Chlorine

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  • Identifiers

    CAS number
    7782-50-5

    Molecular formula
    Cl2

    SMILES
    ClCl

    Safety labels

    Oxidizer
    Oxidizer

    Compressed Gas
    Compressed Gas

    Acute Toxic
    Acute Toxic

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Fishy 51.24%
    Cheesy 41.31%
    Odorless 39.3%
    Alcoholic 37.85%
    Ripe 37.39%
    Fermented 35.26%
    Oily 33.85%
    Sweet 28.83%
    Solvent 26.6%
    Pungent 25.5%

     

    Flavor
    Fishy 34.05%
    Egg 29.66%
    Ammoniacal 27.88%
    Odorless 25.92%
    Rotten 24.59%
    Garlic 22.33%
    Sulfur 21.91%
    Decomposing cabbage 21.71%
    Ammonia 20.31%
    Mousy 19.52%

     

    Odor impact est.
    Low

    Odor threshold

    • Odor Threshold Low: 0.2 [ppm]. Odor Threshold High: 0.4 [ppm]. Mean detection odor threshold = 0.080 ppm. Odor threshold = 0.2 to 0.4 ppm
    • Water odor threshold: 0.0020 mg/L. Air odor threshold: 0.31 ppm. Odor Safety Class: C. C= Odor safety factor from 1-26. Less than 50% of distracted persons perceive warning of threshold limit value.
    • Low odor threshold= 0.0300 mg/cu m. High odor threshold= 15.0000 mg/cu m. Irritating concn= 9.00 mg/cu m.

  • Properties

    XLogP3-AA
    1.6

    pKa est.
    -16.88 (strong acid)

    Molecular weight
    70.9 g/mol

    Melting point expt.

    • -150 °F (EPA, 1998)
    • -101.5 °C
    • -101 °C
    • -150 °F

    Boiling point

    • -30.3 °F at 760 mmHg (EPA, 1998)
    • -34.04 °C
    • -34 °C
    • -29 °F

    Flash point

    • 2.65 ˚C est.

    Solubility expt.

    • 0.7 % (NIOSH, 2024)
    • 1.46 g/100 cc water at 0 °C; 310 cc/100 cc water at 10 °C; 177 cc/100 cc water at 30 °C; 0.57 g/100 cc water at 30 °C
    • Solubility in water at 25 °C with formation of aqueous Cl2 (0.062 M), HOCl (0.030 M), chloride ion (0.030 M); total solubility: 0.092 M; more soluble in alkalies
    • In water, 6,300 mg/L at 25 °C
    • Solubility in water, g/100ml at 20 °C: 0.7
    • 0.7%

  • Synonyms

    • CHLORINE
    • 7782-50-5
    • CL
    • Molecular chlorine
    • dichlorine
    • Bertholite
    • Chlorinum
    • Chloor
    • Chlore
    • Chlor
    • Cloro
    • Chlorine mol.
    • Caswell No. 179
    • Chlorine-elemental
    • Chlorine 35
    • CCRIS 2280
    • HSDB 206
    • UN 1017
    • EINECS 231-959-5
    • EPA Pesticide Chemical Code 020501
    • UNII-4R7X1O2820
    • CL2
    • INS NO.925
    • 81859-29-2
    • DTXSID1020273
    • CHEBI:29310
    • INS-925
    • EC 231-959-5
    • 4R7X1O2820
    • E-925
    • Chlore [French]
    • Cloro [Italian]
    • Chloor [Dutch]
    • Chlor [German]
    • Chlorine, puriss., >=99.8%
    • Chlorine mol
    • Liquid Chlorine
    • Bertholite /warfare gas/
    • UN1017
    • Chlorine - Cl @ 100 microg/g in 75 cSt Mineral Oil
    • Chlorine - Cl @ 1000 microg/g in 75 cSt Mineral Oil
    • Chlorine Blank - Cl @ 0 microg/g in 75 cSt Mineral Oil
    • chorine chloride
    • Total Chlorine
    • Chloroniumchlorid
    • HBA Disinfectant
    • Disinfectant(NaClO)
    • Caswell No 179
    • Bertholite/warfare gas/
    • CHLORINE [HSDB]
    • CHLORINE [FCC]
    • CHLORINE [MI]
    • CHLORINE [VANDF]
    • CHLORINUM [HPUS]
    • CHLORINE [WHO-DD]
    • Chlorine, >=99.5%
    • DTXCID50273
    • CHLORINE MOLECULE (CL2)
    • CHEBI:33432
    • Chlorine [UN1017] [Poison gas]
    • AKOS015915796
    • USEPA/OPP Pesticide Code: 20501
    • DB11109
    • D-150
    • NS00076171
    • Chlorine Blank (0 wt%) in 75 cSt Mineral Oil
    • Chlorine - Cl @ 5000 microg/g in 75 cSt Oil
    • Q1904422
    • Chlorine - Cl @ 1.00 wt% in 75 cSt Mineral Oil
    • Chlorine - Cl @ 10 microg/g in 75 cSt Mineral Oil
    • Chlorine - Cl @ 5 microg/g in 75 cSt Mineral Oil
    • Chlorine - Cl @ 50 microg/g in 75 cSt Mineral Oil
    • Chlorine - Cl @ 500 microg/g in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 20 microg/g in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 25 microg/g in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 50 microg/g in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 75 microg/g in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 10 microg/g (0.0010 wt%) in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 100 microg/g (0.0100 wt%) in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 1000 microg/g (0.100 wt%) in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 10000 microg/g (1.00 wt%) in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 200 microg/g (0.0200 wt%) in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 2000 microg/g (0.200 wt%) in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 250 microg/g (0.0250 wt%) in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 500 microg/g (0.0500 wt%) in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 50000 microg/g (5.00 wt%) in 75 cSt Mineral Oil
    • Chlorine Standard: Cl @ 750 microg/g (0.0750 wt%) in 75 cSt Mineral Oil
    • 231-959-5

