China imposes anti-dumping measures on Japanese semiconductor chemicals

China just slapped provisional anti-dumping duties on a critical semiconductor chemical imported from Japan, with deposit rates reaching as high as 99.2% of the import value. The target: dichlorosilane, a compound most people have never heard of but one that sits at the heart of modern chip manufacturing. China’s Ministry of Commerce issued a preliminary ruling on September 7 finding that Japanese-origin dichlorosilane, commonly known as DCS, had been dumped into the Chinese market at artificially low prices. The measures take effect September 8, requiring importers to pay cash deposits before bringing in the material. The numbers tell the story Shin-Etsu Chemical, one of Japan’s largest chemical producers and a dominant force in semiconductor materials, drew the steepest rate at 99.2%. Most other Japanese producers face the same ceiling. Denal Silane got a comparatively lighter rate of 80.8%. The investigation behind these measures was initiated on January 7, 2026, following an application filed on December 8, 2025 by Tangshan Sanfu Electronic Materials Co., a domestic DCS producer. Chinese authorities examined Japanese import data covering the period from July 1, 2024 through Jun...