Toyo Engineering Korea wins TMAH plant contract for HANTOK in Pyeongtaek

Key highlights
Related project For subscribers
Milestones, plant data, involved companies (owners, investors, licensors, contractors) and news — kept up to date.
HANTOK Chemicals TMAH Production Plant in Pyeongtaek
Under Construction
2024-12
2026-06
Commissioning & Start-up · expected date for subscribers
—

Project

Toyo Engineering Korea Limited has been awarded a contract by HANTOK CHEMICALS to build a tetramethylammonium hydroxide (TMAH) production plant in Pyeongtaek, Republic of Korea. The plant is part of HANTOK's strategic investment program to establish a reliable supply system for TMAH.

Scope and schedule

Toyo-Korea will handle selected procurement, construction and commissioning support. The project is scheduled for completion in fiscal year 2027; a groundbreaking ceremony was held on June 19 in the Poseung District of Pyeongtaek.

Market context

TMAH is used as a photoresist developer in semiconductor manufacturing processes. Demand is expected to grow with advancing semiconductor production, and HANTOK plans to double its current TMAH production capacity with the new plant.

Client structure

HANTOK CHEMICALS is a 50:50 joint venture between Tokuyama Corporation and LOTTE Chemical Corporation.

Source: TOYO

chemXplore Weekly

The week’s project milestones and project news from the chemical industry, free every Wednesday.

Free. One email a week. Unsubscribe any time.

Related articles

19 June 2026
LOTTE Chemical Group: Hantok Chemicals breaks ground on Pyeongtaek TMAH plant

KRW 130 billion investment for a new TMAH plant on a 32,216 m² Poseung site to create a second production base and improve supply stability and logistics for semiconductor developers.

29 March 2026
LOTTE Chemical to merge with HD Hyundai Chemical after Daesan spin-off, pivots to specialty materials

Targets >60% specialty by 2030; building a 500k t/yr compounding plant; creating hydrogen value chain—four fuel-cell plants (80MW) and 450‑bar H2 hub; expanding high-end copper foil and TMAH output.

28 December 2025
LOTTE Chemical Restructures for High-Value Specialty Focus

Shifting from commodity petrochemicals, the company invests in specialty materials, hydrogen, and semiconductor solutions, while enhancing financial stability through strategic divestments.

1 October 2025
Lotte Chemical Showcases Advanced Materials at K 2025 Exhibition

Lotte Chemical presents sustainable, high-performance materials for mobility, recycling, and industrial applications at K 2025, aiming to expand in the European market.