Jul. 21, 2026
Toyo Engineering Korea Limited (President: Yoshinari Miyazaki, Toyo-Korea), a subsidiary of Toyo Engineering Corporation (President and CEO: Eiji Hosoi), has been awarded a contract by HANTOK CHEMICALS CO., LTD. (HANTOK) for the construction of a Tetramethylammonium Hydroxide (TMAH) production plant in South Korea.
HANTOK is a 50:50 joint venture between Tokuyama Corporation and LOTTE Chemical Corporation. Toyo-Korea will be responsible for selected procurement activities, construction, and commissioning support. The project is scheduled for completion in FY2027.
TMAH is used as a photoresist developer in semiconductor manufacturing processes. Demand is expected to continue growing, driven by growing demand for advanced semiconductors. HANTOK plans to expand its existing TMAH production capacity by 50%. The new plant forms part of a strategic investment program aimed at establishing a reliable supply system for TMAH.
Drawing on its extensive project execution experience and engineering expertise in South Korea, Toyo-Korea will continue to support the growth of the semiconductor industry.
Project Overview
| Client | HANTOK CHEMICALS CO., LTD. |
| Contractor | Toyo Engineering Korea Limited |
| Location | Pyeongtaek, Republic of Korea |
| Facility | Tetramethylammonium Hydroxide (TMAH) Production Plant |
| Scope of Work | Selected Procurement, Construction, and Commissioning Support |
| Completion | Scheduled for FY 2027 |
Groundbreaking ceremony, held on June 19 in the Poseung District of Pyeongtaek