  • Applications

    Chlorine serves as a versatile industrial chemical with applications across multiple sectors: water treatment and sanitation (disinfection of drinking water, process water, and effluents); production of chlorine-containing polymers, notably vinyl chloride monomer for PVC and other chlorinated plastics; pulp and paper bleaching using chlorine-based reagents; household and industrial cleaning and disinfection products such as bleach and hypochlorite formulations; chemical synthesis and intermediates, including chlorination steps to produce chlorinated organics and feedstocks like vinyl chloride; and surface treatment or etching in electronics and metals processing where chlorine-containing cleaners and etchants are used.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 149.46
    methanol 157.85
    isopropanol 128.33
    water 3.15
    ethyl acetate 184.03
    n-propanol 123.07
    acetone 399.08
    n-butanol 124.38
    acetonitrile 227.0
    DMF 687.85
    toluene 166.54
    isobutanol 99.06
    1,4-dioxane 379.05
    methyl acetate 202.31
    THF 462.91
    2-butanone 247.89
    n-pentanol 93.24
    sec-butanol 119.41
    n-hexane 66.62
    ethylene glycol 57.66
    NMP 660.6
    cyclohexane 127.91
    DMSO 600.32
    n-butyl acetate 176.08
    n-octanol 100.1
    chloroform 433.13
    n-propyl acetate 139.55
    acetic acid 241.46
    dichloromethane 369.37
    cyclohexanone 378.32
    propylene glycol 56.91
    isopropyl acetate 138.56
    DMAc 520.39
    2-ethoxyethanol 144.47
    isopentanol 114.56
    n-heptane 67.97
    ethyl formate 124.45
    1,2-dichloroethane 264.55
    n-hexanol 116.69
    2-methoxyethanol 232.43
    isobutyl acetate 97.24
    tetrachloromethane 157.25
    n-pentyl acetate 132.92
    transcutol 479.25
    n-heptanol 81.99
    ethylbenzene 94.4
    MIBK 146.04
    2-propoxyethanol 185.38
    tert-butanol 186.0
    MTBE 189.19
    2-butoxyethanol 132.02
    propionic acid 133.6
    o-xylene 133.81
    formic acid 68.34
    diethyl ether 213.04
    m-xylene 122.15
    p-xylene 139.39
    chlorobenzene 204.55
    dimethyl carbonate 129.02
    n-octane 34.41
    formamide 111.12
    cyclopentanone 442.43
    2-pentanone 222.22
    anisole 183.98
    cyclopentyl methyl ether 256.62
    gamma-butyrolactone 399.77
    1-methoxy-2-propanol 198.09
    pyridine 324.24
    3-pentanone 201.91
    furfural 366.16
    n-dodecane 26.79
    diethylene glycol 156.35
    diisopropyl ether 94.65
    tert-amyl alcohol 147.05
    acetylacetone 290.45
    n-hexadecane 30.25
    acetophenone 193.69
    methyl propionate 173.74
    isopentyl acetate 148.43
    trichloroethylene 478.66
    n-nonanol 88.56
    cyclohexanol 170.13
    benzyl alcohol 122.76
    2-ethylhexanol 96.24
    isooctanol 70.85
    dipropyl ether 162.25
    1,2-dichlorobenzene 200.02
    ethyl lactate 73.11
    propylene carbonate 210.32
    n-methylformamide 182.37
    2-pentanol 107.09
    n-pentane 70.35
    1-propoxy-2-propanol 165.09
    1-methoxy-2-propyl acetate 165.91
