Tungsten Hexafluoride Crunch Reshapes Chip Gas Supply as China Export Value Jumps 345%

Tungsten hexafluoride, a specialty gas known as WF6, has become one of the tightest links in the semiconductor supply chain in 2026, and the centre of gravity for that supply has moved to China. The largest single production base sits in Handan, in Hebei province, where CSSC Peric Special Gases runs an annual capacity of 2,000 tons of ultra-high purity WF6. As of late August 2026 the global market remains short of the gas, Chinese plants are running close to full utilisation, and the balance is not expected to loosen before new lines start up.

WF6 is used in chemical vapor deposition to lay down tungsten films inside chips, and those films form the contacts and interconnects that carry electrical signals. Demand rises sharply with device complexity, because a 3D NAND stack of more than 200 layers needs roughly one deposition cycle per layer. High bandwidth memory and logic nodes below 7 nm depend on the same step, and no mature substitute exists for most of these applications.

The disruption began upstream. China placed tungsten items on its dual-use export control list in February 2025 and tightened the rules again in early 2026. Since China accounts for more than 80 percent of world tungsten supply and Japan has almost no domestic resource, Japanese WF6 producers lost access to high-purity tungsten powder, the feedstock that represents 60 to 70 percent of production cost. Customs figures reported by Kyodo News showed Chinese tungsten powder shipments to Japan at zero for three straight months from February to April 2026.

Kanto Denka Kogyo and Central Glass notified customers including Samsung Electronics, SK Hynix and TSMC in April 2026 that WF6 production would stop permanently. Final shipments left on June 30 and both lines closed on July 1, 2026. Mitsui Chemicals had already exited the market in February 2026. The combined withdrawal removed roughly 2,200 tons per year, close to a quarter of global capacity, against demand that industry estimates put above 11,000 tons for the year.

Prices moved accordingly. China's General Administration of Customs reported an average WF6 export price of 149.79 dollars per kilogram in April 2026. Domestic 5N material rose from 523 yuan per kilogram a year earlier to about 1,810 yuan, while 6N grade quotes reached 2 to 2.5 million yuan per ton by late June. Korean and Japanese suppliers, among them SK Specialty, Foosung and Kanto Denka Korea, had already notified Samsung, SK Hynix, DB HiTek and Magnachip of contract increases of 70 to 90 percent for 2026.

Trade data through July 2026 shows how far the balance has tilted. Chinese WF6 exports reached 79.7 tons in July, up 118 percent year on year, for a value of 125.4 million yuan, a rise of 815 percent. Cumulative exports for January to July came to 335.5 tons, up 39 percent, with export value up 345 percent to 393.8 million yuan. Imports tell a different story. July import volume was 32.9 tons, only 4 percent above the same month last year, and cumulative import value for the seven months fell 21 percent even as import volume rose 39 percent to 214 tons.

CSSC Peric published half-year results in July that reflected the shift. Revenue reached 1.904 billion yuan, up 83.13 percent year on year, and net profit attributable to shareholders came to 348 million yuan, up 95.63 percent. Second-quarter revenue alone grew about 129 percent. Tungsten hexafluoride revenue rose close to threefold and became the main growth driver. The company also moved its WF6 business to independent pricing from the third quarter of 2026, replacing formula-linked contracts with pricing that references supply, demand, industry trends and the competitive landscape.

The company disclosed in August that its board had approved new research projects, including work on 7N grade WF6 at 99.99999 percent purity, as it pushes toward higher specifications. On capacity, an additional 1,000 tons per year of WF6 forms part of a wider electronic gas project and is expected to start up in 2027, which would lift total capacity to 3,000 tons per year.

Other Chinese producers are filling in behind. Borui Zhongxiao, the joint venture that handles WF6 for Zhongju Xin, runs 600 tons per year with no expansion announced. Haohua Gas, a subsidiary of Haohua Technology, holds roughly 600 tons per year of 6N capacity and has qualified its product at domestic wafer fabs. Heyuan Gas has planned 500 tons per year but remains in trial production, without completed certification at leading customers or signed orders, so it is unlikely to add meaningful volume in the near term.

Certification is the real constraint. Fabs typically need 12 to 24 months to qualify a new gas source, because a single impurity deviation can scrap an entire wafer lot. That timeline means the gap left by Japan cannot be closed quickly, even where physical capacity exists. Buyers have responded with longer contracts and larger buffers. SK Specialty signed a long-term agreement to supply Samsung with 150 tons per month, and Foosung started qualification work with Chinese material.

The cost is spreading downstream. WF6 accounts for a small share of total chip manufacturing cost, which allows memory makers with high margins to absorb increases, but China's price monitoring authorities named the gas in February as one of the inputs supporting the memory price rally. TrendForce expects conventional DRAM contract prices to rise 13 to 18 percent and NAND flash 10 to 15 percent in the third quarter of 2026, a slower pace than earlier in the year but still upward.

Analysts expect supply and demand to stay tight into 2027, until new Chinese lines come online and qualification cycles at overseas fabs are complete. The episode has also pushed chipmakers to examine molybdenum for selected deposition steps and to look at tungsten sources outside China, including the Sangdong mine in South Korea, although neither route will provide relief this year.