Established in 1959, OCI produces a wide range of chemicals, petrochemicals and carbon materials and increasingly in green energy solutions. A wholly own company of OCI Holdings in South Korea, OCI TerraSus Sdn. Bhd. (formerly known as OCI M Sdn. Bhd.) produces polycrystalline silicon which is the core material for silicon wafers and photovoltaic cells at its plant at Samalaju Industrial Park in Bintulu, Sarawak.