Tokyo Ohka Kogyo Completes Pyeongtaek High-Purity Chemical Plant in South Korea

Tokyo Ohka Kogyo has completed construction of the Pyeongtaek Plant in Gyeonggi Province, South Korea, at its consolidated subsidiary TOK Advanced Materials. Phase 1 includes a high-purity chemical manufacturing building with cleanroom areas for semiconductor production, plus warehouses, on roughly 6,300 square meters with an investment of about ¥12.0 billion. Operations are scheduled to start in the first half of 2027, making it the Group's second South Korean production site.

Key facts

Market context

Photoresists are light-sensitive polymer materials that are applied to silicon wafers and patterned by lithography, forming the masks that define circuit features during chip fabrication. High-purity process chemicals, such as cleaning solvents, developers and etchants, are used alongside them in wafer processing, where even trace contamination can reduce yields. Demand is driven mainly by semiconductor manufacturing, including memory and logic fabs, and by the advanced packaging and display supply chains that rely on similar materials. Local production close to large chipmaking customers generally shortens delivery lead times, reduces logistics exposure and allows suppliers to respond faster to qualification and process changes. For buyers, a regional supplier with dedicated cleanroom capacity can improve supply security, while for the market it adds capacity in a concentrated chemical segment where a small number of established suppliers compete on purity, consistency and technical support.

Source: official release on tok.co.jp. Summary and context written by Market Krystal.