    2-(2-methoxypropoxy) propanol 153.92
    mesitylene 101.82
    ε-caprolactone 266.99
    p-cymene 87.24
    epichlorohydrin 315.0
    1,1,1-trichloroethane 341.33
    2-aminoethanol 79.3
    morpholine-4-carbaldehyde 476.48
    sulfolane 536.77
    2,2,4-trimethylpentane 41.22
    2-methyltetrahydrofuran 333.4
    n-hexyl acetate 168.53
    isooctane 33.08
    2-(2-butoxyethoxy)ethanol 189.31
    sec-butyl acetate 99.07
    tert-butyl acetate 170.66
    decalin 55.37
    glycerin 93.33
    diglyme 388.87
    acrylic acid 150.57
    isopropyl myristate 86.33
    n-butyric acid 157.39
    acetyl acetate 166.96
    di(2-ethylhexyl) phthalate 78.16
    ethyl propionate 128.77
    nitromethane 359.99
    1,2-diethoxyethane 223.92
    benzonitrile 186.46
    trioctyl phosphate 63.85
    1-bromopropane 180.87
    gamma-valerolactone 415.03
    n-decanol 70.53
    triethyl phosphate 88.73
    4-methyl-2-pentanol 71.41
    propionitrile 150.29
    vinylene carbonate 195.86
    1,1,2-trichlorotrifluoroethane 281.41
    DMS 163.68
    cumene 74.19
    2-octanol 72.92
    2-hexanone 160.16
    octyl acetate 104.16
    limonene 132.45
    1,2-dimethoxyethane 318.5
    ethyl orthosilicate 87.83
    tributyl phosphate 75.67
    diacetone alcohol 183.14
    N,N-dimethylaniline 167.09
    acrylonitrile 191.92
    aniline 152.31
    1,3-propanediol 107.58
    bromobenzene 230.63
    dibromomethane 287.41
    1,1,2,2-tetrachloroethane 384.4
    2-methyl-cyclohexyl acetate 117.46
    tetrabutyl urea 116.99
    diisobutyl methanol 80.88
    2-phenylethanol 123.68
    styrene 127.01
    dioctyl adipate 115.78
    dimethyl sulfate 237.59
    ethyl butyrate 145.05
    methyl lactate 102.47
    butyl lactate 98.32
    diethyl carbonate 108.1
    propanediol butyl ether 130.37
    triethyl orthoformate 114.99
    p-tert-butyltoluene 89.43
    methyl 4-tert-butylbenzoate 164.73
    morpholine 347.86
    tert-butylamine 139.1
    n-dodecanol 60.3
    dimethoxymethane 302.75
    ethylene carbonate 161.53
    cyrene 163.5
    2-ethoxyethyl acetate 169.77
    2-ethylhexyl acetate 132.65
    1,2,4-trichlorobenzene 233.26
    4-methylpyridine 315.4
    dibutyl ether 152.96
    2,6-dimethyl-4-heptanol 80.88
    DEF 321.7
    dimethyl isosorbide 271.15
    tetrachloroethylene 303.05
    eugenol 157.25
    triacetin 180.34
    span 80 151.19
    1,4-butanediol 55.02
    1,1-dichloroethane 276.81
    2-methyl-1-pentanol 87.4
    methyl formate 161.75
    2-methyl-1-butanol 107.41
    n-decane 40.59
    butyronitrile 147.58
    3,7-dimethyl-1-octanol 93.57
    1-chlorooctane 94.56
    1-chlorotetradecane 50.49
    n-nonane 43.35
    undecane 31.41
    tert-butylcyclohexane 49.96
    cyclooctane 53.68
    cyclopentanol 178.63
    tetrahydropyran 323.73
    tert-amyl methyl ether 163.21
    2,5,8-trioxanonane 283.14
    1-hexene 116.56
    2-isopropoxyethanol 115.05
    2,2,2-trifluoroethanol 102.61
    methyl butyrate 164.01

    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