# Tosoh to expand HDI derivatives capacity at Nanyo Complex

Tosoh Corporation plans to increase production capacity for hexamethylene diisocyanate (HDI) derivatives at its Nanyo Complex in Shunan City, Yamaguchi Prefecture. The expansion will increase capacity by 50% to 30,000 metric tons per year, with an investment of approximately ¥6 billion. Construction starts May 2025, commercial operation from August 2026.

- Type: Expansion
- Announced: 2024-12-03
- Where: Nanyo Complex, Shunan City, Yamaguchi Prefecture, Japan
- Value: $41.5M (6.00B JPY)
- Starts operating: Aug 2026
- Status: announced
- Capacity: 30,000 metric tons per year
- Products: hexamethylene diisocyanate (HDI) derivatives (Coronate brand)
- Sectors: [Specialty Chemicals](https://endata.com/sectors/specialty-chemicals.md)

## Companies

- [Tosoh](https://endata.com/companies/19811.md)

## Sources

- [tosoh.co.jp](https://www.tosoh.co.jp/news/release/2024/20241203.html), 2024-12-03: "本計画により安定供給を図るとともに、伸長する需要に対応し今後も更なる事業規模の拡大と収益力の強化を図っていきます。"
- [polymerupdate.com](https://www.polymerupdate.com/PressRelease/Details/34269), 2024-12-03: "The increase to HDI derivatives production capacity is thus a strategic move by Tosoh to position itself to capitalize on growing demand for and to ensure the stable supply of HDI derivatives."

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Data from Endata (https://endata.com/). Announcements are summarized from public sources and may be incomplete; check the linked originals.