Dimethylsilanediol

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  • Identifiers

    CAS number
    1066-42-8

    Molecular formula
    C2H8O2Si

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

    Safety labels

    Health Hazard
    Health

  • Odor profile

    Fragrance
    Odorless 53.53%
    Sweet 34.21%
    Alcoholic 28.27%
    Fresh 19.38%
    Sharp 18.47%
    Musty 18.21%
    Fruity 18.08%
    Fishy 17.7%
    Clean 17.65%
    Sour 17.59%

     

    Flavor
    Odorless 41.74%
    Bitter 34.99%
    Sweet 34.33%
    Pungent 30.28%
    Mild 22.94%
    Alcoholic 22.69%
    Musty 22.33%
    Very slight 22.14%
    Sweet-like 20.7%
    Fruit 20.32%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    11.12 (strong base)

    Molecular weight
    92.17 g/mol

    Flash point

    • 43.96 ˚C est.

  • Synonyms

    • DIMETHYLSILANEDIOL
    • 1066-42-8
    • Silanediol, dimethyl-
    • DNZ4KJE28U
    • Silanediol, 1,1-dimethyl-
    • DTXSID2061434
    • CHEBI:23816
    • RefChem:134378
    • DTXCID8033011
    • 213-915-7
    • dihydroxy(dimethyl)silane
    • 1,1-Dimethylsilanediol
    • Polydimethylsiloxane, hydroxy terminated, M.W. 4200
    • 31692-79-2
    • 1,1-Dimethylsilanediol >90%
    • Dihydroxydimethylsilane
    • C2H8O2Si
    • Dihydroxydimethylsilane; Dimethyldihydroxysilane; Dimethylsilanediol;
    • EINECS 213-915-7
    • Dimethylsilanediol #
    • Simethicone Impurity 10
    • Si(OH)2Me2
    • UNII-DNZ4KJE28U
    • SCHEMBL59794
    • SCHEMBL59795
    • (CH3)2Si(OH)2
    • SCHEMBL4389530
    • MFCD19441445
    • NS00042702
    • F71313
    • H58078
    • POLY(DIMETHYLSILOXANE) HYDROXY TERMINATED
    • Q1225753
    • 31692-79-2

