Japan protests China’s new export clampdown on a key chipmaking chemical

On Tuesday, Japan lodged a formal protest after Beijing announced it would start requiring cash deposits on imports of dichlorosilane (DCS) from Japanese firms. The move, described by Chinese authorities as a provisional anti‑dumping step, could force exporters like Shin‑Etsu Chemical and Denal Silane to lock up nearly the entire value of each shipment.

In practice, the new rule means that any company bringing DCS into China must hand over a deposit of up to 99.2% of the cargo’s declared value to customs. The requirement is slated to take effect immediately, and while China says the measure is temporary while an investigation runs, the uncertainty is already rattling Japanese chip‑making suppliers.

For context, DCS is a specialty gas used in the chemical‑vapor‑deposition process that builds the ultra‑thin silicon layers inside modern logic and memory chips. Japan dominates the market for ultra‑pure DCS, making the material a linchpin in the global semiconductor supply chain. Any disruption, even a short‑term one, could ripple through factories that rely on steady deliveries.

Tokyo’s response was swift. Chief Cabinet Secretary Minoru Kihara told reporters that the government is “studying the potential impact on Japanese companies” and vowed to “respond appropriately” to prevent unfair harm. The protest comes amid already‑tense Sino‑Japanese relations, which have been frayed since November when Prime Minister Sanae Takaichi hinted that Japan might intervene if China ever used force against Taiwan.

Beijing, on its side, frames the action as a standard anti‑dumping probe, part of a broader suite of measures targeting Japanese firms that produce dual‑use items with possible military applications. The commerce ministry said a final ruling will be issued once the investigation wraps up, but no timeline was given.

Industry observers note that while the deposit requirement is a blunt instrument, it also signals Beijing’s willingness to leverage trade tools in geopolitical disputes. Japanese chip manufacturers are now scrambling to assess inventory buffers, explore alternative sources, and engage diplomatic channels to defuse the situation before production lines feel the pinch.