Producer
Showa Denko K.K. (Resonac Holdings)
Japanese specialty chemicals; key disilane producer for semiconductor CVD; high-purity Si2H6 for NAND flash and logic ICs; also building US silane facility JV with SK Materials
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1
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2 inputs Showa Denko K.K. (Resonac Holdings) supplies
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Semiconductor Process Gases (Disilane)
25%Electronic Materials (Resonac)
Advanced Carbons & Ceramics
20%Petrochemicals & Specialty Chemicals
20%
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Origin2023
Showa Denko K.K. (rebranded as Resonac Holdings in 2023 after merging with Hitachi Chemical in 2020) traces to the 1939 merger of Showa Fertilizers and Denko (the Electrode Company) — a Japanese industrial chemicals company combining fertilizer and electrochemical production. The company had a catastrophic product safety incident in 1989-1990 when its genetically engineered L-tryptophan dietary supplement (produced using a modified bacterial fermentation process) caused eosinophilia-myalgia syndrome (EMS) in approximately 1,500 Americans, with 37+ deaths. Showa Denko paid approximately $2 billion in damages, one of the largest supplement liability settlements in US history. The disaster was traced to a specific Showa Denko fermentation strain used in December 1988 that produced a toxic impurity. The incident contributed to the FDA's enhanced scrutiny of dietary supplements and was a factor in the debates that led to the Dietary Supplement Health and Education Act (DSHEA) of 1994. After this consumer product disaster, Showa Denko pivoted further toward industrial chemicals and semiconductor materials, eventually becoming a key supplier of disilane (Si2H6) for NAND flash memory CVD processes. The 2020 merger with Hitachi Chemical and the 2023 Resonac rebranding represent the company's transformation from a company known for a food safety disaster to a critical semiconductor materials supplier.
Resonac Holdings Corporation ↗