Provisional anti-dumping measures will be imposed on dichlorosilane (DCS) imported from Japan, following a preliminary ruling that the product was being dumped in the Chinese market, China's Ministry of Commerce announced on Monday.

In accordance with China's anti-dumping regulations, importers will be required to provide cash deposits to Chinese customs at rates ranging from 80.8% to 99.2%, based on each company's designated margin ratio, effective September 8, 2026.

The investigation was initiated on January 7, 2026, in response to an application from the domestic industry. The probe was conducted in strict compliance with Chinese laws, regulations and World Trade Organization rules.

Preliminary evidence showed that dumped Japanese imports had caused substantial material injury to the domestic industry, and that a causal relationship existed between the dumping and the injury, the ministry's spokesperson said.

China exercises prudence and restraint in using trade remedy measures and remains committed to fair and free trade, the spokesperson added. The ministry will continue its investigation in accordance with the law, fully safeguard the rights of all interested parties, and issue an objective and fair final ruling based on the findings.

DCS is a key material in chip manufacturing, primarily used in thin-film deposition processes – such as epitaxial films, silicon carbide films, silicon nitride films, silicon oxide films and polysilicon films – for the production of logic chips, memory chips, analog chips, among others. It is also used in the synthesis of silicon-based precursors and polysilazanes.