  • Applications

    Dimethylsilanediol (CAS 1066-42-8) is primarily used as an intermediate in silicone polymer and specialty resin synthesis, acting as a silanol-functional building block for di- and polysiloxane networks. It serves as a surface-modifying reagent and coupling agent for silica, glass, and other inorganic surfaces to improve adhesion and compatibility in coatings and adhesives, and it functions as a crosslinking component in silicone coatings and elastomer formulations to promote Si–O–Si networking upon condensation. In electronics-related materials, it is used as a precursor for siloxane resins and encapsulants used in protective coatings and sealants, and it may be employed as a feedstock during the production of silicone polymers used in durable plastics and specialty resins, with formulation considerations for moisture sensitivity. Subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 869.54
    methanol 1522.77
    isopropanol 593.03
    water 1052.31
    ethyl acetate 72.99
    n-propanol 550.1
    acetone 369.7
    n-butanol 385.21
    acetonitrile 176.78
    DMF 610.94
    toluene 28.8
    isobutanol 298.91
    1,4-dioxane 275.26
    methyl acetate 101.8
    THF 517.9
    2-butanone 164.06
    n-pentanol 270.7
    sec-butanol 332.56
    n-hexane 57.02
    ethylene glycol 737.13
    NMP 275.34
    cyclohexane 52.55
    DMSO 463.11
    n-butyl acetate 71.69
    n-octanol 139.67
    chloroform 63.11
    n-propyl acetate 71.16
    acetic acid 389.61
    dichloromethane 56.72
    cyclohexanone 152.08
    propylene glycol 623.88
    isopropyl acetate 55.91
    DMAc 301.62
    2-ethoxyethanol 420.61
    isopentanol 208.71
    n-heptane 58.01
    ethyl formate 105.61
    1,2-dichloroethane 53.74
    n-hexanol 271.27
    2-methoxyethanol 757.88
    isobutyl acetate 47.22
    tetrachloromethane 32.74
    n-pentyl acetate 65.36
    transcutol 315.73
    n-heptanol 172.93
    ethylbenzene 18.27
    MIBK 78.27
    2-propoxyethanol 430.32
    tert-butanol 408.71
    MTBE 116.04
    2-butoxyethanol 268.89
    propionic acid 247.37
    o-xylene 23.61
    formic acid 550.16
    diethyl ether 177.06
    m-xylene 27.73
    p-xylene 23.1
    chlorobenzene 21.7
    dimethyl carbonate 71.39
    n-octane 20.38
    formamide 499.69
    cyclopentanone 237.77
    2-pentanone 132.51
    anisole 51.59
    cyclopentyl methyl ether 171.24
    gamma-butyrolactone 198.96
    1-methoxy-2-propanol 523.92
    pyridine 103.63
    3-pentanone 88.46
    furfural 158.58
    n-dodecane 11.69
    diethylene glycol 458.49
    diisopropyl ether 50.9
    tert-amyl alcohol 216.52
    acetylacetone 97.02
    n-hexadecane 11.78
    acetophenone 47.23
    methyl propionate 95.85
    isopentyl acetate 50.22
    trichloroethylene 55.77
    n-nonanol 113.05
    cyclohexanol 206.48
    benzyl alcohol 77.61
    2-ethylhexanol 95.25
    isooctanol 102.43
    dipropyl ether 137.06
    1,2-dichlorobenzene 18.12
    ethyl lactate 83.86
    propylene carbonate 85.03
    n-methylformamide 400.9
    2-pentanol 233.15
    n-pentane 73.12
    1-propoxy-2-propanol 279.48
    1-methoxy-2-propyl acetate 79.38
    2-(2-methoxypropoxy) propanol 118.69
    mesitylene 21.16
    ε-caprolactone 109.92
    p-cymene 21.46
    epichlorohydrin 141.55
    1,1,1-trichloroethane 34.3
    2-aminoethanol 855.55
    morpholine-4-carbaldehyde 290.73
    sulfolane 204.45
    2,2,4-trimethylpentane 16.08
    2-methyltetrahydrofuran 207.91
    n-hexyl acetate 79.9
    isooctane 16.65
    2-(2-butoxyethoxy)ethanol 203.45
    sec-butyl acetate 38.34
    tert-butyl acetate 58.27
    decalin 13.8
    glycerin 729.93
    diglyme 296.14
    acrylic acid 231.17
    isopropyl myristate 34.37
    n-butyric acid 187.0
    acetyl acetate 43.18
    di(2-ethylhexyl) phthalate 37.95
    ethyl propionate 59.19
    nitromethane 282.47
    1,2-diethoxyethane 96.03
    benzonitrile 42.48
    trioctyl phosphate 36.59
    1-bromopropane 49.55
    gamma-valerolactone 262.06
    n-decanol 80.68
    triethyl phosphate 32.96
    4-methyl-2-pentanol 104.4
    propionitrile 122.73
    vinylene carbonate 70.8
    1,1,2-trichlorotrifluoroethane 166.53
    DMS 43.68
    cumene 18.11
    2-octanol 102.27
    2-hexanone 99.95
    octyl acetate 51.11
    limonene 32.74
    1,2-dimethoxyethane 376.96
    ethyl orthosilicate 36.26
    tributyl phosphate 33.78
    diacetone alcohol 131.7
    N,N-dimethylaniline 54.73
    acrylonitrile 129.67
    aniline 79.4
    1,3-propanediol 608.8
    bromobenzene 13.63
    dibromomethane 49.93
    1,1,2,2-tetrachloroethane 62.22
    2-methyl-cyclohexyl acetate 45.49
    tetrabutyl urea 53.16
    diisobutyl methanol 53.84
    2-phenylethanol 81.83
    styrene 19.72
    dioctyl adipate 44.27
    dimethyl sulfate 86.24
    ethyl butyrate 53.55
    methyl lactate 141.23
    butyl lactate 82.14
    diethyl carbonate 35.73
    propanediol butyl ether 246.15
    triethyl orthoformate 52.49
    p-tert-butyltoluene 24.25
    methyl 4-tert-butylbenzoate 69.08
    morpholine 383.08
    tert-butylamine 273.28
    n-dodecanol 59.57
    dimethoxymethane 353.67
    ethylene carbonate 69.96
    cyrene 105.92
    2-ethoxyethyl acetate 67.53
    2-ethylhexyl acetate 41.19
    1,2,4-trichlorobenzene 22.88
    4-methylpyridine 74.1
    dibutyl ether 64.56
    2,6-dimethyl-4-heptanol 53.84
    DEF 130.49
    dimethyl isosorbide 130.87
    tetrachloroethylene 59.49
    eugenol 99.17
    triacetin 60.78
    span 80 132.92
    1,4-butanediol 328.93
    1,1-dichloroethane 48.96
    2-methyl-1-pentanol 126.18
    methyl formate 235.28
    2-methyl-1-butanol 202.63
    n-decane 20.06
    butyronitrile 111.23
    3,7-dimethyl-1-octanol 73.56
    1-chlorooctane 39.79
    1-chlorotetradecane 16.94
    n-nonane 21.14
    undecane 14.54
    tert-butylcyclohexane 14.72
    cyclooctane 22.29
    cyclopentanol 314.49
    tetrahydropyran 233.92
    tert-amyl methyl ether 83.7
    2,5,8-trioxanonane 203.62
    1-hexene 84.86
    2-isopropoxyethanol 240.53
    2,2,2-trifluoroethanol 181.57
    methyl butyrate 75.19

    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