Styrene

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  • Identifiers

    CAS number
    100-42-5

    Molecular formula
    C8H8

    SMILES
    C=CC1=CC=CC=C1

    Safety labels

    Flammable
    Flammable

    Irritant
    Irritant

    Health Hazard
    Health

    Retention indicies (RI)

    • DB5: 893.0
    • Carbowax: 1252.8

  • Odor profile

    Fragrance
    Sweet 79.72%
    Floral 59.37%
    Balsamic 53.68%
    Spicy 42.43%
    Bitter 42.11%
    Pungent 42.04%
    Almond 41.38%
    Cinnamon 39.04%
    Cherry 37.38%
    Powdery 37.16%

     

    Flavor
    Sweet 88.04%
    Balsam 61.29%
    Floral 55.26%
    Balsamic 42.68%
    Cinnamon 40.65%
    Anise 40.45%
    Plastic 35.13%
    Cherry 34.36%
    Spice 32.76%
    Honey 32.64%

     

    Odor impact est.
    High

    Odor threshold

    • Odor Threshold Low: 0.01 [mmHg]. Odor Threshold High: 1.9 [mmHg]. Detection odor threshold from AIHA (mean = 0.14 ppm)
    • Detection in water: 0.73 ppm; Chemically pure
    • Recognition in air: 0.047 ppm; Chemically pure
    • Odor Threshold Range: 0.15 to 25 ppm
    • Odor detection in air, 0.05 ppm (purity not specified)
    • For more Odor Threshold (Complete) data for Styrene (7 total), please visit the HSDB record page.

  • Properties

    XLogP3-AA
    2.9

    pKa est.
    7.55 (neutral)

    Molecular weight
    104.15 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra fast

    Melting point expt.

    • -24 to -23 °F (NTP, 1992)
    • -30.65 °C
    • Latent heat of fusion: 10.95 kJ/mole (at melting point); Latent heat of sublimation: 43.9 kJ/mole (25 °C); Heat of formation: 103.8 kJ/mole (25 °C); Ionization potential: 8.42 eV
    • -33 °C
    • -30.6 °C
    • -23 °F

    Boiling point

    • 293 to 295 °F at 760 mmHg (NTP, 1992)
    • 145.3 °C
    • 145.00 to 146.00 °C. @ 760.00 mm Hg
    • 145 °C
    • 293 °F

    Flash point

    • 28.56 ˚C est.
    • 88 °F (NTP, 1992)
    • The Guide from the Emergency Response Guidebook is for "Styrene monomer, stabilized." 34 °C
    • 32.0 °C (89.6 °F) - closed cup
    • 88 °F (31 °C) - closed cup
    • 34.4 °C (Tag closed cup); 36.7 °C (Tag open cup).
    • 31 °C c.c.
    • 88 °F

    Solubility expt.

    • less than 1 mg/mL at 66 °F (NTP, 1992)
    • In water, 300 mg/L at 25 °C
    • Insoluble in water
    • Soluble in ethanol, ether, and acetone; miscible with benzene; slightly soluble in carbon tetrachloride
    • Soluble in carbon disulfide, alcohol, ether, methanol, acetone
    • For more Solubility (Complete) data for Styrene (6 total), please visit the HSDB record page.
    • 0.31 mg/mL at 25 °C
    • Solubility in water, g/100ml at 20 °C: 0.03
    • 0.03%

