China to impose security deposits on Japanese dichlorosilane imports starting September 8

China’s Ministry of Commerce will begin collecting security deposits on dichlorosilane imports from Japan on September 8, 2026, implementing a provisional anti-dumping measure that strikes at a niche but vital corner of the global semiconductor supply chain. Dichlorosilane, or DCS, is a high-purity toxic gas used in the thin-film deposition processes that are fundamental to fabricating semiconductor chips. Japan happens to be one of the world’s leading suppliers of the ultra-high-purity variety. How we got here The security deposit announcement is the latest step in a formal anti-dumping investigation that MOFCOM launched on January 7, 2026. The probe was triggered by an application from Tangshan Sanfu Electronic Materials Co. Ltd., a domestic DCS producer that argued Japanese imports were undercutting Chinese manufacturers. The core complaint: Japanese dichlorosilane shipments to China increased significantly between 2022 and 2024, while prices dropped by 31% over the same period. The investigation covers a dumping assessment period from July 1, 2024, to June 30, 2025, with the broader injury analysis stretching back to January 1, 2022. MOFCOM expects to wrap things up by January ...