Caustic soda or sodium hydroxide is a natural product co-production of chlorine, the chemical law does specify that for every ton of chlorine produced, about 1100 kg of caustic soda is also produced, together with 28 kg of hydrogen. This is an important reactant in the production of useful organic chemicals (more than 30% of the production of caustic get into this application). Inorganic chemicals such as paint, glass, ceramics and usefulness in fuel cell production and cosmetics are also very important.