Potassium Isostearate

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  • Identifiers

    CAS number
    66469-15-6

    Molecular formula
    C18H35KO2

    SMILES
    CC(C)CCCCCCCCCCCCCCC(=O)[O-].[K+]

    Safety labels

  • Odor profile

    Fragrance
    Waxy 75.73%
    Fatty 60.46%
    Oily 34.89%
    Odorless 34.5%
    Woody 24.29%
    Animal 22.4%
    Creamy 21.77%
    Savory 20.82%
    Milky 20.53%
    Fishy 19.3%

     

    Flavor
    Fatty 35.18%
    Waxy 34.92%
    Bland 32.73%
    Mild 32.71%
    Faint 29.16%
    Fat 28.23%
    Oily 26.1%
    Odorless 25.83%
    Slightly waxy 24.49%
    Delicate 22.97%

     

    Odor impact est.
    Low

  • Properties

    pKa est.
    5.13 (weak acid)

    Molecular weight
    322.6 g/mol

    Flash point

    • 167.8 ˚C est.

  • Synonyms

    • Potassium isostearate
    • Isooctadecanoic acid, potassium salt
    • EH37ZN9J0J
    • Isooctadecanoic acid, potassium salt (1:1)
    • 66469-15-6
    • RefChem:1096542
    • DTXSID6042070
    • 266-369-7
    • Potassium 16-methylheptadecanoate
    • 68413-46-7
    • 16-Methylheptadecanoic acid, potassium salt
    • Potassium isooctadecanoate
    • EINECS 266-369-7
    • EINECS 270-218-0
    • UNII-EH37ZN9J0J
    • Heptadecanoic acid, 16-methyl-, potassium salt
    • Heptadecanoic acid, 16-methyl-, potassium salt (1:1)
    • SCHEMBL29375385
    • DTXSID80892061
    • NGNZTXNWCGRXKL-UHFFFAOYSA-M
    • NS00091056
    • Q27893178
    • 68413-46-7

