Styrene Oxide

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  • Identifiers

    CAS number
    96-09-3

    Molecular formula
    C8H8O

    SMILES
    C1C(O1)C2=CC=CC=C2

    Safety labels

    Irritant
    Irritant

    Health Hazard
    Health

  • Odor profile

    Fragrance
    Floral 61.34%
    Rose 56.53%
    Sweet 51.96%
    Fruity 51.75%
    Green 43.93%
    Earthy 41.6%
    Honey 37.93%
    Almond 36.4%
    Hyacinth 33.38%
    Metallic 31.92%

     

    Flavor
    Sweet 70.36%
    Bitter 51.3%
    Floral 41.69%
    Woody 37.81%
    Green 34.38%
    Rose 32.07%
    Herbal 30.55%
    Balsam 28.72%
    Earthy 28.2%
    Naphthalic 25.93%

     

    Odor impact est.
    Medium

    Odor threshold

    • Odor detection in air, 0.063 ppm (purity not specified)
    • Odor recognition in air, 0.400 ppm (purity not specified)
    • Odor low 0.3093 mg/cu m; Odor high 1.9640 mg/cu m

  • Properties

    XLogP3-AA
    1.6

    pKa est.
    4.1 (weak acid)

    Molecular weight
    120.15 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Fast

    Melting point expt.

    • -35 °F (NTP, 1992)
    • -35.6 °C
    • -36.7 °C
    • -35 °F

    Boiling point

    • 381 °F at 760 mmHg (NTP, 1992)
    • 194.1 °C
    • 194 °C
    • 381 °F

    Flash point

    • 64.42 ˚C est.
    • 175 °F (NTP, 1992)
    • 76 °C
    • 165 °F (74 °C) (Open cup)
    • 76 °C c.c.
    • 175 °F

    Solubility expt.

    • less than 1 mg/mL at 67.1 °F (NTP, 1992)
    • Completely soluble in acetone, benzene, carbon tetrachloride, ethyl ether, heptane, methanol
    • 0.3% wt in water
    • Solubility in water, g/100ml at 25 °C: 0.3 (poor)

  • Synonyms

    • Styrene oxide
    • 2-Phenyloxirane
    • 96-09-3
    • Phenyloxirane
    • Phenylethylene oxide
    • 1,2-Epoxyethylbenzene
    • Epoxystyrene
    • Oxirane, phenyl-
    • Styrene epoxide
    • Styryl oxide
    • Phenethylene oxide
    • Styrene 7,8-oxide
    • (Epoxyethyl)benzene
    • 1-Phenyloxirane
    • Styreneoxide
    • Phenyl oxirane
    • STYRENE-7,8-OXIDE
    • Benzene, (epoxyethyl)-
    • Epoxyethylbenzene
    • oxirane, 2-phenyl-
    • 1-Phenyl-1,2-epoxyethane
    • 1,2-Epoxy-1-phenylethane
    • 2-phenyl-oxirane
    • Epoxyethyl benzene
    • Fenyloxiran
    • rac Styrene Oxide
    • NCI-C54977
    • alpha,beta-Epoxystyrene
    • Benzene, (1,2-epoxyethyl)-
    • CCRIS 1268
    • (+/-)-styrene oxide
    • HSDB 2646
    • NSC 637
    • UNII-9QH06NGT6O
    • EINECS 202-476-7
    • EP-182
    • .alpha.,.beta.-Epoxystyrene
    • BRN 0108582
    • DTXSID2021286
    • CHEBI:17907
    • AI3-18151
    • NSC-637
    • STYRENE 0XIDE
    • NSC-7582
    • (1,2-Epoxyethyl)benzene
    • 9QH06NGT6O
    • STYRENE OXIDE [HSDB]
    • (+-)-STYRENE OXIDE
    • (+/-)-PHENYLOXIRANE
    • DTXCID301286
    • NSC637
    • Ethane, 1,2-epoxy-1-phenyl-
    • NSC7582
    • EC 202-476-7
    • 5-17-01-00577 (Beilstein Handbook Reference)
    • STYRENE-7,8-OXIDE [IARC]
    • rac Styrene-d5 Oxide
    • WLN: T3OTJ BR
    • Fenyloxiran [Czech]
    • (R)-(+)-Styrene-d5 Oxide
    • STYRENE-7,8-OXIDE (IARC)
    • CAS-96-09-3
    • 25189-69-9
    • (S)-(-)-Styrene oxide
    • STYRENE OXIDE-D8, 97+ ATOM % D
    • styrene oxide, (R)-isomer
    • styrene oxide, (S)-isomer
    • styrene oxide, (+-)-isomer
    • 1Phenyloxirane
    • 2Phenyloxirane
    • Oxirane, phenyl
    • MFCD00064310
    • a,b-Epoxystyrene
    • 192506-02-8
    • 2-(phenyl)oxirane
    • racemic phenyloxirane
    • (+)-styrene oxide
    • MFCD00005121
    • phenyl-ethylene oxide
    • racemic styrene oxide
    • 1,2Epoxyethylbenzene
    • 1,2Epoxy1phenylethane
    • 1Phenyl1,2epoxyethane
    • Benzene, (epoxyethyl)
    • Styrene oxide, 97%
    • (rac) phenylethylenoxide
    • 1,2-epoxyethyl benzene
    • Styrene oxide, >=97%
    • Benzene, (1,2epoxyethyl)
    • (.+/-.)-Styrene oxide
    • (+-)-PHENYLOXIRANE
    • (+/-)-phenylethylene oxide
    • SCHEMBL21026
    • STYRENE OXIDE [INCI]
    • STYRENE 1',2'-OXIDE
    • (.+-.)-PHENYLOXIRANE
    • CHEMBL1605493
    • (.+-.)-STYRENE OXIDE
    • EP182
    • (+-)-PHENYLETHYLENE OXIDE
    • BCP14534
    • WDC60312
    • BENZENE, (1,2-EPOXYETHYL)
    • Tox21_202112
    • Tox21_300110
    • c0037
    • STL146352
    • (.+-.)-PHENYLETHYLENE OXIDE
    • AKOS000120666
    • AKOS016843291
    • AC-9510
    • AC-9511
    • FR27573
    • NCGC00091674-01
    • NCGC00091674-02
    • NCGC00091674-03
    • NCGC00253978-01
    • NCGC00259661-01
    • BP-21407
    • SY032955
    • SY033347
    • DB-004092
    • (S)-phenyloxirane; (S)-Phenylethylene oxide
    • E0013
    • NS00008575
    • EN300-20996
    • C02083
    • Q413262

