China MOFCOM Preliminary Anti-Dumping Ruling on Japanese Dichlorosilane (DCS) Imports

Mechanism

MOFCOM's Trade Remedy Bureau initiated an anti-dumping investigation into Japan-origin dichlorosilane on 2026-01-07 (Announcement 2026 No. 2) on petition from the domestic DCS industry. The preliminary determination (Announcement 2026 No. 37, this filing) finds dumping, material injury, and causation, and imposes provisional measures in the form of customs cash deposits rather than a final duty — importers pay the deposit rate calculated on customs dutiable value (plus import VAT) starting 2026-09-08, refundable in whole or part depending on the eventual final ruling.

Rates are company-specific: Shin-Etsu Chemical (信越化学工业株式会社) and the residual "other Japanese companies" category both carry 99.2%, effectively a prohibitive rate; Denal Silane (德纳尔硅烷株式会社) carries 80.8%. Both named respondents are specialty-gas/electronic-chemicals suppliers to the global semiconductor industry — Shin-Etsu in particular is a top-tier supplier of silicon wafers and electronic-grade chemicals. DCS's role is upstream of the finished chip: it is a feedstock gas for chemical vapor deposition steps (epitaxial silicon, SiC, SiN, SiOx and polysilicon films) used across logic, memory and analog fabrication.

Interested parties have 10 days from publication to submit written comments; a final determination follows in a subsequent MOFCOM announcement (typically months later under PRC AD procedure).

Downstream implications

• Near-100% deposit rates on the two named Japanese DCS suppliers make their

China-bound shipments commercially unviable at the provisional rate, pushing Chinese fabs toward domestic DCS producers or non-Japanese alternative suppliers for this specific precursor gas.

• Comes amid a broader run of China-Japan trade-remedy and export-control

friction in 2026 (see MOFCOM Announcement 2026 No. 1, 2026-01-06, Japan dual-use export controls) — this is the mirror-image action: China using import trade defence rather than export licensing as its lever.

• Watch for the final determination (est. within ~12 months of the 2026-01-07

initiation) — historically PRC final AD rulings can adjust rates up or down from the preliminary deposit level.

Open questions

• Final-ruling timing and whether the 99.2%/80.8% deposit rates are

confirmed, reduced, or increased in the definitive duty.

• Scale of China's domestic DCS production capacity relative to the volume

previously imported from Japan — no production/import-share figure was disclosed in the primary announcement.