Argon

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  • Identifiers

    CAS number
    7440-37-1

    Molecular formula
    Ar

    SMILES
    [Ar]

    Safety labels

    Compressed Gas
    Compressed Gas

  • Odor profile

  • Properties

    pKa est.
    -20.61 (strong acid)

    Molecular weight
    39.9 g/mol

    Melting point expt.

    • -186.36 °C triple point (69 kPa)
    • -189.4 °C
    • -189.2 °C

    Boiling point

    • -185.847 °C
    • -185.9 °C

    Flash point

    • -12.84 ˚C est.

    Solubility expt.

    • Soluble in organic liquids
    • Solubility of gas in water at 20 °C: 33.6 cu cm/kg water
    • Argon is two and one half times as soluble in water as nitrogen, having about the same solubility as oxygen.
    • Slightly soluble in water
    • Solubility in water, ml/100ml at 20 °C: 3.4

  • Synonyms

    • ARGON
    • 7440-37-1
    • Argon-40
    • Argon, Elemental
    • 67XQY1V3KH
    • Argon 40
    • AR
    • KHLADON R 740
    • INS NO.938
    • DTXSID3052482
    • E-938
    • INS-938
    • R 740
    • RefChem:113993
    • DTXCID0031055
    • 231-147-0
    • argon atom
    • Argon36
    • argon(0)
    • E938
    • Argon, >=99.998%
    • EINECS 231-147-0
    • UN1006
    • UN1951
    • UNII-67XQY1V3KH
    • Argon element
    • Atomic Argon
    • Element Argon
    • Element:Argon
    • Element-Ar
    • Element:Ar
    • Argon (element)
    • HSDB 7902
    • Argon (atomic)
    • Argon, compressed
    • Ar (element)
    • (~40~Ar)argon
    • (~36~Ar)Argon
    • (~41~Ar)Argon
    • ARGON [MART.]
    • ARGON [MI]
    • [Ar]
    • SCHEMBL2709
    • Argon, compressed [UN1006] [Nonflammable gas]
    • ARGON [EP MONOGRAPH]
    • CHEBI:49474
    • CHEBI:49475
    • DTXSID40931147
    • DTXSID90745913
    • DTXSID901382248
    • Argon, 99.999%, Messer(R) CANGas
    • Q696
    • E 938
    • NS00134265
    • Argon, refrigerated liquid (cryogenic liquid)
    • Argon, refrigerated liquid (cryogenic liquid) [UN1951] [Nonflammable gas]
    • 13994-72-4
    • 7440-37-1

