Tetraphenyl dimethyl disiloxane

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  • Identifiers

    CAS number
    807-28-3

    Molecular formula
    C26H26OSi2

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

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Floral 67.8%
    Rose 51.52%
    Green 50.5%
    Fruity 43.09%
    Balsamic 35.22%
    Fresh 30.3%
    Geranium 28.77%
    Metallic 28.52%
    Sweet 27.45%
    Earthy 27.2%

     

    Flavor
    Green 36.78%
    Bitter 32.48%
    Fruity 28.48%
    Rose 25.94%
    Floral 24.88%
    Waxy 20.84%
    Earthy 19.24%
    Balsam 19.2%
    Moth ball 18.78%
    Naphthelene 18.72%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    7.05 (neutral)

    Molecular weight
    410.7 g/mol

    Flash point

    • 195.92 ˚C est.

  • Synonyms

    • 807-28-3
    • 1,1,3,3-Tetraphenyl-1,3-dimethyldisiloxane
    • Disiloxane, 1,3-dimethyl-1,1,3,3-tetraphenyl-
    • 1,3-DIMETHYL-1,1,3,3-TETRAPHENYLDISILOXANE
    • Tetraphenyl dimethyl disiloxane
    • EINECS 212-361-3
    • 1,1,3,3-TETRAPHENYLDIMETHYLDISILOXANE
    • 54A20TN089
    • DTXSID7061144
    • T 2078
    • RefChem:897393
    • DTXCID0048181
    • 1,1,3,3Tetraphenyl1,3dimethyldisiloxane
    • 1,3Dimethyl1,1,3,3tetraphenyldisiloxane
    • TETRAPHENYL DIMETHYL DISILOXANE [INCI]
    • 212-361-3
    • Disiloxane,1,3-dimethyl-1,1,3,3-tetraphenyl-
    • methyl-[methyl(diphenyl)silyl]oxy-diphenylsilane
    • MFCD00053660
    • 1,3-dimethyl-1,1,3,3-tetraphenyl-disiloxane
    • C26H26OSi2
    • UNII-54A20TN089
    • methyldiphenylsilyl ether
    • methyl-[methyl(diphenyl)silyl]oxy-diphenyl-silane
    • SCHEMBL433139
    • NS00042283
    • G77688
    • 1,3-Dimethyl-1,1,3,3-tetraphenyldisiloxane #
    • Q27261202
    • 807-28-3

