Sodium phosphite

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  • Identifiers

    CAS number
    13708-85-5

    Molecular formula
    Na2O3P+

    SMILES
    [O-]P(=O)=O.[Na+].[Na+]

    Safety labels

  • Odor profile

    Fragrance
    Odorless 88.67%
    Sour 29.02%
    Sharp 22.13%
    Burnt 18.14%
    Pungent 15.81%
    Caramellic 14.71%
    Clean 14.25%
    Buttery 12.24%
    Bitter 11.22%
    Milky 11.03%

     

    Flavor
    Odorless 64.28%
    Sour 37.6%
    Vinegar 31.13%
    Sharp 26.11%
    Formyl 24.42%
    Pungent 22.44%
    Mousy 21.61%
    Rotten 20.58%
    Soy 20.41%
    Urine 20.28%

     

    Odor impact est.
    High

  • Properties

    pKa est.
    -0.94 (strong acid)

    Molecular weight
    124.952 g/mol

    Flash point

    • 63.13 ˚C est.

  • Synonyms

    • Disodium phosphonate
    • 13708-85-5
    • Disodium phosphite
    • Phosphonic acid, disodium salt
    • Phosphonic acid, sodium salt (1:2)
    • Disodium hydrogen phosphite
    • SODIUM PHOSPHITE [MI]
    • X65D416703
    • DTXSID20889617
    • EINECS 237-249-1
    • PHOSPHONIC ACID SODIUM SALT (1:2)
    • BRUGGOLEN H10
    • RefChem:887810
    • DTXCID101028870
    • Sodium phosphite
    • disodium oxophosphinate
    • Na2HPO3
    • SCHEMBL124360
    • IIRVGTWONXBBAW-UHFFFAOYSA-M
    • YPPQYORGOMWNMX-UHFFFAOYSA-L
    • UNII-X65D416703
    • SY122512
    • NS00085877
    • Q661724
    • 13708-85-5