  • Applications

    Argon (CAS 7440-37-1) is widely used as an inert shielding and purge gas across multiple industries. In arc welding and metal fabrication, it provides a protective atmosphere for MIG and TIG processes. In high-temperature annealing and heat treatment of reactive metals (such as titanium and stainless steel), Argon minimizes oxidation and contamination. The electronics and semiconductor sectors use Argon for plasma etching, chemical vapor deposition, and wafer processing under inert conditions. In glass, ceramics, and optics manufacturing, Argon helps prevent oxidation during melting and coating. It also serves as a fill gas in discharge lamps and other lighting applications. Additionally, Argon is used to create inert headspaces in food and beverage packaging to slow oxidation and extend shelf life.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 77.9
    methanol 115.42
    isopropanol 59.13
    water 13.99
    ethyl acetate 35.79
    n-propanol 53.92
    acetone 102.85
    n-butanol 45.61
    acetonitrile 63.12
    DMF 269.49
    toluene 15.94
    isobutanol 39.68
    1,4-dioxane 94.35
    methyl acetate 50.28
    THF 103.0
    2-butanone 53.01
    n-pentanol 33.43
    sec-butanol 46.84
    n-hexane 5.41
    ethylene glycol 59.28
    NMP 189.77
    cyclohexane 7.5
    DMSO 225.35
    n-butyl acetate 28.13
    n-octanol 25.45
    chloroform 48.43
    n-propyl acetate 25.35
    acetic acid 106.02
    dichloromethane 46.6
    cyclohexanone 66.39
    propylene glycol 40.5
    isopropyl acetate 23.37
    DMAc 179.15
    2-ethoxyethanol 64.35
    isopentanol 38.37
    n-heptane 6.27
    ethyl formate 32.75
    1,2-dichloroethane 38.74
    n-hexanol 34.03
    2-methoxyethanol 109.53
    isobutyl acetate 18.36
    tetrachloromethane 12.79
    n-pentyl acetate 23.28
    transcutol 150.57
    n-heptanol 22.13
    ethylbenzene 10.36
    MIBK 29.43
    2-propoxyethanol 63.7
    tert-butanol 72.31
    MTBE 45.5
    2-butoxyethanol 41.33
    propionic acid 54.93
    o-xylene 18.4
    formic acid 66.87
    diethyl ether 41.44
    m-xylene 14.84
    p-xylene 15.0
    chlorobenzene 24.38
    dimethyl carbonate 29.38
    n-octane 3.37
    formamide 77.1
    cyclopentanone 88.32
    2-pentanone 42.04
    anisole 31.19
    cyclopentyl methyl ether 45.54
    gamma-butyrolactone 97.49
    1-methoxy-2-propanol 75.24
    pyridine 49.51
    3-pentanone 35.55
    furfural 84.65
    n-dodecane 3.45
    diethylene glycol 74.73
    diisopropyl ether 14.95
    tert-amyl alcohol 52.99
    acetylacetone 52.33
    n-hexadecane 3.69
    acetophenone 32.59
    methyl propionate 39.27
    isopentyl acetate 26.89
    trichloroethylene 59.5
    n-nonanol 21.85
    cyclohexanol 40.42
    benzyl alcohol 28.85
    2-ethylhexanol 22.27
    isooctanol 18.6
    dipropyl ether 24.24
    1,2-dichlorobenzene 25.43
    ethyl lactate 22.03
    propylene carbonate 45.65
    n-methylformamide 88.16
    2-pentanol 33.0
    n-pentane 7.54
    1-propoxy-2-propanol 45.19
    1-methoxy-2-propyl acetate 34.01
    2-(2-methoxypropoxy) propanol 47.16
    mesitylene 12.29
    ε-caprolactone 52.47
    p-cymene 11.94
    epichlorohydrin 66.22
    1,1,1-trichloroethane 32.88
    2-aminoethanol 62.73
    morpholine-4-carbaldehyde 144.75
    sulfolane 124.66
    2,2,4-trimethylpentane 5.51
    2-methyltetrahydrofuran 65.02
    n-hexyl acetate 32.78
    isooctane 4.09
    2-(2-butoxyethoxy)ethanol 58.49
    sec-butyl acetate 17.65
    tert-butyl acetate 30.09
    decalin 5.08
    glycerin 65.83
    diglyme 101.22
    acrylic acid 61.08
    isopropyl myristate 16.22
    n-butyric acid 45.69
    acetyl acetate 29.57
    di(2-ethylhexyl) phthalate 18.51
    ethyl propionate 23.86
    nitromethane 131.84
    1,2-diethoxyethane 41.92
    benzonitrile 33.24
    trioctyl phosphate 15.2
    1-bromopropane 23.03
    gamma-valerolactone 101.23
    n-decanol 17.81
    triethyl phosphate 17.46
    4-methyl-2-pentanol 21.22
    propionitrile 37.45
    vinylene carbonate 42.72
    1,1,2-trichlorotrifluoroethane 67.86
    DMS 31.35
    cumene 9.78
    2-octanol 17.03
    2-hexanone 30.43
    octyl acetate 20.9
    limonene 18.59
    1,2-dimethoxyethane 86.72
    ethyl orthosilicate 17.03
    tributyl phosphate 17.19
    diacetone alcohol 46.72
    N,N-dimethylaniline 29.12
    acrylonitrile 51.39
    aniline 29.46
    1,3-propanediol 63.96
    bromobenzene 20.75
    dibromomethane 32.03
    1,1,2,2-tetrachloroethane 50.76
    2-methyl-cyclohexyl acetate 22.18
    tetrabutyl urea 25.8
    diisobutyl methanol 16.9
    2-phenylethanol 28.53
    styrene 13.73
    dioctyl adipate 23.85
    dimethyl sulfate 58.32
    ethyl butyrate 22.38
    methyl lactate 36.98
    butyl lactate 24.07
    diethyl carbonate 18.24
    propanediol butyl ether 46.68
    triethyl orthoformate 20.1
    p-tert-butyltoluene 12.45
    methyl 4-tert-butylbenzoate 35.47
    morpholine 93.45
    tert-butylamine 45.06
    n-dodecanol 14.95
    dimethoxymethane 84.17
    ethylene carbonate 34.12
    cyrene 44.96
    2-ethoxyethyl acetate 33.65
    2-ethylhexyl acetate 22.08
    1,2,4-trichlorobenzene 33.63
    4-methylpyridine 48.46
    dibutyl ether 23.05
    2,6-dimethyl-4-heptanol 16.9
    DEF 69.71
    dimethyl isosorbide 62.8
    tetrachloroethylene 38.36
    eugenol 38.37
    triacetin 37.89
    span 80 39.98
    1,4-butanediol 33.4
    1,1-dichloroethane 35.06
    2-methyl-1-pentanol 29.26
    methyl formate 66.24
    2-methyl-1-butanol 36.61
    n-decane 4.73
    butyronitrile 32.77
    3,7-dimethyl-1-octanol 22.35
    1-chlorooctane 14.03
    1-chlorotetradecane 7.65
    n-nonane 4.62
    undecane 3.92
    tert-butylcyclohexane 5.05
    cyclooctane 3.31
    cyclopentanol 49.19
    tetrahydropyran 57.6
    tert-amyl methyl ether 36.48
    2,5,8-trioxanonane 77.4
    1-hexene 14.15
    2-isopropoxyethanol 43.08
    2,2,2-trifluoroethanol 47.17
    methyl butyrate 30.8

    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