  • Applications

    Potassium Isostearate (CAS 66469-15-6) is the potassium salt of isostearic acid and is commonly used as an anionic surfactant and emulsifier in a range of formulations. In cosmetics and personal care, it acts as a mild cleansing surfactant and emollient-compatible emulsifier in cleansers, shampoos, and moisturizers. In household and industrial cleaning products, it serves as a wetting, foaming, and stabilizing agent that improves soil dispersion and rinseability. In coatings and inks, it functions as a surfactant and pigment dispersant, helping pigment dispersion and substrate wetting. In polymers and plastics processing, it can act as a processing aid or emulsifier to stabilize oil-in-water systems and assist dispersion. In industrial manufacturing more broadly, it provides emulsification and compatibility in various emulsions and concentrate formulations.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 81.07
    methanol 56.05
    isopropanol 117.02
    water 0.01
    ethyl acetate 262.52
    n-propanol 93.15
    acetone 166.06
    n-butanol 114.54
    acetonitrile 57.41
    DMF 257.16
    toluene 100.43
    isobutanol 100.35
    1,4-dioxane 271.41
    methyl acetate 134.58
    THF 933.82
    2-butanone 238.99
    n-pentanol 99.27
    sec-butanol 110.62
    n-hexane 47.07
    ethylene glycol 4.08
    NMP 542.86
    cyclohexane 121.64
    DMSO 364.55
    n-butyl acetate 375.34
    n-octanol 96.41
    chloroform 524.7
    n-propyl acetate 339.5
    acetic acid 63.68
    dichloromethane 504.05
    cyclohexanone 669.16
    propylene glycol 21.35
    isopropyl acetate 287.42
    DMAc 395.56
    2-ethoxyethanol 172.26
    isopentanol 157.2
    n-heptane 37.93
    ethyl formate 105.08
    1,2-dichloroethane 448.93
    n-hexanol 114.53
    2-methoxyethanol 190.79
    isobutyl acetate 259.9
    tetrachloromethane 125.72
    n-pentyl acetate 388.27
    transcutol 925.62
    n-heptanol 85.9
    ethylbenzene 93.28
    MIBK 302.28
    2-propoxyethanol 243.48
    tert-butanol 219.58
    MTBE 317.26
    2-butoxyethanol 211.92
    propionic acid 79.32
    o-xylene 98.35
    formic acid 9.71
    diethyl ether 192.12
    m-xylene 100.38
    p-xylene 131.27
    chlorobenzene 193.35
    dimethyl carbonate 46.35
    n-octane 18.55
    formamide 23.05
    cyclopentanone 692.71
    2-pentanone 290.06
    anisole 211.25
    cyclopentyl methyl ether 456.89
    gamma-butyrolactone 567.47
    1-methoxy-2-propanol 258.11
    pyridine 266.3
    3-pentanone 189.37
    furfural 396.9
    n-dodecane 10.56
    diethylene glycol 85.04
    diisopropyl ether 125.29
    tert-amyl alcohol 197.92
    acetylacetone 361.32
    n-hexadecane 13.08
    acetophenone 243.01
    methyl propionate 167.69
    isopentyl acetate 413.82
    trichloroethylene 668.6
    n-nonanol 98.45
    cyclohexanol 212.81
    benzyl alcohol 123.14
    2-ethylhexanol 128.53
    isooctanol 104.04
    dipropyl ether 252.63
    1,2-dichlorobenzene 250.21
    ethyl lactate 110.96
    propylene carbonate 340.94
    n-methylformamide 75.18
    2-pentanol 111.05
    n-pentane 25.06
    1-propoxy-2-propanol 279.3
    1-methoxy-2-propyl acetate 366.97
    2-(2-methoxypropoxy) propanol 240.39
    mesitylene 91.47
    ε-caprolactone 554.44
    p-cymene 88.84
    epichlorohydrin 671.17
    1,1,1-trichloroethane 490.28
    2-aminoethanol 24.89
    morpholine-4-carbaldehyde 420.4
    sulfolane 965.05
    2,2,4-trimethylpentane 29.46
    2-methyltetrahydrofuran 616.91
    n-hexyl acetate 396.16
    isooctane 23.5
    2-(2-butoxyethoxy)ethanol 320.55
    sec-butyl acetate 300.85
    tert-butyl acetate 441.08
    decalin 57.1
    glycerin 32.68
    diglyme 615.85
    acrylic acid 44.37
    isopropyl myristate 153.68
    n-butyric acid 230.75
    acetyl acetate 159.3
    di(2-ethylhexyl) phthalate 108.65
    ethyl propionate 263.96
    nitromethane 156.96
    1,2-diethoxyethane 425.04
    benzonitrile 156.88
    trioctyl phosphate 83.14
    1-bromopropane 278.28
    gamma-valerolactone 795.63
    n-decanol 66.81
    triethyl phosphate 157.53
    4-methyl-2-pentanol 100.42
    propionitrile 80.3
    vinylene carbonate 213.16
    1,1,2-trichlorotrifluoroethane 353.73
    DMS 182.39
    cumene 79.96
    2-octanol 85.81
    2-hexanone 303.82
    octyl acetate 166.71
    limonene 163.94
    1,2-dimethoxyethane 426.33
    ethyl orthosilicate 159.71
    tributyl phosphate 115.96
    diacetone alcohol 365.16
    N,N-dimethylaniline 156.62
    acrylonitrile 75.43
    aniline 109.33
    1,3-propanediol 61.58
    bromobenzene 235.8
    dibromomethane 366.33
    1,1,2,2-tetrachloroethane 724.89
    2-methyl-cyclohexyl acetate 321.19
    tetrabutyl urea 169.31
    diisobutyl methanol 110.15
    2-phenylethanol 137.1
    styrene 105.74
    dioctyl adipate 230.99
    dimethyl sulfate 133.61
    ethyl butyrate 331.41
    methyl lactate 79.49
    butyl lactate 236.86
    diethyl carbonate 165.44
    propanediol butyl ether 177.04
    triethyl orthoformate 266.49
    p-tert-butyltoluene 91.59
    methyl 4-tert-butylbenzoate 281.81
    morpholine 423.73
    tert-butylamine 154.16
    n-dodecanol 47.77
    dimethoxymethane 184.26
    ethylene carbonate 202.02
    cyrene 231.16
    2-ethoxyethyl acetate 376.73
    2-ethylhexyl acetate 344.32
    1,2,4-trichlorobenzene 301.55
    4-methylpyridine 294.01
    dibutyl ether 274.05
    2,6-dimethyl-4-heptanol 110.15
    DEF 312.81
    dimethyl isosorbide 552.49
    tetrachloroethylene 401.18
    eugenol 217.14
    triacetin 377.74
    span 80 234.83
    1,4-butanediol 26.36
    1,1-dichloroethane 371.9
    2-methyl-1-pentanol 122.64
    methyl formate 48.36
    2-methyl-1-butanol 121.55
    n-decane 25.0
    butyronitrile 136.75
    3,7-dimethyl-1-octanol 133.44
    1-chlorooctane 129.51
    1-chlorotetradecane 39.58
    n-nonane 24.87
    undecane 15.29
    tert-butylcyclohexane 49.51
    cyclooctane 34.38
    cyclopentanol 204.48
    tetrahydropyran 470.26
    tert-amyl methyl ether 264.63
    2,5,8-trioxanonane 397.93
    1-hexene 121.19
    2-isopropoxyethanol 178.22
    2,2,2-trifluoroethanol 29.14
    methyl butyrate 367.85

    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