  • Applications

    Tetraphenyl dimethyl disiloxane (CAS 807-28-3) is primarily used as an organosilicon intermediate and a specialty polymer precursor. In practice, it is used as a crosslinking or end-capping agent for silicone elastomers and high-temperature polymers, enabling network formation and functionalizing siloxane chains. It also serves as a processing aid or high-boiling component in silicone coatings and inks, improving rheology and dispersion. In electronics and electrical insulation, it may serve as a thermally stable silicone component for encapsulants or potting compounds. It may be evaluated as an additive in coatings and adhesives to enhance moisture resistance and surface properties. All uses are subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 15.92
    methanol 6.66
    isopropanol 11.56
    water 0.03
    ethyl acetate 59.81
    n-propanol 23.41
    acetone 58.59
    n-butanol 23.51
    acetonitrile 18.59
    DMF 172.47
    toluene 76.77
    isobutanol 17.78
    1,4-dioxane 129.22
    methyl acetate 52.23
    THF 560.56
    2-butanone 89.47
    n-pentanol 21.98
    sec-butanol 20.22
    n-hexane 13.59
    ethylene glycol 1.68
    NMP 334.7
    cyclohexane 29.65
    DMSO 72.17
    n-butyl acetate 78.2
    n-octanol 23.61
    chloroform 433.73
    n-propyl acetate 52.63
    acetic acid 20.77
    dichloromethane 414.13
    cyclohexanone 211.71
    propylene glycol 4.6
    isopropyl acetate 50.97
    DMAc 207.52
    2-ethoxyethanol 29.27
    isopentanol 20.28
    n-heptane 21.94
    ethyl formate 39.47
    1,2-dichloroethane 212.84
    n-hexanol 33.47
    2-methoxyethanol 32.83
    isobutyl acetate 46.87
    tetrachloromethane 43.46
    n-pentyl acetate 79.99
    transcutol 59.39
    n-heptanol 27.91
    ethylbenzene 43.69
    MIBK 54.76
    2-propoxyethanol 54.38
    tert-butanol 14.79
    MTBE 44.21
    2-butoxyethanol 45.88
    propionic acid 25.2
    o-xylene 41.95
    formic acid 4.44
    diethyl ether 68.72
    m-xylene 39.97
    p-xylene 42.07
    chlorobenzene 133.59
    dimethyl carbonate 47.24
    n-octane 9.86
    formamide 13.26
    cyclopentanone 375.85
    2-pentanone 86.17
    anisole 69.67
    cyclopentyl methyl ether 171.37
    gamma-butyrolactone 314.18
    1-methoxy-2-propanol 32.76
    pyridine 198.59
    3-pentanone 87.16
    furfural 186.79
    n-dodecane 5.55
    diethylene glycol 15.35
    diisopropyl ether 24.62
    tert-amyl alcohol 22.82
    acetylacetone 82.76
    n-hexadecane 6.54
    acetophenone 74.34
    methyl propionate 71.96
    isopentyl acetate 72.79
    trichloroethylene 436.76
    n-nonanol 26.78
    cyclohexanol 37.23
    benzyl alcohol 38.77
    2-ethylhexanol 34.62
    isooctanol 25.05
    dipropyl ether 80.56
    1,2-dichlorobenzene 126.32
    ethyl lactate 22.99
    propylene carbonate 128.52
    n-methylformamide 43.52
    2-pentanol 18.72
    n-pentane 13.54
    1-propoxy-2-propanol 47.63
    1-methoxy-2-propyl acetate 80.89
    2-(2-methoxypropoxy) propanol 36.91
    mesitylene 24.8
    ε-caprolactone 162.63
    p-cymene 34.77
    epichlorohydrin 340.32
    1,1,1-trichloroethane 141.07
    2-aminoethanol 7.23
    morpholine-4-carbaldehyde 178.96
    sulfolane 307.24
    2,2,4-trimethylpentane 8.06
    2-methyltetrahydrofuran 218.83
    n-hexyl acetate 72.49
    isooctane 4.88
    2-(2-butoxyethoxy)ethanol 44.07
    sec-butyl acetate 43.96
    tert-butyl acetate 57.62
    decalin 14.39
    glycerin 6.6
    diglyme 99.11
    acrylic acid 22.71
    isopropyl myristate 33.39
    n-butyric acid 43.06
    acetyl acetate 38.41
    di(2-ethylhexyl) phthalate 30.67
    ethyl propionate 51.49
    nitromethane 55.68
    1,2-diethoxyethane 62.91
    benzonitrile 64.49
    trioctyl phosphate 23.67
    1-bromopropane 135.7
    gamma-valerolactone 312.46
    n-decanol 19.42
    triethyl phosphate 38.19
    4-methyl-2-pentanol 14.58
    propionitrile 33.12
    vinylene carbonate 114.03
    1,1,2-trichlorotrifluoroethane 123.08
    DMS 58.83
    cumene 27.97
    2-octanol 22.09
    2-hexanone 67.38
    octyl acetate 40.03
    limonene 52.28
    1,2-dimethoxyethane 86.59
    ethyl orthosilicate 38.77
    tributyl phosphate 27.07
    diacetone alcohol 42.77
    N,N-dimethylaniline 57.86
    acrylonitrile 37.17
    aniline 52.56
    1,3-propanediol 10.86
    bromobenzene 160.85
    dibromomethane 269.7
    1,1,2,2-tetrachloroethane 326.34
    2-methyl-cyclohexyl acetate 67.86
    tetrabutyl urea 45.05
    diisobutyl methanol 22.01
    2-phenylethanol 48.9
    styrene 50.38
    dioctyl adipate 47.46
    dimethyl sulfate 83.77
    ethyl butyrate 71.36
    methyl lactate 25.99
    butyl lactate 45.82
    diethyl carbonate 42.96
    propanediol butyl ether 25.84
    triethyl orthoformate 59.13
    p-tert-butyltoluene 31.7
    methyl 4-tert-butylbenzoate 70.49
    morpholine 157.45
    tert-butylamine 11.78
    n-dodecanol 14.56
    dimethoxymethane 106.02
    ethylene carbonate 86.91
    cyrene 66.21
    2-ethoxyethyl acetate 87.37
    2-ethylhexyl acetate 72.79
    1,2,4-trichlorobenzene 141.11
    4-methylpyridine 151.42
    dibutyl ether 47.46
    2,6-dimethyl-4-heptanol 22.01
    DEF 119.01
    dimethyl isosorbide 115.37
    tetrachloroethylene 169.08
    eugenol 55.75
    triacetin 58.39
    span 80 40.74
    1,4-butanediol 5.7
    1,1-dichloroethane 135.67
    2-methyl-1-pentanol 23.56
    methyl formate 38.33
    2-methyl-1-butanol 24.02
    n-decane 10.93
    butyronitrile 39.98
    3,7-dimethyl-1-octanol 23.08
    1-chlorooctane 35.56
    1-chlorotetradecane 14.0
    n-nonane 10.21
    undecane 7.46
    tert-butylcyclohexane 11.58
    cyclooctane 13.36
    cyclopentanol 53.2
    tetrahydropyran 177.15
    tert-amyl methyl ether 52.74
    2,5,8-trioxanonane 60.52
    1-hexene 33.85
    2-isopropoxyethanol 26.17
    2,2,2-trifluoroethanol 12.46
    methyl butyrate 66.33

    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