Tosoh Corporation manufactures and sells basic chemicals, petrochemicals, specialty products, and fine chemicals worldwide.

It operates through four segments: Petrochemical, Chlor-Alkali, Specialty, and Engineering.

The company provides advance materials, including battery, fabricated quartzware, silica glass, thin film depositions, zeolites for catalysts and molecular sieves, zirconia injection mold components and compounds, zirconia grinding and dispersion media, and zirconia fine beads and powders.

It also offers chromatographic columns, and media and diagnostic systems; clinical diagnostic systems; Portland cement and blast-furnace slag cement; and caustic soda, vinyl chloride monomer, calcium hypochlorite, and sodium bicarbonate.

In addition, the company provides ethylene, propylene, C4 fraction, tertiary butyl alcohol, cumene, and aromatic compounds; and ethyleneamines, bromine, hydrobromic acids, flame retardants, non-aqueous solvents, chelating agents, ethylene dichloride, and sodium styrenesulfonate.

Further, it offers polymers, such as ethylene vinyl-acetate copolymers, adhesive polymers, low and high-density polyethylene products, synthetic rubbers, functional polymers, and polyvinyl chloride pastes; and polyurethanes (PU), including methylene diphenyl diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, adhesives, coating resins, elastomers, polyisocyanates for PU paints, and polyols.

The company manufactures and sells water treatment systems; and engages in the construction and repair businesses.

It serves chemical and petrochemical, construction, automotive, consumer electronics, information technology, bioscience, and environmental markets.

The company was incorporated in 1935 and is headquartered in Minato, Japan.