The story of Olin Chlor Alkali began with chlorine. We were the first company to produce it commercially in North America, and we are experts in every aspect of chlorine-based chemicals and chemistry. Our chemists continually look for new ways to bring value to our customers through better and more varied use of chlorine. Chlorine chemistry is essential to 86 percent of crop protection chemicals and 93 percent of all prescription pharmaceuticals sold in the U.S.