Olin is the second-largest supplier in the Western Hemisphere of potassium hydroxide (KOH) or caustic potash. We produce 45 percent and 50 percent potassium hydroxide (KOH) solutions for use in a wide range of applications. Olin ships potassium hydroxide by tank truck, rail car or barge. These shipments are sent directly to customers or to a network of strategically located terminals to allow for further distribution of the product, domestically and internationally.