  • Synonyms

    • STYRENE
    • Ethenylbenzene
    • 100-42-5
    • Vinylbenzene
    • Phenylethylene
    • Benzene, ethenyl-
    • Styrol
    • Cinnamene
    • Phenylethene
    • Styrolene
    • Styrene monomer
    • Phenethylene
    • Vinylbenzol
    • Vinyl benzene
    • Styropol SO
    • Styren
    • Styrole
    • Benzene, vinyl-
    • Ethylene, phenyl-
    • Vinylbenzen
    • Stirolo
    • Styreen
    • Cinnamenol
    • Cinnamol
    • Vinyl-benzene
    • Bulstren K-525-19
    • Annamene
    • NCI-C02200
    • FEMA No. 3233
    • FEMA Number 3234
    • Styrol [German]
    • CCRIS 564
    • NSC 62785
    • Cinnaminol
    • HSDB 171
    • EINECS 202-851-5
    • UNII-44LJ2U959V
    • 25086-18-4
    • DTXSID2021284
    • CHEBI:27452
    • AI3-24374
    • MAOMIN SM
    • 44LJ2U959V
    • trans-Styrene-(beta)-d
    • MFCD00084450
    • NSC-62785
    • STYRENE-ALPHA-13C
    • DTXCID501284
    • Styrol (German)
    • EC 202-851-5
    • TTB 7302
    • MFCD00008612
    • Styrene-d5(StabilizedwithHydroquinone)
    • 12770-88-6
    • Diarex hf 77
    • NCGC00091056-01
    • STYRENE-ALPHA,2,3,4,5,6-D6
    • STYRENE (IARC)
    • STYRENE [IARC]
    • Styreen [Dutch]
    • Styren [Czech]
    • Styrene, analytical standard
    • Stirolo [Italian]
    • Vinylbenzen [Czech]
    • Vinylbenzen [Dutch]
    • 6911-81-5
    • Styron
    • Benzene, (1Z)-ethenyl-2-d-
    • Styrene 100 microg/mL in Methanol
    • styrene, monomer
    • Monomer, Styrene
    • MFCD00044231
    • Styrene (monomer)
    • CAS-100-42-5
    • COLESTYRAMINE IMPURITY A (EP IMPURITY)
    • COLESTYRAMINE IMPURITY A [EP IMPURITY]
    • Styrene (stabilized with 4-tert-Butylcatechol)
    • Vinylbenzene, inhibited
    • Phenylethylene, inhibited
    • UN2055
    • Styrene monomer, inhibited
    • ethenyl-benzene
    • phenyl-ethylene
    • p-vinyl benzene
    • SYN
    • Poly(Styrene-d8)
    • Styron (Salt/Mix)
    • Ethenylbenzene, 9CI
    • Styropol (Salt/Mix)
    • Styropor (Salt/Mix)
    • PhCH=CH2
    • STYRENE [HSDB]
    • Styrene, >=99%
    • STYRENE [MI]
    • Diarex hf 77 (Salt/Mix)
    • UN 2055 (Salt/Mix)
    • WLN: 1U1R
    • BIDD:ER0247
    • Styrene - stabilised with TBC
    • CHEMBL285235
    • Polystyrene, M.W. 50,000
    • CBA73242
    • NSC62785
    • Styrene, ReagentPlus(R), 99.9%
    • Tox21_113245
    • Tox21_200808
    • STL283958
    • Styrene 2000 microg/mL in Methanol
    • Styrene 5000 microg/mL in Methanol
    • Styrene; Phenylethylene; Vinylbenzene
    • AKOS000119972
    • FS27884
    • Styrene, SAJ first grade, >=99.0%
    • NCGC00091056-02
    • NCGC00091056-03
    • NCGC00091056-04
    • NCGC00091056-05
    • NCGC00258362-01
    • BP-13451
    • FP171383
    • SY061549
    • Styrene Solution 0.0001 Wt% in Toluene
    • DB-244813
    • NS00010820
    • S0651
    • EN300-19671
    • C07083
    • C19506

  • Applications

    Styrene (CAS 100-42-5) is primarily used as a monomer to produce polystyrene and a range of polymers such as ABS, SAN, and styrene-butadiene rubber (SBR), underpinning packaging plastics, electronic enclosures, and automotive components. It also serves as a key feedstock for copolymers and specialty plastics. In unsaturated polyester resins used for fiberglass-reinforced composites, it acts as a reactive diluent and processing solvent to control viscosity and crosslinking. Additionally, it is employed as a solvent and diluent in coatings, paints, and adhesive formulations. Polystyrene foam produced from styrene provides insulation and protective packaging in a variety of sectors.

