Potassium Hydroxide

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  • Identifiers

    CAS number
    1310-58-3

    Molecular formula
    HKO

    SMILES
    [OH-].[K+]

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

  • Odor profile

    Odor impact est.
    Low

  • Properties

    pKa est.
    -1.37 (strong acid)

    Molecular weight
    56.106 g/mol

    Melting point expt.

    • 680 °F approximately (NTP, 1992)
    • 405
    • about 360 °C; about 380 °C when anhydrous
    • Melting point: 406 °C
    • 90-92% KOH; MP: about 250 °C; heat of fusion: about 6.7 kJ/mol /Technical potassium hydroxide/
    • 380 °C
    • 680 °F
    • 716 °F

    Boiling point

    • greater than 266 °F at 760 mmHg (USCG, 1999)
    • 2408 °F at 760 mmHg (NTP, 1992)
    • 1,320
    • 1327 °C
    • 1324 °C
    • 2408 °F
    • 2415 °F

    Flash point

    • 48.44 ˚C est.

    Solubility expt.

    • 107 g/100 cc at 59 °F (NTP, 1992)
    • Soluble
    • Very soluble in water. Freely soluble in ethanol
    • Solubility in water, 121 g/100 g water at 25 °C
    • Solubility in water (g KOH/100 g H2O): 97 at 0 °C; 103 at 10 °C; 112 at 20 °C; 126 at 30 °C; 178 at 100 °C
    • Soluble in 0.9 part water, about 0.6 part boiling water
    • Soluble in ethanol, methanol
    • For more Solubility (Complete) data for POTASSIUM HYDROXIDE (6 total), please visit the HSDB record page.
    • Solubility in water, g/100ml at 25 °C: 110 (very good)
    • (59 °F): 107%

  • Synonyms

    • POTASSIUM HYDROXIDE
    • 1310-58-3
    • Caustic potash
    • Potash lye
    • Potassium hydrate
    • Potassium hydroxide (K(OH))
    • Hydroxyde de potassium
    • Potassa
    • Potasse caustique
    • Caustic-potash
    • Kali causticum
    • Caswell No. 693
    • Cyantek CC 723
    • Kaliumhydroxid
    • CCRIS 6569
    • Potassio (idrossido di)
    • Potassium (hydroxyde de)
    • WZH3C48M4T
    • EPA Pesticide Chemical Code 075602
    • INS NO.525
    • INS-525
    • DTXSID5029633
    • E-525
    • CHEBI:32035
    • Kaliumhydroxyde
    • RefChem:6672
    • MIRACLE WATER 3 in 1
    • DTXCID209633
    • 215-181-3
    • potassium;hydroxide
    • MFCD00003553
    • potassiumhydroxide
    • Potassium hydroxide, pellets
    • Potassium hydroxide, flake
    • KOH
    • Potassium Hydroxide (~85%)
    • Potasse caustique [French]
    • Potassium hydroxide [JAN]
    • Potassium Hydroxide (Semiconductor Grade)
    • Hydroxyde de potassium [French]
    • HSDB 1234
    • Potassio (idrossido di) [Italian]
    • Potassium (hydroxyde de) [French]
    • EINECS 215-181-3
    • UN1813
    • UN1814
    • UNII-WZH3C48M4T
    • Base Number (BN) Standard: 6 mg KOH/g in Hydrocarbon Oil
    • Aetzkali
    • Kalilauge
    • Acid Number (AN) Standard: 0.1 mg KOH/g in Hydrocarbon Oil
    • Acid Number (AN) Standard: 0.5 mg KOH/g in Hydrocarbon Oil
    • Acid Number (AN) Standard: 1.0 mg KOH/g in Hydrocarbon Oil
    • Acid Number (AN) Standard: 1.5 mg KOH/g in Hydrocarbon Oil
    • Base Number (BN) Standard: 10 mg KOH/g in Hydrocarbon Oil
    • Base Number (BN) Standard: 15 mg KOH/g in Hydrocarbon Oil
