Caustic Potash Flakes, or potassium hydroxide, are highly caustic compounds used in the manufacturing of fertilizers, soaps, and detergents. They are also essential in the production of biodiesel and as a reagent in chemical laboratories. In the food industry, caustic potash is used to process certain foods, and in the petroleum industry, it is used for refining crude oil. It also plays a role in chemical syntheses and water treatment.