OCI Company Ltd. (formerly DC Chemical) (www. oci. co. kr/) is a global chemical company with a product portfolio spanning the fields of inorganic chemicals, petro and coal chemicals, fine chemicals, and renewable energy materials. In 2006, the company started its polysilicon business and successfully completed its 6,500 metric ton P1 plant in December 2007. The 10,500 metric ton P2 expansion was completed in July 2009 and P3 with another 10,000 metric tons brought the total capacity to 27,000 metric tons at the end of 2010. The debottlenecking of P3, foreseen in 2011, should then increase the capacity to 42,000 tons at the end of the year. Further capacity expansions P4 (20,000 tons by 2012) and P5 (24,000 tons by 2013) have already started (P4) or will commence in the second half of this year (P5).