Potassium hydroxide is a strong inorganic basic compound, chemical formula KOH. It is a non-flammable hydrophilic substance and is therefore highly corrosive to metals and tissues. It readily absorbs moisture from the atmosphere and forms a corrosive solution that corrodes aluminum and zinc.

Potassium hydroxide is used in chemical manufacturing, petroleum refining and cleaning formulations.

Potassium hydroxide is also known as potash.

Corrosion encyclopedia explains potassium hydroxide

Potassium hydroxide (KOH) is an inorganic substance that is alkaline and completely decomposed into potassium ions (K+) and hydroxide ions (OH-) in water. Decomposition in water produces heat and violent sounds and reactions.

Uses of potassium hydroxide include:

Intermediates in industrial manufacturing processes, such as the manufacture of fertilizers, potash or other potash salts and organic chemicals

Making detergents and alkaline batteries

Manufacture drain cleaning products, paint remover and degreaser

Removal of organic acids and sulfur compounds from petroleum refineries.

Potassium hydroxide solutions corrode aluminum and its alloys due to the formation of hydrogen. This corrosion attack can be prevented by adding the corresponding potassium salt of the acid.

Potassium hydroxide is very similar to sodium hydroxide (NaOH) in terms of corrosion behavior and safety requirements. Although potassium hydroxide is slightly more corrosive, this is generally associated with its higher boiling point and increased likelihood of exposure to high temperatures. The sensitivity of nickel alloy to stress cracking in kOH is lower than that in NAOH. Plastics and linings have the same level of resistance to potassium hydroxide and sodium hydroxide, with the exception of fiberglass reinforced plastics, which are less resistant to potassium hydroxide regardless of the type of resin used.

Potassium hydroxide or potash caustic is an lye used for cold and hot soaps. The soap produced by potassium hydroxide has a putty - like, almost liquid texture, perfect for making beaten soap.

Potassium hydroxide is an alkaline product similar to sodium hydroxide. It can be used in fertilizers, batteries, soaps/detergents, specialty glass, and is a chemical intermediate in dyes and pharmaceuticals.