Potassium hydroxide is an inorganic compound with the formula KOH, and is commonly called caustic potash.
Along with sodium hydroxide, this colorless solid is a prototypical strong base. It has many industrial and niche applications. Most applications exploit its re-activity toward acids and its corrosive nature. KOH is noteworthy as the precursor to most soft and liquid soaps as well as numerous potassium-containing chemicals. Dry potassium hydroxide is produced by evaporating the water from liquid potassium hydroxide (LKOH). It is sold in flake and walnut (briquette) forms. Flake potassium hydroxide is literally "flaked" off a large cooling wheel used to solidify the molten product. Walnut potassium hydroxide is made by compacting flake product into walnut-shaped briquettes for ease and efficiency of use.
The major end uses for dry product are similar to liquid product and include the following industries: petroleum, potassium chemicals, gas purification, industrial soaps, drugs, pharmaceuticals, flavors and fragrances, alkaline batteries, organic chemicals and dyestuffs. The primary end use for walnut-shaped dry product is in the natural gas industry.