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 648.2
    methanol 371.08
    isopropanol 632.84
    water 0.23
    ethyl acetate 2103.28
    n-propanol 697.88
    acetone 1854.22
    n-butanol 778.4
    acetonitrile 1714.65
    DMF 1371.18
    toluene 1126.28
    isobutanol 562.04
    1,4-dioxane 3429.83
    methyl acetate 1666.34
    THF 2754.1
    2-butanone 1879.04
    n-pentanol 580.24
    sec-butanol 701.96
    n-hexane 776.55
    ethylene glycol 70.5
    NMP 1462.16
    cyclohexane 731.21
    DMSO 1642.66
    n-butyl acetate 2597.82
    n-octanol 437.0
    chloroform 3030.56
    n-propyl acetate 1500.04
    acetic acid 501.62
    dichloromethane 3056.93
    cyclohexanone 2304.45
    propylene glycol 122.46
    isopropyl acetate 1113.32
    DMAc 894.83
    2-ethoxyethanol 615.7
    isopentanol 679.0
    n-heptane 608.73
    ethyl formate 825.98
    1,2-dichloroethane 2317.75
    n-hexanol 1027.21
    2-methoxyethanol 744.5
    isobutyl acetate 912.17
    tetrachloromethane 776.34
    n-pentyl acetate 787.91
    transcutol 2288.72
    n-heptanol 399.15
    ethylbenzene 667.64
    MIBK 950.73
    2-propoxyethanol 1126.57
    tert-butanol 888.95
    MTBE 1638.4
    2-butoxyethanol 536.53
    propionic acid 651.69
    o-xylene 549.9
    formic acid 61.37
    diethyl ether 2594.63
    m-xylene 636.98
    p-xylene 702.27
    chlorobenzene 1206.09
    dimethyl carbonate 533.5
    n-octane 201.47
    formamide 152.89
    cyclopentanone 2215.36
    2-pentanone 1651.33
    anisole 1176.88
    cyclopentyl methyl ether 1741.66
    gamma-butyrolactone 2110.71
    1-methoxy-2-propanol 733.19
    pyridine 1998.43
    3-pentanone 1428.94
    furfural 1315.97
    n-dodecane 130.58
    diethylene glycol 418.84
    diisopropyl ether 799.08
    tert-amyl alcohol 774.41
    acetylacetone 1355.33
    n-hexadecane 150.33
    acetophenone 807.62
    methyl propionate 1304.55
    isopentyl acetate 1566.88
    trichloroethylene 2978.39
    n-nonanol 379.12
    cyclohexanol 795.85
    benzyl alcohol 451.51
    2-ethylhexanol 848.63
    isooctanol 355.84
    dipropyl ether 2178.47
    1,2-dichlorobenzene 932.04
    ethyl lactate 348.51
    propylene carbonate 1222.61
    n-methylformamide 523.3
    2-pentanol 677.98
    n-pentane 472.3
    1-propoxy-2-propanol 1061.56
    1-methoxy-2-propyl acetate 1204.33
    2-(2-methoxypropoxy) propanol 568.2
    mesitylene 430.12
    ε-caprolactone 1892.0
    p-cymene 392.51
    epichlorohydrin 2412.91
    1,1,1-trichloroethane 2431.94
    2-aminoethanol 172.41
    morpholine-4-carbaldehyde 1613.29
    sulfolane 2179.19
    2,2,4-trimethylpentane 180.05
    2-methyltetrahydrofuran 2687.84
    n-hexyl acetate 1006.09
    isooctane 189.43
    2-(2-butoxyethoxy)ethanol 774.32
    sec-butyl acetate 950.4
    tert-butyl acetate 1150.42
    decalin 326.81
    glycerin 153.17
    diglyme 1629.62
    acrylic acid 407.92
    isopropyl myristate 494.34
    n-butyric acid 1129.54
    acetyl acetate 1004.68
    di(2-ethylhexyl) phthalate 262.2
    ethyl propionate 1306.41
    nitromethane 1268.95
    1,2-diethoxyethane 1980.37
    benzonitrile 812.58
    trioctyl phosphate 232.4
    1-bromopropane 2057.01
    gamma-valerolactone 2058.23
    n-decanol 310.27
    triethyl phosphate 398.71
    4-methyl-2-pentanol 409.26
    propionitrile 1359.4
    vinylene carbonate 1019.56
    1,1,2-trichlorotrifluoroethane 897.6
    DMS 751.66
    cumene 393.82
    2-octanol 324.52
    2-hexanone 1433.66
    octyl acetate 550.37
    limonene 659.58
    1,2-dimethoxyethane 1805.81
    ethyl orthosilicate 405.84
    tributyl phosphate 309.76
    diacetone alcohol 818.87
    N,N-dimethylaniline 655.89
    acrylonitrile 1210.85
    aniline 714.22
    1,3-propanediol 326.48
    bromobenzene 1535.33
    dibromomethane 2446.39
    1,1,2,2-tetrachloroethane 2292.75
    2-methyl-cyclohexyl acetate 811.87
    tetrabutyl urea 426.49
    diisobutyl methanol 486.05
    2-phenylethanol 653.88
    styrene 901.09
    dioctyl adipate 550.0
    dimethyl sulfate 707.94
    ethyl butyrate 1783.31
    methyl lactate 337.13
    butyl lactate 375.66
    diethyl carbonate 922.06
    propanediol butyl ether 353.38
    triethyl orthoformate 859.17
    p-tert-butyltoluene 359.35
    methyl 4-tert-butylbenzoate 559.39
    morpholine 2630.95
    tert-butylamine 673.38
    n-dodecanol 271.87
    dimethoxymethane 1270.97
    ethylene carbonate 1005.31
    cyrene 450.01
    2-ethoxyethyl acetate 847.87
    2-ethylhexyl acetate 1370.46
    1,2,4-trichlorobenzene 972.88
    4-methylpyridine 1943.13
    dibutyl ether 1325.53
    2,6-dimethyl-4-heptanol 486.05
    DEF 1614.64
    dimethyl isosorbide 1141.63
    tetrachloroethylene 1444.95
    eugenol 489.64
    triacetin 660.48
    span 80 498.34
    1,4-butanediol 140.97
    1,1-dichloroethane 2345.89
    2-methyl-1-pentanol 530.9
    methyl formate 457.25
    2-methyl-1-butanol 640.56
    n-decane 212.77
    butyronitrile 1403.11
    3,7-dimethyl-1-octanol 510.1
    1-chlorooctane 593.22
    1-chlorotetradecane 257.87
    n-nonane 242.46
    undecane 162.03
    tert-butylcyclohexane 322.45
    cyclooctane 330.92
    cyclopentanol 704.93
    tetrahydropyran 3127.87
    tert-amyl methyl ether 1096.27
    2,5,8-trioxanonane 1027.17
    1-hexene 1556.57
    2-isopropoxyethanol 554.08
    2,2,2-trifluoroethanol 155.99
    methyl butyrate 1599.07