    • Base Number (BN) Standard: 30 mg KOH/g in Hydrocarbon Oil
    • Base Number (BN) Standard: 40 mg KOH/g in Hydrocarbon Oil
    • Base Number (BN) Standard: 70 mg KOH/g in Hydrocarbon Oil
    • Potassium hydroxide [JAN:NF]
    • hydroxyl potassium
    • potasium hydroxide
    • potassium hydoxide
    • potassium hydroxid
    • potassium hyroxide
    • potassium hydorxide
    • Acid Number Standard 0.1 mgKOH/g. Reference materials intended for use in the determination of Acid
    • Acid Number Standard 0.5 mgKOH/g. Reference materials intended for use in the determination of Acid
    • Acid Number Standard 1 mgKOH/g. Reference materials intended for use in the determination of Acid Nu
    • Acid Number Standard 2 mgKOH/g. Reference materials intended for use in the determination of Acid Nu
    • Acid Number Standard 3 mgKOH/g. Reference materials intended for use in the determination of Acid Nu
    • Base Number Standard 10 mgKOH/g. Reference material intended for use in the determination of Base Nu
    • Base Number Standard 30 mgKOH/g. Reference materials intended for use in the determination of Base N
    • Base Number Standard 6 mgKOH/g. Reference materials intended for use in the determination of Base Nu
    • potassium -hydroxide
    • 11M Potassium hydroxide
    • 0.1M Potassium hydroxide
    • 0.5M Potassium hydroxide
    • Potassium hydroxide, solid
    • SCHEMBL135
    • Potassium hydroxide (KOH)
    • EC 215-181-3
    • Potassium Hydroxide, flakes
    • Potassium hydroxide anhydrous
    • Potassium Hydroxide (Powder)
    • KALI CAUSTICUM [HPUS]
    • Potassium Hydroxide (Pellets)
    • Potassium hydroxide on alumina
    • SCHEMBL6652818
    • CHEMBL2103983
    • POTASSIUM HYDROXIDE [II]
    • POTASSIUM HYDROXIDE [MI]
    • Potassium hydroxide (JP18/NF)
    • POTASSIUM HYDROXIDE [FCC]
    • Potassium Hydroxide, powder, ACS
    • POTASSIUM HYDROXIDE [HSDB]
    • Potassium hydroxide, p.a., 85%
    • POTASSIUM HYDROXIDE [VANDF]
    • POTASSIUM HYDROXIDE [MART.]
    • Potassium Hydroxide 50%w/w aq soln
    • 0.1M Potassium hydroxide, alcoholic
    • 0.5m Potassium Hydroxide, Alcoholic
    • POTASSIUM HYDROXIDE [WHO-DD]
    • Potassium hydroxide solution alcoholic
    • AKOS015904616
    • DB11153
    • FP34861
    • Potassium hydroxide, pellet, ACS reagent
    • POTASSIUM HYDROXIDE [EP MONOGRAPH]
    • Potassium hydroxide, pellets, ACS reagent
    • Potassium hydroxide in alcohol (10% v/v)
    • Potassium hydroxide, AR, flakes, >=85%
    • Potassium hydroxide, LR, flakes, >=85%
    • Potassium hydroxide, technical grade, 80%
    • Potassium hydroxide, AR, pellets, >=85%
    • Potassium hydroxide, LR, pellets, >=85%
    • NS00081389
    • P2844
    • P2849
    • D01168
    • Potassium hydroxide, technical, >=85%, lumps
    • Potassium hydroxide, technical, >=85%, powder
    • Potassium hydroxide, BioXtra, >=85% KOH basis
    • Potassium hydroxide, reagent grade, 90%, flakes
    • Potassium hydroxide, SAJ first grade, >=85.0%
    • Potassium hydroxide, tested according to Ph.Eur.
    • F044688
    • 1310-58-3

