Metaphosphoric Acid

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  • Identifiers

    CAS number
    37267-86-0

    Molecular formula
    HO3P

    SMILES
    OP(=O)=O

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 88.6%
    Sour 37.54%
    Sharp 26.09%
    Burnt 19.4%
    Pungent 17.4%
    Clean 14.94%
    Caramellic 14.04%
    Milky 11.72%
    Buttery 11.26%
    Cheesy 11.02%

     

    Flavor
    Odorless 64.93%
    Sour 40.4%
    Vinegar 37.91%
    Pungent 29.89%
    Sharp 27.63%
    Formyl 24.97%
    Mousy 21.02%
    Soy 20.75%
    Acidic 20.15%
    Bland 20.02%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    -1.2

    pKa est.
    4.91 (weak acid)

    Molecular weight
    79.98 g/mol

    Flash point

    • 117.74 ˚C est.

  • Synonyms

    • Metaphosphoric acid
    • 37267-86-0
    • Phosphenic acid
    • MTK99R3UV0
    • RefChem:156792
    • DTXSID301015564
    • 233-750-4
    • 253-433-4
    • meta-Phosphoric acid
    • 10343-62-1
    • hydrogenphosphonate
    • Metaphosphoric acid (HPO3)
    • UNII-MTK99R3UV0
    • Phosphoric acid meta
    • EINECS 253-433-4
    • MFCD00011351
    • HO3P
    • M phosphoric acid
    • phosphonate(1-)
    • hydrogen phosphonate
    • EINECS 233-750-4
    • hydrogen phosphonate ion
    • SCHEMBL4646
    • SCHEMBL22612672
    • SCHEMBL29532832
    • CHEBI:33462
    • DTXSID10893985
    • CHEBI:195297
    • UEZVMMHDMIWARA-UHFFFAOYSA-N
    • [PHO2(OH)](-)
    • hydridohydroxidodioxidophosphate(1-)
    • AKOS015893002
    • meta-Phosphoric acid, BioXtra, >=33.5%
    • meta-Phosphoric acid, 100%, lumps (glassy)
    • F988352
    • Q2622702
    • Q27115658
    • meta-Phosphoric acid, ACS reagent, chips, 33.5-36.5%
    • meta-Phosphoric acid, purum, ~65% HPO3 basis, pieces
    • Metaphosphoric acid, 39-43%, bal. NaPO3 (Stabilizer)
    • meta-Phosphoric acid, SAJ special grade, >=37.0% HPO3 basis
    • meta-Phosphoric acid, puriss. p.a., ACS reagent, >=33.5% (T)
    • 37267-86-0