    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

Botanical

Name CAS Botanical Proportion
Lemon balm 4 ssp. altimissia 8014-71-9 Melissa officinalis L. ssp.altissima (Sibthr. et Smith) Arcang., Lamiaceae 0.1%
Melittis melissophyllum Melittis melissophylum L., ssp. albida Guss, fam. Lamiaceae (Labiatae) 0.01%
Hedychium coronarium flower (Japan) Hedychium coronarium Koenig, fam. Zingiberaceae 0.05%
Cassia, bark (China) 2 8007-80-5 Cinnamomum cassia Blume, fam. Lauraceae 0.01%
Styrax (Honduras) 8024-01-9 Liquidambar styraciflua L., fam. Hamamelidaceae 1.8%
Hedyotis diffusa (Malaysia) Hedyotis diffusa Willd. (syn. Oldenlandia diffusa Roxb.), fam. Rubiaceae 0.6%
Sugandha kokila fruit Cinnamomum glaucescens (Nees) Drury (C. cecidodaphne Meissn.)fam.Lauraceae 0.1%
Cassia, bark (China) 5 8007-80-5 Cinnamomum cassia Blume, fam. Lauraceae 0.07%
Cassia, bark (China) 3b 8007-80-5 Cinnamomum cassia Blume, fam. Lauraceae 0.09%
Carob bean extract 1 9000-40-2 Ceratonia siliqua L., fam. Leguminoseae 0.2%
Decalepis hamiltonii root (India) Decalepis hamiltonii (Wight & Arn), fam. Asclepiadaceae 0.02%
Geneps fruit (Cuba) Melicocca bijuga L., fam. Sapindaceae 0.1%
Blepharocalyx tweediei (Argentina) 1a leaf Blepharocalyx tweediei (Hook. et Arn.) Berg, fam. Myrtaceae 0.2%
Blepharocalyx tweediei (Argentina) 1b seed Blepharocalyx tweediei (Hook. et Arn.) Berg, fam. Myrtaceae 0.1%
Cinnamon bark (Madagascar, Ecocert) 8007-80-5 Cinnamomum zeylanicum Blume (C. verum L. Presl), fam. Laureaceae 0.1%