  • Applications

    Potassium Hydroxide (CAS 1310-58-3) is a caustic, strong base used across multiple industries: in soap and detergent manufacturing via saponification; as a base catalyst in biodiesel production (transesterification); for pH adjustment and neutralization in chemical processing and polymer production; in pulp and paper processing for causticizing and cleaning operations; in industrial cleaning formulations as a caustic builder and degreaser; and as an electrolyte component in alkaline batteries.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 146.31
    methanol 314.16
    isopropanol 106.52
    water 325.2
    ethyl acetate 17.09
    n-propanol 85.61
    acetone 76.03
    n-butanol 57.22
    acetonitrile 47.55
    DMF 682.56
    toluene 2.46
    isobutanol 52.02
    1,4-dioxane 72.04
    methyl acetate 33.54
    THF 72.57
    2-butanone 32.06
    n-pentanol 28.56
    sec-butanol 56.76
    n-hexane 1.43
    ethylene glycol 243.16
    NMP 181.13
    cyclohexane 2.02
    DMSO 355.37
    n-butyl acetate 7.58
    n-octanol 11.88
    chloroform 6.37
    n-propyl acetate 9.68
    acetic acid 166.51
    dichloromethane 10.5
    cyclohexanone 25.62
    propylene glycol 148.59
    isopropyl acetate 9.45
    DMAc 285.27
    2-ethoxyethanol 86.83
    isopentanol 37.76
    n-heptane 1.67
    ethyl formate 34.71
    1,2-dichloroethane 11.6
    n-hexanol 17.75
    2-methoxyethanol 212.21
    isobutyl acetate 4.94
    tetrachloromethane 2.35
    n-pentyl acetate 6.95
    transcutol 77.4
    n-heptanol 11.79
    ethylbenzene 1.65
    MIBK 11.69
    2-propoxyethanol 48.81
    tert-butanol 116.03
    MTBE 29.33
    2-butoxyethanol 30.22
    propionic acid 83.43
    o-xylene 3.87
    formic acid 288.34
    diethyl ether 21.05
    m-xylene 2.79
    p-xylene 2.21
    chlorobenzene 3.33
    dimethyl carbonate 30.6
    n-octane 0.75
    formamide 249.41
    cyclopentanone 41.1
    2-pentanone 20.8
    anisole 9.99
    cyclopentyl methyl ether 20.01
    gamma-butyrolactone 62.0
    1-methoxy-2-propanol 117.5
    pyridine 23.75
    3-pentanone 15.35
    furfural 58.53
    n-dodecane 0.77
    diethylene glycol 84.16
    diisopropyl ether 5.04
    tert-amyl alcohol 65.23
    acetylacetone 21.36
    n-hexadecane 0.78
    acetophenone 9.52
    methyl propionate 28.9
    isopentyl acetate 6.08
    trichloroethylene 12.1
    n-nonanol 9.94
    cyclohexanol 28.72
    benzyl alcohol 15.19
    2-ethylhexanol 7.28
    isooctanol 8.27
    dipropyl ether 8.74
    1,2-dichlorobenzene 3.75
    ethyl lactate 15.81
    propylene carbonate 23.06
    n-methylformamide 241.63
    2-pentanol 28.91
    n-pentane 2.69
    1-propoxy-2-propanol 29.29
    1-methoxy-2-propyl acetate 12.82
    2-(2-methoxypropoxy) propanol 26.85
    mesitylene 2.65
    ε-caprolactone 24.69
    p-cymene 2.29
    epichlorohydrin 40.79
    1,1,1-trichloroethane 4.45
    2-aminoethanol 212.07
    morpholine-4-carbaldehyde 170.82
    sulfolane 83.6
    2,2,4-trimethylpentane 1.73
    2-methyltetrahydrofuran 32.92
    n-hexyl acetate 9.78
    isooctane 1.22
    2-(2-butoxyethoxy)ethanol 36.31
    sec-butyl acetate 5.09
    tert-butyl acetate 10.92
    decalin 0.9
    glycerin 212.77
    diglyme 64.58
    acrylic acid 100.38
    isopropyl myristate 4.38
    n-butyric acid 47.75
    acetyl acetate 8.71
    di(2-ethylhexyl) phthalate 6.93
    ethyl propionate 10.05
    nitromethane 164.33
    1,2-diethoxyethane 13.84
    benzonitrile 9.83
    trioctyl phosphate 5.87
    1-bromopropane 5.33
    gamma-valerolactone 73.7
    n-decanol 7.82
    triethyl phosphate 5.71
    4-methyl-2-pentanol 14.14
    propionitrile 29.22
    vinylene carbonate 25.64
    1,1,2-trichlorotrifluoroethane 60.28
    DMS 10.77
    cumene 1.8
    2-octanol 7.42
    2-hexanone 10.18
    octyl acetate 6.84
    limonene 3.89
    1,2-dimethoxyethane 99.84
    ethyl orthosilicate 5.4
    tributyl phosphate 5.77
    diacetone alcohol 30.72
    N,N-dimethylaniline 11.83
    acrylonitrile 49.14
    aniline 13.92
    1,3-propanediol 152.86
    bromobenzene 1.79
    dibromomethane 5.31
    1,1,2,2-tetrachloroethane 11.81
    2-methyl-cyclohexyl acetate 5.4
    tetrabutyl urea 10.88
    diisobutyl methanol 5.3
    2-phenylethanol 9.81
    styrene 2.26
    dioctyl adipate 7.78
    dimethyl sulfate 55.72
    ethyl butyrate 7.16
    methyl lactate 46.25
    butyl lactate 11.27
    diethyl carbonate 5.57
    propanediol butyl ether 35.22
    triethyl orthoformate 6.86
    p-tert-butyltoluene 2.5
    methyl 4-tert-butylbenzoate 14.7
    morpholine 102.39
    tert-butylamine 50.48
    n-dodecanol 6.26
    dimethoxymethane 122.53
    ethylene carbonate 20.78
    cyrene 27.2
    2-ethoxyethyl acetate 11.33
    2-ethylhexyl acetate 4.46
    1,2,4-trichlorobenzene 4.73
    4-methylpyridine 19.63
    dibutyl ether 5.84
    2,6-dimethyl-4-heptanol 5.3
    DEF 62.4
    dimethyl isosorbide 25.49
    tetrachloroethylene 9.86
    eugenol 18.86
    triacetin 12.01
    span 80 22.18
    1,4-butanediol 67.36
    1,1-dichloroethane 7.2
    2-methyl-1-pentanol 18.48
    methyl formate 141.0
    2-methyl-1-butanol 35.71
    n-decane 1.04
    butyronitrile 22.86
    3,7-dimethyl-1-octanol 8.34
    1-chlorooctane 2.84
    1-chlorotetradecane 1.58
    n-nonane 0.99
    undecane 0.87
    tert-butylcyclohexane 0.97
    cyclooctane 0.85
    cyclopentanol 45.22
    tetrahydropyran 30.87
    tert-amyl methyl ether 20.7
    2,5,8-trioxanonane 47.75
    1-hexene 3.55
    2-isopropoxyethanol 39.18
    2,2,2-trifluoroethanol 79.99
    methyl butyrate 16.21

    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