Orichem International, Ltd.
- Fine-chemical manufacturing and trading group in China, whose products include dyes, pesticides, nutritional supplements, herbal products, and a range of organic intermediates.
- http://www.orichem.com

OxyChem
- The chemicals segment of Occidental Petroleum Company, producing chlorine, caustic soda, PVC, mercaptan odorizing agents, resorcinol, and other performance products.
- http://www.oxy.com/OXYCHEM/CHEMICALS.htm

Occidental Chemical Corporation
- Producer and marketer of basic chemicals, petrochemicals, polymers, plastics, and specialty products.
- http://www.oxychem.com/