TOSOH CORPORATION is a Japan-based company mainly engaged in the provision of chemical products. The Company operates in four business segments. The Petrochemicals segment is engaged in the manufacture and sale of olefin products, polyethylene, processed resin products and functional polymers. The Chlor-alkali segment offers caustic soda, vinyl chloride monomers, vinyl chloride resin, inorganic and organic chemicals, cement, urethane materials and others. The Functional Products segment provides inorganic and organic fine chemicals, measuring and diagnostic products, electronic materials and functional materials. The Engineering segment is engaged in the manufacture and sale of water treatment equipment, water purifying equipment and ion-exchange resin, as well as the design and construction of plant works and electrical works. The Company is also engaged in the provision of transportation and warehouse service, inspection and analysis service, and the information processing business.