Potassium Hydroxide (Caustic Potash) Potassium hydroxide: is an inorganic compound with the chemical formula KOH. It is also known as lye it is commonly referred to as caustic potash, it is a potent base that is marketed in several forms including pellets, flakes, and powders. Some common uses for Potassium Hydroxide: Soap Making / Bio-Diesel Production / Battery Electrolyte / Natural gas refining / Chemical Reagent / Fertilizers/ pH Increaser / Tanning (Hair Remover) / Desiccant / and much more. cas#1310-58-3