  • Applications

    Metaphosphoric acid (CAS 37267-86-0) is used as an acidifying agent and pH-control component in cleaning formulations and industrial process baths, and as a source of phosphate for the synthesis of phosphate esters and polyphosphates in chemical processing. It also serves as a stabilizer and chelating agent in cooling water, water-treatment systems, and detergent formulations, helping to stabilize formulations and reduce metal precipitation. In addition, metaphosphoric acid can act as a source of phosphate groups for ceramic, glass, and coating chemistries, and is considered a mild acid catalyst or surface-treatment step in electronics manufacturing and metalworking.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 275.72
    methanol 427.6
    isopropanol 203.63
    water 505.73
    ethyl acetate 43.94
    n-propanol 165.58
    acetone 201.11
    n-butanol 118.38
    acetonitrile 104.68
    DMF 819.89
    toluene 19.2
    isobutanol 100.57
    1,4-dioxane 179.98
    methyl acetate 74.26
    THF 237.1
    2-butanone 83.14
    n-pentanol 84.09
    sec-butanol 114.4
    n-hexane 13.32
    ethylene glycol 263.67
    NMP 316.5
    cyclohexane 14.65
    DMSO 814.23
    n-butyl acetate 31.11
    n-octanol 41.62
    chloroform 22.19
    n-propyl acetate 36.16
    acetic acid 133.68
    dichloromethane 42.26
    cyclohexanone 70.68
    propylene glycol 163.65
    isopropyl acetate 30.87
    DMAc 424.28
    2-ethoxyethanol 214.44
    isopentanol 84.3
    n-heptane 12.2
    ethyl formate 75.79
    1,2-dichloroethane 51.35
    n-hexanol 57.81
    2-methoxyethanol 397.25
    isobutyl acetate 18.32
    tetrachloromethane 8.41
    n-pentyl acetate 31.44
    transcutol 171.99
    n-heptanol 44.42
    ethylbenzene 12.13
    MIBK 40.39
    2-propoxyethanol 146.96
    tert-butanol 190.34
    MTBE 69.53
    2-butoxyethanol 101.99
    propionic acid 90.7
    o-xylene 20.65
    formic acid 235.91
    diethyl ether 87.47
    m-xylene 16.69
    p-xylene 14.42
    chlorobenzene 12.18
    dimethyl carbonate 75.11
    n-octane 6.09
    formamide 360.11
    cyclopentanone 112.88
    2-pentanone 65.31
    anisole 40.63
    cyclopentyl methyl ether 79.91
    gamma-butyrolactone 121.48
    1-methoxy-2-propanol 252.54
    pyridine 71.5
    3-pentanone 49.6
    furfural 131.07
    n-dodecane 4.8
    diethylene glycol 197.63
    diisopropyl ether 23.51
    tert-amyl alcohol 105.86
    acetylacetone 65.97
    n-hexadecane 5.04
    acetophenone 35.95
    methyl propionate 65.59
    isopentyl acetate 22.47
    trichloroethylene 35.1
    n-nonanol 37.32
    cyclohexanol 66.01
    benzyl alcohol 48.22
    2-ethylhexanol 26.34
    isooctanol 31.04
    dipropyl ether 46.83
    1,2-dichlorobenzene 12.19
    ethyl lactate 45.52
    propylene carbonate 50.61
    n-methylformamide 328.27
    2-pentanol 75.82
    n-pentane 19.63
    1-propoxy-2-propanol 97.03
    1-methoxy-2-propyl acetate 41.6
    2-(2-methoxypropoxy) propanol 75.18
    mesitylene 14.56
    ε-caprolactone 60.29
    p-cymene 10.48
    epichlorohydrin 121.01
    1,1,1-trichloroethane 17.3
    2-aminoethanol 269.5
    morpholine-4-carbaldehyde 285.68
    sulfolane 182.8
    2,2,4-trimethylpentane 5.86
    2-methyltetrahydrofuran 99.83
    n-hexyl acetate 34.38
    isooctane 5.04
    2-(2-butoxyethoxy)ethanol 101.41
    sec-butyl acetate 19.69
    tert-butyl acetate 33.21
    decalin 5.48
    glycerin 246.76
    diglyme 177.42
    acrylic acid 97.26
    isopropyl myristate 19.84
    n-butyric acid 66.83
    acetyl acetate 24.68
    di(2-ethylhexyl) phthalate 22.85
    ethyl propionate 35.58
    nitromethane 208.9
    1,2-diethoxyethane 59.91
    benzonitrile 29.36
    trioctyl phosphate 21.77
    1-bromopropane 29.45
    gamma-valerolactone 161.15
    n-decanol 31.04
    triethyl phosphate 21.36
    4-methyl-2-pentanol 39.83
    propionitrile 65.39
    vinylene carbonate 48.91
    1,1,2-trichlorotrifluoroethane 100.01
    DMS 29.75
    cumene 11.34
    2-octanol 31.9
    2-hexanone 43.06
    octyl acetate 26.84
    limonene 14.24
    1,2-dimethoxyethane 286.67
    ethyl orthosilicate 21.07
    tributyl phosphate 20.9
    diacetone alcohol 71.81
    N,N-dimethylaniline 48.84
    acrylonitrile 83.52
    aniline 48.28
    1,3-propanediol 219.81
    bromobenzene 8.19
    dibromomethane 27.98
    1,1,2,2-tetrachloroethane 37.7
    2-methyl-cyclohexyl acetate 21.31
    tetrabutyl urea 39.3
    diisobutyl methanol 20.9
    2-phenylethanol 35.74
    styrene 14.02
    dioctyl adipate 27.53
    dimethyl sulfate 118.61
    ethyl butyrate 27.85
    methyl lactate 89.14
    butyl lactate 39.26
    diethyl carbonate 22.48
    propanediol butyl ether 88.14
    triethyl orthoformate 27.23
    p-tert-butyltoluene 11.13
    methyl 4-tert-butylbenzoate 46.71
    morpholine 205.88
    tert-butylamine 109.03
    n-dodecanol 25.82
    dimethoxymethane 340.48
    ethylene carbonate 46.15
    cyrene 68.58
    2-ethoxyethyl acetate 39.87
    2-ethylhexyl acetate 18.03
    1,2,4-trichlorobenzene 14.12
    4-methylpyridine 63.74
    dibutyl ether 28.76
    2,6-dimethyl-4-heptanol 20.9
    DEF 127.71
    dimethyl isosorbide 81.61
    tetrachloroethylene 29.85
    eugenol 62.9
    triacetin 35.67
    span 80 58.98
    1,4-butanediol 123.6
    1,1-dichloroethane 30.07
    2-methyl-1-pentanol 51.37
    methyl formate 221.24
    2-methyl-1-butanol 74.98
    n-decane 6.51
    butyronitrile 55.6
    3,7-dimethyl-1-octanol 26.98
    1-chlorooctane 14.27
    1-chlorotetradecane 8.75
    n-nonane 6.62
    undecane 5.42
    tert-butylcyclohexane 5.07
    cyclooctane 7.34
    cyclopentanol 102.78
    tetrahydropyran 87.94
    tert-amyl methyl ether 53.62
    2,5,8-trioxanonane 140.18
    1-hexene 23.97
    2-isopropoxyethanol 119.25
    2,2,2-trifluoroethanol 90.51
    methyl butyrate 47.0

    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