hypophosphoric acid, tetrapotassium salt

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  • Identifiers

    CAS number
    99690-64-9

    Molecular formula
    K4O6P2

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

    Safety labels

  • Odor profile

    Fragrance
    Odorless 76.69%
    Sweet 25.48%
    Clean 15.31%
    Bitter 13.4%
    Savory 13.02%
    Balsamic 11.88%
    Sour 11.69%
    Burnt 11.64%
    Sharp 11.38%
    Cooling 10.82%

     

    Flavor
    Odorless 60.92%
    Bland 23.2%
    Very mild 22.9%
    Mild 20.73%
    Sour 19.12%
    Sweet-like 18.8%
    Mousy 18.59%
    Yeast 18.5%
    Rotten 18.06%
    Urine 18.03%

     

    Odor impact est.
    Medium

  • Properties

    pKa est.
    -4.03 (strong acid)

    Molecular weight
    314.34 g/mol

    Flash point

    • 146.25 ˚C est.

  • Synonyms

    • Tetrapotassium hypophosphate
    • Hypophosphoric acid, tetrapotassium salt
    • 99690-64-9
    • Potassium hypophosphate (K4P2O6)
    • DTXSID00244205
    • RefChem:789619
    • DTXCID60166696
    • Potassium hypophosphate
    • WT5R5F2EWH
    • Tetrapotassium hypodiphosphate
    • SCHEMBL1497930
    • 99690-64-9

