Sodium tetraborate pentahydrate

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  • Identifiers

    CAS number
    12179-04-3

    Molecular formula
    B4H10Na2O12

    SMILES
    B(=O)OB([O-])OB([O-])OB=O.O.O.O.O.O.[Na+].[Na+]

    Safety labels

    Health Hazard
    Health

  • Odor profile

    Fragrance
    Odorless 67.12%
    Clean 19.08%
    Fresh 18.83%
    Sweet 18.25%
    Alcoholic 16.34%
    Ethereal 15.68%
    Green 14.43%
    Savory 13.92%
    Sulfurous 12.42%
    Winey 11.67%

     

    Flavor
    Odorless 55.53%
    Bitter 40.39%
    Bland 27.47%
    Very mild 26.6%
    Mild 25.78%
    Sweet-like 20.95%
    Yeast 20.65%
    Formyl 18.9%
    Nitrile 18.37%
    Rotten 18.21%

     

  • Properties

    pKa est.
    8.28 (weak base)

    Molecular weight
    291.3 g/mol

    Melting point expt.

    • 392 °F

    Flash point

    • 40.27 ˚C est.

    Solubility expt.

    • 3%

  • Synonyms

    • Sodium borate, pentahydrate
    • SG2N20S03U
    • Boron sodium oxide(B4Na2O7), pentahydrate
    • Boric acid(H2B4O7), disodium salt, pentahydrate
    • RefChem:887925
    • 601-808-1
    • 12179-04-3
    • Boron sodium oxide (B4Na2O7), hydrate (1:5)
    • Disodium tetraborate pentahydrate
    • Sodium tetraborate pentahydrate
    • UNII-SG2N20S03U
    • Boron sodium oxide (B4Na2O7), pentahydrate
    • EC 215-540-4
    • Boric acid (H2B4O7), disodium salt, pentaborate
    • Boron sodium oxide pentahydrate
    • DTXSID7034389
    • QZSYXKPOZFXCDM-UHFFFAOYSA-N
    • NS00112432
    • 12179-04-3