  • Applications

    Sodium phosphite (CAS 13708-85-5) is used as a reducing agent and metal ion chelating agent in various industrial aqueous processes, including pretreatment baths and water-treatment formulations to control oxidation and scale formation. In polymers and plastics, it serves as a processing stabilizer and antioxidant, helping extend resin stability during melt processing and in end-use. In coatings and inks, it acts as a scavenger for trace metal ions and as a corrosion inhibitor to improve substrate compatibility and pigment stability. In cleaning formulations, it functions as a sequestering/builder to bind hardness ions and enhance formulation performance. It also serves as an intermediate in the synthesis of phosphite esters and other phosphorus-containing compounds used in chemical manufacturing.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 432.67
    methanol 648.32
    isopropanol 373.7
    water 225.09
    ethyl acetate 97.65
    n-propanol 281.22
    acetone 318.81
    n-butanol 247.27
    acetonitrile 183.43
    DMF 925.41
    toluene 41.3
    isobutanol 180.73
    1,4-dioxane 222.18
    methyl acetate 123.07
    THF 401.07
    2-butanone 166.66
    n-pentanol 158.81
    sec-butanol 251.78
    n-hexane 34.03
    ethylene glycol 316.89
    NMP 346.95
    cyclohexane 35.56
    DMSO 984.52
    n-butyl acetate 54.17
    n-octanol 97.38
    chloroform 85.62
    n-propyl acetate 65.69
    acetic acid 176.71
    dichloromethane 120.77
    cyclohexanone 113.42
    propylene glycol 211.45
    isopropyl acetate 71.9
    DMAc 489.56
    2-ethoxyethanol 286.37
    isopentanol 172.25
    n-heptane 30.62
    ethyl formate 108.98
    1,2-dichloroethane 126.17
    n-hexanol 124.59
    2-methoxyethanol 582.04
    isobutyl acetate 34.79
    tetrachloromethane 33.68
    n-pentyl acetate 61.23
    transcutol 229.87
    n-heptanol 92.37
    ethylbenzene 27.23
    MIBK 97.79
    2-propoxyethanol 231.0
    tert-butanol 409.73
    MTBE 208.57
    2-butoxyethanol 149.28
    propionic acid 125.47
    o-xylene 43.06
    formic acid 261.07
    diethyl ether 234.66
    m-xylene 39.27
    p-xylene 29.9
    chlorobenzene 31.37
    dimethyl carbonate 102.63
    n-octane 17.95
    formamide 395.84
    cyclopentanone 174.47
    2-pentanone 160.23
    anisole 72.68
    cyclopentyl methyl ether 159.79
    gamma-butyrolactone 166.16
    1-methoxy-2-propanol 388.4
    pyridine 110.64
    3-pentanone 109.17
    furfural 159.19
    n-dodecane 14.83
    diethylene glycol 272.44
    diisopropyl ether 75.19
    tert-amyl alcohol 276.51
    acetylacetone 116.11
    n-hexadecane 15.36
    acetophenone 59.45
    methyl propionate 121.06
    isopentyl acetate 44.06
    trichloroethylene 98.26
    n-nonanol 85.25
    cyclohexanol 142.29
    benzyl alcohol 78.05
    2-ethylhexanol 59.92
    isooctanol 66.51
    dipropyl ether 92.71
    1,2-dichlorobenzene 32.61
    ethyl lactate 66.31
    propylene carbonate 72.82
    n-methylformamide 375.71
    2-pentanol 196.32
    n-pentane 63.87
    1-propoxy-2-propanol 152.58
    1-methoxy-2-propyl acetate 69.08
    2-(2-methoxypropoxy) propanol 107.18
    mesitylene 32.36
    ε-caprolactone 88.51
    p-cymene 25.49
    epichlorohydrin 191.99
    1,1,1-trichloroethane 60.03
    2-aminoethanol 324.18
    morpholine-4-carbaldehyde 295.86
    sulfolane 247.75
    2,2,4-trimethylpentane 21.75
    2-methyltetrahydrofuran 206.04
    n-hexyl acetate 71.81
    isooctane 19.07
    2-(2-butoxyethoxy)ethanol 149.42
    sec-butyl acetate 41.03
    tert-butyl acetate 83.82
    decalin 12.95
    glycerin 307.96
    diglyme 223.95
    acrylic acid 119.79
    isopropyl myristate 41.84
    n-butyric acid 119.62
    acetyl acetate 45.91
    di(2-ethylhexyl) phthalate 37.15
    ethyl propionate 64.54
    nitromethane 256.65
    1,2-diethoxyethane 101.08
    benzonitrile 50.85
    trioctyl phosphate 37.16
    1-bromopropane 94.37
    gamma-valerolactone 194.05
    n-decanol 69.3
    triethyl phosphate 34.0
    4-methyl-2-pentanol 99.34
    propionitrile 125.55
    vinylene carbonate 65.54
    1,1,2-trichlorotrifluoroethane 155.87
    DMS 48.01
    cumene 24.18
    2-octanol 76.4
    2-hexanone 84.87
    octyl acetate 54.49
    limonene 38.1
    1,2-dimethoxyethane 346.95
    ethyl orthosilicate 35.52
    tributyl phosphate 34.97
    diacetone alcohol 151.7
    N,N-dimethylaniline 79.79
    acrylonitrile 137.78
    aniline 83.96
    1,3-propanediol 323.33
    bromobenzene 24.43
    dibromomethane 98.4
    1,1,2,2-tetrachloroethane 104.91
    2-methyl-cyclohexyl acetate 37.86
    tetrabutyl urea 61.66
    diisobutyl methanol 49.59
    2-phenylethanol 66.38
    styrene 29.42
    dioctyl adipate 47.96
    dimethyl sulfate 167.76
    ethyl butyrate 47.41
    methyl lactate 127.98
    butyl lactate 58.76
    diethyl carbonate 33.15
    propanediol butyl ether 128.02
    triethyl orthoformate 41.72
    p-tert-butyltoluene 28.93
    methyl 4-tert-butylbenzoate 80.03
    morpholine 278.11
    tert-butylamine 251.95
    n-dodecanol 56.73
    dimethoxymethane 471.58
    ethylene carbonate 59.97
    cyrene 91.53
    2-ethoxyethyl acetate 68.53
    2-ethylhexyl acetate 35.02
    1,2,4-trichlorobenzene 36.77
    4-methylpyridine 103.94
    dibutyl ether 65.47
    2,6-dimethyl-4-heptanol 49.59
    DEF 210.98
    dimethyl isosorbide 119.37
    tetrachloroethylene 85.59
    eugenol 93.94
    triacetin 56.0
    span 80 91.97
    1,4-butanediol 155.34
    1,1-dichloroethane 95.67
    2-methyl-1-pentanol 108.3
    methyl formate 252.92
    2-methyl-1-butanol 156.76
    n-decane 21.14
    butyronitrile 118.48
    3,7-dimethyl-1-octanol 65.78
    1-chlorooctane 44.7
    1-chlorotetradecane 24.14
    n-nonane 21.31
    undecane 17.34
    tert-butylcyclohexane 13.98
    cyclooctane 17.77
    cyclopentanol 183.66
    tetrahydropyran 165.03
    tert-amyl methyl ether 167.77
    2,5,8-trioxanonane 175.49
    1-hexene 64.47
    2-isopropoxyethanol 177.97
    2,2,2-trifluoroethanol 116.64
    methyl butyrate 79.41

    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