Potassium hydroxide

free-flowing, Redi-Dri, ACS reagent, ≥85%, pellets

Caustic potash
Linear Formula:
CAS Number:
Molecular Weight:
MDL number:


ACS reagent

vapor pressure

1 mmHg ( 719 °C)

product line









≤0.001% N compounds
≤2.0% K2CO3
10-15% water


361 °C (lit.)

anion traces

chloride (Cl-): ≤0.01%
phosphate (PO43-): ≤5 ppm
sulfate (SO42-): ≤0.003%

cation traces

Ca: ≤0.005%
Fe: ≤0.001%
Mg: ≤0.002%
Na: ≤0.05%
Ni: ≤0.001%
heavy metals: ≤0.001% (by ICP-OES)

SMILES string




InChI key


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General description

Potassium hydroxide is an inorganic salt mainly used as a precursor to synthesize other potassium compounds such as potassium acetate, potassium bicarbonate and potassium carbonate. On a commercial scale, it is synthesized by the electrolysis of potassium chloride.


Potassium hydroxide may be used in the following processes:
  • Conversion of nitriles to amide in tert-butanol.
  • Cross-coupling of aryl halides with different sulfur-, oxygen- and nitrogen-based nucleophiles in dimethyl sulfoxide.
  • As an activator for the preparation of activated carbons from corn cobs.
  • As a base for the N-alkylation of nitrogen heterocycles in polyethylene glycol-ether solvents.
  • Synthesis of (S)-1-(4-benzyl-2-thioxothiazolidin-3-yl)propan-1-one from (S)-phenylalaninol.
  • To catalyze the polymerization of propylene oxide.
Redi-Dri is an innovative packaging product line that helps eliminate clumping material by adding extra packaging process steps without any chemical additives, anti-clumping agents, or hydrophobic compounds. Redi-Dri offers a more convenient and safer way to handle the products.

Legal Information

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC


CorrosionExclamation mark




Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1A


8B - Non-combustible, corrosive hazardous materials

WGK Germany


Flash Point F

Not applicable

Flash Point C

Not applicable

Certificate of Analysis

Certificate of Origin

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