  • Applications

    Sodium tetraborate pentahydrate (borax, CAS 12179-04-3) is widely used as a buffering and sequestering additive across several industries: in glass and ceramics as a flux to lower melting temperatures and improve workability; in household cleaning products and laundry detergents as a builder that softens water and stabilizes formulations; in cosmetics and personal care as a buffering agent and stabilizer to help maintain pH and suspension stability; in agriculture as a boron source fertilizer for crop nutrition; in polymers and adhesives as a crosslinking agent for borate-based systems (e.g., PVA) that imparts gel strength; and in metal finishing and electronics as a flux to remove oxide layers during soldering and brazing.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1236.75
    methanol 2139.89
    isopropanol 903.86
    water 579.75
    ethyl acetate 353.94
    n-propanol 872.81
    acetone 935.87
    n-butanol 648.16
    acetonitrile 626.14
    DMF 2872.3
    toluene 102.18
    isobutanol 489.5
    1,4-dioxane 739.84
    methyl acetate 430.68
    THF 1720.85
    2-butanone 539.47
    n-pentanol 480.1
    sec-butanol 570.9
    n-hexane 58.76
    ethylene glycol 1081.56
    NMP 1216.73
    cyclohexane 32.64
    DMSO 2064.23
    n-butyl acetate 196.48
    n-octanol 250.3
    chloroform 162.8
    n-propyl acetate 319.14
    acetic acid 511.1
    dichloromethane 233.6
    cyclohexanone 281.37
    propylene glycol 950.08
    isopropyl acetate 250.76
    DMAc 1497.15
    2-ethoxyethanol 1350.37
    isopentanol 417.09
    n-heptane 56.25
    ethyl formate 456.95
    1,2-dichloroethane 248.68
    n-hexanol 296.14
    2-methoxyethanol 2338.96
    isobutyl acetate 159.69
    tetrachloromethane 36.72
    n-pentyl acetate 170.32
    transcutol 1282.35
    n-heptanol 213.82
    ethylbenzene 75.71
    MIBK 294.26
    2-propoxyethanol 988.74
    tert-butanol 777.16
    MTBE 410.15
    2-butoxyethanol 526.69
    propionic acid 404.66
    o-xylene 85.9
    formic acid 786.58
    diethyl ether 635.69
    m-xylene 88.36
    p-xylene 72.32
    chlorobenzene 67.48
    dimethyl carbonate 486.39
    n-octane 28.6
    formamide 1257.59
    cyclopentanone 594.49
    2-pentanone 493.92
    anisole 297.35
    cyclopentyl methyl ether 532.27
    gamma-butyrolactone 744.59
    1-methoxy-2-propanol 1907.61
    pyridine 338.12
    3-pentanone 345.08
    furfural 587.84
    n-dodecane 28.49
    diethylene glycol 1150.6
    diisopropyl ether 175.61
    tert-amyl alcohol 466.22
    acetylacetone 403.21
    n-hexadecane 28.66
    acetophenone 219.0
    methyl propionate 496.0
    isopentyl acetate 130.02
    trichloroethylene 190.21
    n-nonanol 229.42
    cyclohexanol 276.36
    benzyl alcohol 287.25
    2-ethylhexanol 140.28
    isooctanol 142.74
    dipropyl ether 359.16
    1,2-dichlorobenzene 63.53
    ethyl lactate 372.18
    propylene carbonate 324.98
    n-methylformamide 1615.33
    2-pentanol 459.28
    n-pentane 87.94
    1-propoxy-2-propanol 647.2
    1-methoxy-2-propyl acetate 319.04
    2-(2-methoxypropoxy) propanol 456.98
    mesitylene 63.57
    ε-caprolactone 295.01
    p-cymene 56.92
    epichlorohydrin 707.72
    1,1,1-trichloroethane 96.34
    2-aminoethanol 1250.55
    morpholine-4-carbaldehyde 1134.07
    sulfolane 693.42
    2,2,4-trimethylpentane 26.08
    2-methyltetrahydrofuran 622.12
    n-hexyl acetate 208.43
    isooctane 25.16
    2-(2-butoxyethoxy)ethanol 630.87
    sec-butyl acetate 169.05
    tert-butyl acetate 260.67
    decalin 21.77
    glycerin 1203.02
    diglyme 846.18
    acrylic acid 416.79
    isopropyl myristate 120.13
    n-butyric acid 364.63
    acetyl acetate 159.97
    di(2-ethylhexyl) phthalate 117.24
    ethyl propionate 334.61
    nitromethane 978.36
    1,2-diethoxyethane 411.86
    benzonitrile 167.25
    trioctyl phosphate 104.28
    1-bromopropane 182.77
    gamma-valerolactone 752.78
    n-decanol 191.1
    triethyl phosphate 115.54
    4-methyl-2-pentanol 236.29
    propionitrile 495.93
    vinylene carbonate 284.25
    1,1,2-trichlorotrifluoroethane 435.79
    DMS 197.07
    cumene 63.13
    2-octanol 158.39
    2-hexanone 333.85
    octyl acetate 161.55
    limonene 72.4
    1,2-dimethoxyethane 1505.96
    ethyl orthosilicate 117.43
    tributyl phosphate 112.96
    diacetone alcohol 445.43
    N,N-dimethylaniline 289.15
    acrylonitrile 556.97
    aniline 233.65
    1,3-propanediol 1073.92
    bromobenzene 45.07
    dibromomethane 155.3
    1,1,2,2-tetrachloroethane 197.54
    2-methyl-cyclohexyl acetate 130.81
    tetrabutyl urea 204.13
    diisobutyl methanol 104.95
    2-phenylethanol 211.32
    styrene 86.64
    dioctyl adipate 175.1
    dimethyl sulfate 531.17
    ethyl butyrate 210.81
    methyl lactate 617.34
    butyl lactate 229.39
    diethyl carbonate 153.05
    propanediol butyl ether 533.72
    triethyl orthoformate 175.05
    p-tert-butyltoluene 62.86
    methyl 4-tert-butylbenzoate 244.47
    morpholine 1005.44
    tert-butylamine 456.19
    n-dodecanol 156.63
    dimethoxymethane 2219.43
    ethylene carbonate 264.13
    cyrene 451.1
    2-ethoxyethyl acetate 246.42
    2-ethylhexyl acetate 101.08
    1,2,4-trichlorobenzene 76.74
    4-methylpyridine 294.25
    dibutyl ether 212.42
    2,6-dimethyl-4-heptanol 104.95
    DEF 671.59
    dimethyl isosorbide 606.89
    tetrachloroethylene 127.16
    eugenol 347.22
    triacetin 209.46
    span 80 320.71
    1,4-butanediol 582.97
    1,1-dichloroethane 173.96
    2-methyl-1-pentanol 266.83
    methyl formate 1141.61
    2-methyl-1-butanol 387.87
    n-decane 39.05
    butyronitrile 410.23
    3,7-dimethyl-1-octanol 146.29
    1-chlorooctane 93.13
    1-chlorotetradecane 55.11
    n-nonane 37.2
    undecane 32.93
    tert-butylcyclohexane 26.05
    cyclooctane 21.94
    cyclopentanol 471.73
    tetrahydropyran 466.61
    tert-amyl methyl ether 350.73
    2,5,8-trioxanonane 711.45
    1-hexene 151.37
    2-isopropoxyethanol 772.99
    2,2,2-trifluoroethanol 323.19
    methyl butyrate 371.67

    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