44
    THF 189.42
    2-butanone 31.84
    n-pentanol 8.45
    sec-butanol 7.95
    n-hexane 3.36
    ethylene glycol 0.57
    NMP 163.02
    cyclohexane 5.58
    DMSO 27.39
    n-butyl acetate 30.85
    n-octanol 8.45
    chloroform 199.96
    n-propyl acetate 20.28
    acetic acid 8.77
    dichloromethane 166.95
    cyclohexanone 73.78
    propylene glycol 1.81
    isopropyl acetate 20.75
    DMAc 104.01
    2-ethoxyethanol 11.63
    isopentanol 7.83
    n-heptane 5.7
    ethyl formate 13.65
    1,2-dichloroethane 68.83
    n-hexanol 11.41
    2-methoxyethanol 13.48
    isobutyl acetate 16.67
    tetrachloromethane 16.84
    n-pentyl acetate 32.65
    transcutol 23.22
    n-heptanol 10.98
    ethylbenzene 15.99
    MIBK 21.26
    2-propoxyethanol 23.74
    tert-butanol 4.4
    MTBE 15.51
    2-butoxyethanol 22.03
    propionic acid 10.61
    o-xylene 16.01
    formic acid 2.38
    diethyl ether 21.85
    m-xylene 16.83
    p-xylene 15.26
    chlorobenzene 55.7
    dimethyl carbonate 19.34
    n-octane 2.21
    formamide 5.45
    cyclopentanone 128.68
    2-pentanone 32.65
    anisole 29.64
    cyclopentyl methyl ether 67.48
    gamma-butyrolactone 113.66
    1-methoxy-2-propanol 14.57
    pyridine 75.58
    3-pentanone 31.64
    furfural 75.44
    n-dodecane 1.28
    diethylene glycol 5.93
    diisopropyl ether 7.56
    tert-amyl alcohol 8.89
    acetylacetone 30.22
    n-hexadecane 1.52
    acetophenone 32.24
    methyl propionate 30.03
    isopentyl acetate 29.22
    trichloroethylene 183.03
    n-nonanol 9.67
    cyclohexanol 13.31
    benzyl alcohol 14.97
    2-ethylhexanol 12.25
    isooctanol 9.72
    dipropyl ether 27.43
    1,2-dichlorobenzene 52.32
    ethyl lactate 10.13
    propylene carbonate 52.13
    n-methylformamide 16.09
    2-pentanol 7.38
    n-pentane 3.32
    1-propoxy-2-propanol 22.16
    1-methoxy-2-propyl acetate 37.42
    2-(2-methoxypropoxy) propanol 18.12
    mesitylene 9.14
    ε-caprolactone 67.02
    p-cymene 12.1
    epichlorohydrin 134.55
    1,1,1-trichloroethane 54.97
    2-aminoethanol 2.65
    morpholine-4-carbaldehyde 75.48
    sulfolane 126.14
    2,2,4-trimethylpentane 2.6
    2-methyltetrahydrofuran 86.34
    n-hexyl acetate 29.1
    isooctane 1.3
    2-(2-butoxyethoxy)ethanol 20.42
    sec-butyl acetate 17.25
    tert-butyl acetate 23.59
    decalin 3.62
    glycerin 2.96
    diglyme 40.56
    acrylic acid 9.57
    isopropyl myristate 12.97
    n-butyric acid 18.87
    acetyl acetate 14.85
    di(2-ethylhexyl) phthalate 14.48
    ethyl propionate 22.13
    nitromethane 20.35
    1,2-diethoxyethane 22.94
    benzonitrile 22.29
    trioctyl phosphate 9.95
    1-bromopropane 47.86
    gamma-valerolactone 124.17
    n-decanol 6.69
    triethyl phosphate 16.07
    4-methyl-2-pentanol 5.45
    propionitrile 10.17
    vinylene carbonate 48.16
    1,1,2-trichlorotrifluoroethane 63.44
    DMS 22.52
    cumene 9.25
    2-octanol 8.22
    2-hexanone 24.92
    octyl acetate 16.34
    limonene 18.27
    1,2-dimethoxyethane 29.88
    ethyl orthosilicate 16.83
    tributyl phosphate 11.44
    diacetone alcohol 18.6
    N,N-dimethylaniline 25.27
    acrylonitrile 12.07
    aniline 22.38
    1,3-propanediol 4.23
    bromobenzene 69.39
    dibromomethane 101.13
    1,1,2,2-tetrachloroethane 131.24
    2-methyl-cyclohexyl acetate 28.54
    tetrabutyl urea 20.48
    diisobutyl methanol 7.29
    2-phenylethanol 19.0
    styrene 18.3
    dioctyl adipate 19.98
    dimethyl sulfate 37.5
    ethyl butyrate 29.05
    methyl lactate 12.77
    butyl lactate 20.52
    diethyl carbonate 16.32
    propanediol butyl ether 11.88
    triethyl orthoformate 25.96
    p-tert-butyltoluene 11.31
    methyl 4-tert-butylbenzoate 34.27
    morpholine 52.19
    tert-butylamine 3.64
    n-dodecanol 4.86
    dimethoxymethane 38.51
    ethylene carbonate 34.97
    cyrene 30.67
    2-ethoxyethyl acetate 36.15
    2-ethylhexyl acetate 29.26
    1,2,4-trichlorobenzene 63.11
    4-methylpyridine 65.52
    dibutyl ether 15.65
    2,6-dimethyl-4-heptanol 7.29
    DEF 49.35
    dimethyl isosorbide 52.82
    tetrachloroethylene 64.89
    eugenol 25.98
    triacetin 23.79
    span 80 20.11
    1,4-butanediol 1.9
    1,1-dichloroethane 50.03
    2-methyl-1-pentanol 9.32
    methyl formate 12.92
    2-methyl-1-butanol 9.86
    n-decane 2.63
    butyronitrile 12.84
    3,7-dimethyl-1-octanol 8.53
    1-chlorooctane 11.02
    1-chlorotetradecane 4.16
    n-nonane 2.3
    undecane 1.74
    tert-butylcyclohexane 3.0
    cyclooctane 2.69
    cyclopentanol 19.42
    tetrahydropyran 59.95
    tert-amyl methyl ether 20.61
    2,5,8-trioxanonane 26.57
    1-hexene 10.84
    2-isopropoxyethanol 10.04
    2,2,2-trifluoroethanol 5.46
    methyl butyrate 28.16

    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