China Imposes Up to 99.2% Provisional Anti-Dumping Deposits on Japanese Dichlorosilane
nashnova research
China's commerce ministry on Sept 7 imposed provisional anti-dumping deposits of up to 99.2% on dichlorosilane imported from Japan, effective Sept 8 — nearly doubling the landed cost of a critical chipmaking gas and forcing a repricing across the semiconductor-materials supply chain.
What is dichlorosilane, and why can't chipmakers do without it?
Dichlorosilane (DCS, SiH₂Cl₂) is a colorless, toxic gas used in thin-film deposition — layering ultra-thin functional films onto silicon wafers during chip fabrication.
Logic chips, memory chips, and analog chips all rely on it to grow epitaxial films, silicon-nitride films, silicon-oxide films, and more — virtually every mainstream chip type needs DCS.
This means → DCS is not a niche input for one chip category. It is a universal base material for the entire wafer line; a supply cut or price spike ripples downstream.
How are the deposit rates split, and who gets hit hardest?
Shin-Etsu Chemical (信越化学), the world's largest semiconductor-wafer and electronic-chemicals supplier, faces the top rate of 99.2% — effectively doubling its export price to China.
Denka Silane (德纳尔硅烷), a specialty semiconductor-gas maker, draws a lower but still steep 80.8%.
All other Japanese companies face 99.2%. In plain terms = apart from Denka's slightly lower figure, the entire Japanese DCS industry sees its China-bound costs roughly double.
How is the deposit actually calculated?
Formula: Deposit = (customs-assessed dutiable value × deposit rate) × (1 + import VAT rate).
This means → the real burden exceeds the headline rate, because VAT is levied on top of the deposit — a tax-on-tax effect.
The deposit applies to all new import shipments from Sept 8, assessed ad valorem by customs.
Where does the investigation stand, and what comes next?
The probe opened on Jan 7, 2026 and took roughly eight months to reach a preliminary ruling; China is now in the provisional-measures phase, not a final determination.
Interested parties have 10 days from the announcement to submit written comments — one of the last windows to argue for a rate adjustment.
This reflects that the final rate still has room to move, but given the severity of the preliminary ruling, a sharp reduction looks unlikely.
What does this mean for the market?
Japan is a core source of China's DCS imports. A near-doubling in deposits will force downstream fabs to seek alternative supply or absorb the cost themselves.
The ministry stated it "has always applied trade-remedy measures prudently and with restraint," yet 99.2% already ranks among the highest rates in China's anti-dumping history.
This means → China's domestic push to localize semiconductor materials may accelerate in the near term, but whether homegrown capacity and purity can keep pace remains the key variable the market is watching.
市场有风险，内容仅供研究参考，不构成投资建议。