  • Applications

    Styrene Oxide (CAS 96-09-3) is an epoxide primarily used as a chemical intermediate in the synthesis of epoxy resins and glycidyl ethers, supporting epoxy-based coatings, adhesives, and electronic encapsulation materials; it participates in ring-opening polymerizations to form polyols for polyurethane and to prepare monomers and additives for specialty polymers; as a precursor to glycidyl derivatives, it is employed in the manufacture of plastic materials, coatings and inks, and various resin systems used in industrial applications; depending on local regulations and formulation limits, Styrene Oxide is generally treated as a reactive intermediate within the epoxy resin and polymer supply chain.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 185.81
    methanol 160.88
    isopropanol 129.03
    water 1.08
    ethyl acetate 253.01
    n-propanol 152.44
    acetone 333.47
    n-butanol 130.69
    acetonitrile 304.93
    DMF 296.11
    toluene 114.83
    isobutanol 101.54
    1,4-dioxane 637.88
    methyl acetate 278.82
    THF 506.65
    2-butanone 253.05
    n-pentanol 110.19
    sec-butanol 103.09
    n-hexane 20.97
    ethylene glycol 66.65
    NMP 210.51
    cyclohexane 33.11
    DMSO 516.66
    n-butyl acetate 153.84
    n-octanol 61.11
    chloroform 811.73
    n-propyl acetate 203.47
    acetic acid 239.67
    dichloromethane 842.61
    cyclohexanone 308.48
    propylene glycol 63.6
    isopropyl acetate 145.46
    DMAc 193.33
    2-ethoxyethanol 223.48
    isopentanol 111.76
    n-heptane 23.13
    ethyl formate 165.31
    1,2-dichloroethane 519.31
    n-hexanol 113.06
    2-methoxyethanol 280.83
    isobutyl acetate 141.33
    tetrachloromethane 112.01
    n-pentyl acetate 94.66
    transcutol 724.19
    n-heptanol 60.4
    ethylbenzene 70.17
    MIBK 149.64
    2-propoxyethanol 216.33
    tert-butanol 143.27
    MTBE 142.46
    2-butoxyethanol 139.11
    propionic acid 184.4
    o-xylene 67.9
    formic acid 78.89
    diethyl ether 231.01
    m-xylene 73.77
    p-xylene 82.95
    chlorobenzene 179.79
    dimethyl carbonate 101.74
    n-octane 11.64
    formamide 152.4
    cyclopentanone 362.41
    2-pentanone 201.31
    anisole 185.98
    cyclopentyl methyl ether 183.49
    gamma-butyrolactone 416.79
    1-methoxy-2-propanol 195.03
    pyridine 404.45
    3-pentanone 155.78
    furfural 377.71
    n-dodecane 10.77
    diethylene glycol 192.43
    diisopropyl ether 65.15
    tert-amyl alcohol 106.88
    acetylacetone 262.11
    n-hexadecane 12.07
    acetophenone 157.31
    methyl propionate 179.95
    isopentyl acetate 129.73
    trichloroethylene 802.93
    n-nonanol 59.62
    cyclohexanol 106.58
    benzyl alcohol 126.08
    2-ethylhexanol 73.44
    isooctanol 58.72
    dipropyl ether 123.55
    1,2-dichlorobenzene 159.7
    ethyl lactate 84.89
    propylene carbonate 221.48
    n-methylformamide 182.97
    2-pentanol 88.26
    n-pentane 19.99
    1-propoxy-2-propanol 139.3
    1-methoxy-2-propyl acetate 156.38
