Potassium Hydroxide


💊 Chemical information

Ätzkali; Caustic Potash; E525; Hidróxido potásico; Hydroxid draselný; Kalii hydroxidum; Kalii Hydroxydum; Kalio hidroksidas; Kalium Hydroxydatum; Kálium-hidroxid; Kaliumhydroksidi; Kaliumhydroxid; Potash Lye; Potassium, hydroxyde de; Potasu wodorotlenek.
KOH = 56.11.
CAS — 1310-58-3.


In Eur. and Jpn. Also in USNF.

Ph. Eur. 6.2

(Potassium Hydroxide). White or almost white, crystalline, hard masses, supplied as sticks, pellets, or irregularly shaped pieces; it is deliquescent in air, hygroscopic, and absorbs carbon dioxide. Very soluble in water; freely soluble in alcohol. Store in airtight, nonmetallic containers.


(Potassium Hydroxide). It contains not less than 85% of total alkali, calculated as KOH, including not more than 3.5% of K 2 CO 3 . White or practically white, fused masses, or small pellets, or flakes, or sticks, or other forms. It is hard and brittle and shows a crystalline fracture. Exposed to air, it rapidly absorbs carbon dioxide and moisture, and deliquesces. Soluble 1 in 1 of water, 1 in 3 of alcohol, and 1 in 2.5 of glycerol; very soluble in boiling alcohol. Store in airtight containers.

💊 Adverse Effects and Treatment

💊 Uses and Administration

Potassium hydroxide is a powerful caustic that has been used to remove warts. A 2.5% solution in glycerol has been used as a cuticle solvent. An escharotic preparation of potassium hydroxide and calcium hydroxide was known as Vienna paste. Potassium hydroxide is used to adjust the pH of solutions in pharmaceutical formulations.

💊 Preparations

BP 2008: Chloroxylenol Solution; Potassium Hydroxide Solution.

Proprietary Preparations

Spain: Cerumenol. Multi-ingredient: Austria: Leberinfusion; Ger.: Acarex†; Glutarsin E†; Kalium-Magnesium-Asparaginat†; Sekudrill†; Ital.: Sekudrill.
Published May 08, 2019.