Potassium Hydroxide



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K-OH-02 (2N) 99% Potassium Hydroxide Request
K-OH-025 (2N5) 99.5% Potassium Hydroxide Request
K-OH-03 (3N) 99.9% Potassium Hydroxide Request
K-OH-035 (3N5) 99.95% Potassium Hydroxide Request
K-OH-04 (4N) 99.99% Potassium Hydroxide Request
K-OH-05 (5N) 99.999% Potassium Hydroxide Request


Potassium Hydroxide is generally immediately available in most volumes. High purity, submicron and nanopowder forms may be considered. Hydroxide, the OH- anion composed of an oxygen atom bonded to a hydrogen atom, is commonly present in nature and is one of the most widely studied molecules in physical chemistry. Hydroxide compounds have diverse properties and uses, from base catalysis to detection of carbon dioxide. In a watershed 2013 experiment, scientists at JILA (the Joint Institute for Laboratory Astrophysics) achieved evaporative cooling of compounds for the first time using hydroxide molecules, a discovery that may lead to new methods of controlling chemical reactions and could impact a range of disciplines, including atmospheric science and energy production technologies. American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia)and follows applicable ASTM testing standards.Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.


Caustic potash, Potash lye, Potassium hydrate

Chemical Identifiers

Formula KOH
CAS 1310-58-3
Pubchem CID 14797
MDL MFCD00003553
EC No. 215-181-3
IUPAC Name potassium; hydroxide
Beilstein Registry No. N/A
InchI Identifier InChI=1S/K.H2O/h;1H2/q+1;/p-1


Compound Formula HKO
Molecular Weight 56.11
Appearance White to yellow crystalline solid
Melting Point 380-406 °C
Boiling Point 1327 °C
Density 2.04 g/cm3
Exact Mass 55.966446
Monoisotopic Mass 55.966446

Health & Safety Info  |  MSDS / SDS

Signal Word Danger
Hazard Statements H302-H314
Hazard Codes C
Risk Codes 22-35
Safety Statements 26-36/37/39-45
RTECS Number TT2100000
Transport Information UN 1813 8/PG 2
WGK Germany 1
Globally Harmonized System of Classification and Labelling (GHS) N/A

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Material Safety Data Sheet (MSDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes.

Related Products

KSee more Potassium products. Potassium (atomic symbol: K, atomic number: 19) is a Block S, Group 1, Period 4 element with an atomic weight of 39.0983. The number of electrons in each of Potassium's shells is [2, 8, 8, 1] and its electron configuration is [Ar] 4s1. The potassium atom has a radius of 227.2 pm and a Van der Waals radius of 275 pm. Potassium was discovered and first isolated by Sir Humphrey Davy in 1807. Potassium is the seventh most abundant element on earth. It is one of the most reactive and electropositive of all metals and rapidly oxidizes. As with other alkali metals, potassium decomposes in water with the evolution of hydrogen because of its reacts violently with water, it only occurs in nature in ionic salts. In its elemental form, potassium has a silvery gray metallic appearance, but its compounds (such as potassium hydroxide) are more frequently used in industrial and chemical applications. The origin of the element's name comes from the English word 'potash,' meaning pot ashes, and the Arabic word qali, which means alkali. The symbol K originates from the Latin word kalium.


Recent Research & Development for Potassium

  • Emission of highly excited electronic states of potassium from cryptomelane nanorods. Stelmachowski P, Legutko P, Jakubek T, Indyka P, Sojka Z, Holmlid L, Kotarba A. Phys Chem Chem Phys. 9/30/2015
  • Potassium tert-Butoxide-Catalyzed Synthesis of Benzofuroazepines via Cyclization of 2-Alkynyl Benzyloxy Nitriles. Gai R, Back DF, Zeni G. J Org Chem. 9/30/2015
  • Crystal structure of potassium (1S)-d-lyxit-1-yl-sulfonate monohydrate. Haines AH, Hughes DL. Acta Crystallogr E Crystallogr Commun. 9/30/2015
  • An Integrated View of Potassium Homeostasis. [No authors listed] N Engl J Med. 9/30/2015
  • Mechanisms contributing to myocardial potassium channel diversity, regulation and remodeling. Yang KC, Nerbonne JM. Trends Cardiovasc Med. 9/29/2015
  • Mass spectrometry study of N-alkylbenzenesulfonamides with potential antagonist activity to potassium channels. Martins CC, Bassetto CA Jr, Santos JM, Eberlin MN, Magalhães A, Varanda W, Gonzalez ER. Amino Acids. 9/25/2015
  • Estimation of potassium and magnesium flows in animal production in Dianchi Lake basin, China. Amachika Y, Anzai H, Wang L, Oishi K, Irbis C, Li K, Kumagai H, Inamura T, Hirooka H. Anim Sci J. 9/14/2015
  • Crystal structure of potassium sodium hepta-hydrogen hexa-molybdocobaltate(III) octa-hydrate: an extra-protonated B-series Anderson-type heteropolyoxidometalate. Park KM, Joo HC, Lee U. Acta Crystallogr E Crystallogr Commun. 9/7/2015
  • Prenatal Hypoxia-Ischemia Induces Abnormalities in CA3 Microstructure, Potassium Chloride Co-Transporter 2 Expression and Inhibitory Tone. Jantzie LL, Getsy PM, Denson JL, Firl DJ, Maxwell JR, Rogers DA, Wilson CG, Robinson S. Front Cell Neurosci. 1/26/2015