    2-(2-methoxypropoxy) propanol 137.63
    mesitylene 53.92
    ε-caprolactone 273.17
    p-cymene 48.01
    epichlorohydrin 599.72
    1,1,1-trichloroethane 342.08
    2-aminoethanol 97.44
    morpholine-4-carbaldehyde 361.02
    sulfolane 387.62
    2,2,4-trimethylpentane 14.24
    2-methyltetrahydrofuran 304.55
    n-hexyl acetate 123.02
    isooctane 15.4
    2-(2-butoxyethoxy)ethanol 192.11
    sec-butyl acetate 125.55
    tert-butyl acetate 151.81
    decalin 22.27
    glycerin 106.33
    diglyme 427.76
    acrylic acid 176.01
    isopropyl myristate 60.51
    n-butyric acid 211.54
    acetyl acetate 172.82
    di(2-ethylhexyl) phthalate 51.01
    ethyl propionate 155.76
    nitromethane 505.05
    1,2-diethoxyethane 216.87
    benzonitrile 169.62
    trioctyl phosphate 38.82
    1-bromopropane 239.13
    gamma-valerolactone 469.53
    n-decanol 47.72
    triethyl phosphate 69.39
    4-methyl-2-pentanol 67.68
    propionitrile 218.21
    vinylene carbonate 223.8
    1,1,2-trichlorotrifluoroethane 332.22
    DMS 140.97
    cumene 53.56
    2-octanol 43.99
    2-hexanone 181.75
    octyl acetate 70.23
    limonene 59.53
    1,2-dimethoxyethane 401.54
    ethyl orthosilicate 62.84
    tributyl phosphate 46.72
    diacetone alcohol 168.48
    N,N-dimethylaniline 105.38
    acrylonitrile 281.24
    aniline 124.73
    1,3-propanediol 154.71
    bromobenzene 196.48
    dibromomethane 520.39
    1,1,2,2-tetrachloroethane 532.17
    2-methyl-cyclohexyl acetate 96.07
    tetrabutyl urea 60.62
    diisobutyl methanol 61.3
    2-phenylethanol 114.67
    styrene 96.01
    dioctyl adipate 82.32
    dimethyl sulfate 152.76
    ethyl butyrate 138.16
    methyl lactate 90.87
    butyl lactate 76.14
    diethyl carbonate 105.54
    propanediol butyl ether 107.97
    triethyl orthoformate 91.47
    p-tert-butyltoluene 45.19
    methyl 4-tert-butylbenzoate 119.37
    morpholine 499.74
    tert-butylamine 86.45
    n-dodecanol 38.67
    dimethoxymethane 246.87
    ethylene carbonate 189.66
    cyrene 118.02
    2-ethoxyethyl acetate 159.2
    2-ethylhexyl acetate 100.23
    1,2,4-trichlorobenzene 182.26
    4-methylpyridine 253.23
    dibutyl ether 95.29
    2,6-dimethyl-4-heptanol 61.3
    DEF 192.39
    dimethyl isosorbide 207.66
    tetrachloroethylene 349.26
    eugenol 120.89
    triacetin 144.97
    span 80 103.6
    1,4-butanediol 75.58
    1,1-dichloroethane 377.45
    2-methyl-1-pentanol 95.36
    methyl formate 158.29
    2-methyl-1-butanol 94.2
    n-decane 15.61
    butyronitrile 182.92
    3,7-dimethyl-1-octanol 71.24
    1-chlorooctane 56.38
    1-chlorotetradecane 27.07
    n-nonane 14.96
    undecane 12.58
    tert-butylcyclohexane 22.95
    cyclooctane 14.75
    cyclopentanol 124.86
    tetrahydropyran 380.45
    tert-amyl methyl ether 96.27
    2,5,8-trioxanonane 243.53
    1-hexene 74.63
    2-isopropoxyethanol 166.34
    2,2,2-trifluoroethanol 105.86
    methyl butyrate 202.92

    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