  • Applications

    hypophosphoric acid, tetrapotassium salt (CAS 99690-64-9) is used primarily as a reducing agent in electroless nickel plating baths to deposit nickel-phosphorus coatings on metal parts in industrial manufacturing and electronics; it also serves as a complexing and stabilizing agent in surface finishing and cleaning formulations to control deposition and prevent corrosion. It may be used as a source of phosphorus and potassium in niche fertilizer formulations in agriculture, and as a chemical intermediate or reagent in various syntheses within chemical manufacturing and plastics formulations.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 36.4
    methanol 81.92
    isopropanol 20.8
    water 93.13
    ethyl acetate 9.67
    n-propanol 20.53
    acetone 26.27
    n-butanol 14.9
    acetonitrile 13.9
    DMF 173.92
    toluene 3.22
    isobutanol 9.98
    1,4-dioxane 26.16
    methyl acetate 13.25
    THF 31.72
    2-butanone 15.56
    n-pentanol 9.04
    sec-butanol 15.29
    n-hexane 2.21
    ethylene glycol 71.19
    NMP 128.47
    cyclohexane 8.22
    DMSO 360.94
    n-butyl acetate 6.96
    n-octanol 12.04
    chloroform 8.55
    n-propyl acetate 4.81
    acetic acid 25.37
    dichloromethane 12.84
    cyclohexanone 17.65
    propylene glycol 31.81
    isopropyl acetate 6.41
    DMAc 115.73
    2-ethoxyethanol 36.54
    isopentanol 8.78
    n-heptane 6.89
    ethyl formate 13.15
    1,2-dichloroethane 14.34
    n-hexanol 11.2
    2-methoxyethanol 84.61
    isobutyl acetate 1.8
    tetrachloromethane 3.83
    n-pentyl acetate 6.46
    transcutol 54.65
    n-heptanol 10.22
    ethylbenzene 2.09
    MIBK 5.39
    2-propoxyethanol 29.93
    tert-butanol 18.77
    MTBE 9.26
    2-butoxyethanol 19.99
    propionic acid 17.2
    o-xylene 4.91
    formic acid 82.36
    diethyl ether 15.76
    m-xylene 2.91
    p-xylene 2.08
    chlorobenzene 2.53
    dimethyl carbonate 14.83
    n-octane 3.41
    formamide 135.08
    cyclopentanone 23.62
    2-pentanone 11.76
    anisole 4.76
    cyclopentyl methyl ether 14.62
    gamma-butyrolactone 28.18
    1-methoxy-2-propanol 51.66
    pyridine 15.73
    3-pentanone 11.55
    furfural 29.86
    n-dodecane 2.23
    diethylene glycol 54.51
    diisopropyl ether 4.71
    tert-amyl alcohol 14.82
    acetylacetone 13.6
    n-hexadecane 2.37
    acetophenone 7.45
    methyl propionate 15.89
    isopentyl acetate 4.36
    trichloroethylene 11.07
    n-nonanol 10.67
    cyclohexanol 16.69
    benzyl alcohol 8.79
    2-ethylhexanol 6.67
    isooctanol 6.73
    dipropyl ether 10.81
    1,2-dichlorobenzene 3.02
    ethyl lactate 9.75
    propylene carbonate 10.52
    n-methylformamide 76.58
    2-pentanol 11.41
    n-pentane 5.8
    1-propoxy-2-propanol 23.85
    1-methoxy-2-propyl acetate 11.66
    2-(2-methoxypropoxy) propanol 18.59
    mesitylene 2.88
    ε-caprolactone 15.3
    p-cymene 4.23
    epichlorohydrin 19.91
    1,1,1-trichloroethane 3.49
    2-aminoethanol 51.64
    morpholine-4-carbaldehyde 80.95
    sulfolane 73.94
    2,2,4-trimethylpentane 1.48
    2-methyltetrahydrofuran 17.05
    n-hexyl acetate 7.58
    isooctane 0.99
    2-(2-butoxyethoxy)ethanol 25.99
    sec-butyl acetate 2.94
    tert-butyl acetate 6.06
    decalin 1.56
    glycerin 67.18
    diglyme 43.85
    acrylic acid 21.77
    isopropyl myristate 4.45
    n-butyric acid 13.0
    acetyl acetate 5.95
    di(2-ethylhexyl) phthalate 4.25
    ethyl propionate 5.76
    nitromethane 44.23
    1,2-diethoxyethane 13.61
    benzonitrile 5.88
    trioctyl phosphate 5.04
    1-bromopropane 7.0
    gamma-valerolactone 31.79
    n-decanol 8.58
    triethyl phosphate 5.67
    4-methyl-2-pentanol 5.27
    propionitrile 9.92
    vinylene carbonate 9.74
    1,1,2-trichlorotrifluoroethane 35.98
    DMS 8.26
    cumene 1.82
    2-octanol 7.71
    2-hexanone 5.66
    octyl acetate 5.91
    limonene 6.66
    1,2-dimethoxyethane 34.76
    ethyl orthosilicate 5.53
    tributyl phosphate 4.56
    diacetone alcohol 15.12
    N,N-dimethylaniline 8.51
    acrylonitrile 15.77
    aniline 9.42
    1,3-propanediol 42.07
    bromobenzene 1.93
    dibromomethane 9.68
    1,1,2,2-tetrachloroethane 14.16
    2-methyl-cyclohexyl acetate 4.51
    tetrabutyl urea 10.58
    diisobutyl methanol 6.22
    2-phenylethanol 9.19
    styrene 2.24
    dioctyl adipate 6.13
    dimethyl sulfate 34.29
    ethyl butyrate 6.64
    methyl lactate 28.59
    butyl lactate 10.06
    diethyl carbonate 4.7
    propanediol butyl ether 23.19
    triethyl orthoformate 6.9
    p-tert-butyltoluene 4.57
    methyl 4-tert-butylbenzoate 13.03
    morpholine 38.89
    tert-butylamine 12.42
    n-dodecanol 6.91
    dimethoxymethane 56.86
    ethylene carbonate 8.37
    cyrene 21.09
    2-ethoxyethyl acetate 9.14
    2-ethylhexyl acetate 3.69
    1,2,4-trichlorobenzene 3.83
    4-methylpyridine 10.07
    dibutyl ether 7.08
    2,6-dimethyl-4-heptanol 6.22
    DEF 32.52
    dimethyl isosorbide 24.34
    tetrachloroethylene 13.84
    eugenol 14.81
    triacetin 10.49
    span 80 16.76
    1,4-butanediol 21.16
    1,1-dichloroethane 5.28
    2-methyl-1-pentanol 5.47
    methyl formate 44.26
    2-methyl-1-butanol 9.02
    n-decane 3.57
    butyronitrile 8.3
    3,7-dimethyl-1-octanol 6.67
    1-chlorooctane 5.25
    1-chlorotetradecane 2.74
    n-nonane 3.74
    undecane 2.77
    tert-butylcyclohexane 1.0
    cyclooctane 4.64
    cyclopentanol 20.08
    tetrahydropyran 15.54
    tert-amyl methyl ether 9.98
    2,5,8-trioxanonane 35.58
    1-hexene 2.86
    2-isopropoxyethanol 18.0
    2,2,2-trifluoroethanol 25.52
    methyl butyrate 7.09

    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