Recent Research & Development for Hydroxides

  • Effects of Annealing on the Microstructures and UV and Visible Light-Induced Photocatalytic Activities of Indium Hydroxide Nanocubes. Tingjiang Y, Wenjuan L, Siwei B, Jinmao Y. J Nanosci Nanotechnol. 10/8/2015
  • Surfactant-modified flowerlike layered double hydroxide-coated magnetic nanoparticles for preconcentration of phthalate esters from environmental water samples. Zhao X, Liu S, Wang P, Tang Z, Niu H, Cai Y, Wu F, Wang H, Meng W, Giesy JP. J Chromatogr A. 10/7/2015
  • The Effect of Nanometer Oxide Additive on the Heat-Conducting Property of Barium Hydroxide Octahydrate. Xu B, Zhang XL, Li CL, Gan W, Zhao QZ, Meng XL, Chen XD, Yuan Y. J Nanosci Nanotechnol. 9/29/2015
  • Differential ERK activation during autophagy induced by europium hydroxide nanorods and trehalose: Maximum clearance of huntingtin aggregates through combined treatment. Wei PF, Jin PP, Barui AK, Hu Y, Zhang L, Zhang JQ, Shi SS, Zhang HR, Lin J, Zhou W, Zhang YJ, Ruan RQ, Patra CR, Wen LP. Biomaterials. 9/29/2015
  • Synthesis of Cubic Alpha-Alumina Using a Blocking Reagent of Tetraethyl Ammonium Hydroxide. Kim HS, Park NK, Lee TJ, Kang M. J Nanosci Nanotechnol. 9/28/2015
  • Electron beam-induced formation of crystalline nanoparticle chains from amorphous cadmium hydroxide nanofibers. Stoychev GV, Okhrimenko DV, Appelhans D, Voit B. J Colloid Interface Sci. 9/28/2015
  • Electrochemical investigation of the voltammetric determination of hydrochlorothiazide using a nickel hydroxide modified nickel electrode. Machini WB, David-Parra DN, Teixeira MF. Mater Sci Eng C Mater Biol Appl. 2/17/2015
  • How to teach the potassium hydroxide preparation: a disappearing clinical art form. Wilkison BD, Sperling LC, Spillane AP, Meyerle JH. Cutis. 1/9/2015
  • Gold Nanoparticles Supported on a Layered Double Hydroxide as Efficient Catalysts for the One-Pot Synthesis of Flavones. Yatabe T, Jin X, Yamaguchi K, Mizuno N. Angew Chem Int Ed Engl. 3/21/2014
  • [Effects of calcium hydroxide and Hoshino's paste on the proliferation of porcine dental papilla cells]. Qiu SH, Wang J. Shanghai Kou Qiang Yi Xue. 1/25/2014

Free Test Sample Program

We recognize many of our customers are purchasing small quantities directly online as trial samples in anticipation of placing a larger future order or multiple orders as a raw material for production. Since our primary business is the production of industrial quantities and/or highly consistent batches which can be used for commercial production and purchased repeatedly in smaller quantity, American Elements offers trial samples at no charge on the following basis. Within 6 months of purchasing materials directly online from us, you have the option to refer back to that order and advise that it is the intention of your company, institution or lab to either purchase a larger quantity, purchase the material in regular intervals or purchase more on some other basis.

We will then evaluate your future needs and assuming the quantity or number of future purchases qualify, we will fully credit your purchase price with the next order. Because of the many variables in the quantity and number of orders you may place, it is impossible to evaluate whether your future order(s) will qualify for this program prior to your placing your next order. Please know American Elements strongly desires to make this free sample program available to you and will make every effort to do so once your next order is placed.