Potassium Hydroxide



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Product Code Available Product Forms Request A Quote
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


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


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

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 & Element Information

Elemental PotassiumSee 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. Potassium Bohr ModelAs 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.