Tungsten Hexafluoride Prices Surge Over 230% Year-to-Date as Japan Production Halt Warnings Reshape Semiconductor Material Supply Chain
Alina Collins
China's 5N-grade tungsten hexafluoride has surged over 230% year-to-date; two major Japanese producers warned of production halts after China's tungsten exports to Japan fell to zero, tilting pricing power over a critical chipmaking material from downstream fabs toward the upstream resource holder.
How much have prices actually risen — and why now?
5N-grade tungsten hexafluoride (WF₆ — a gas essential for depositing metal layers inside chips) is quoted at ¥1,670–1,810/kg in China, up from ¥523/kg a year ago — a roughly 232.7% jump.
6N-grade product for sub-3nm processes has hit ¥2.2–3.0 million/tonne, more than double the ¥0.8–1.0 million/tonne seen under normal supply. The highest-purity 7N grade is at ¥3.3–3.6 million/tonne.
This means → the rally is not a single-grade anomaly. It runs across the entire purity spectrum, with higher-purity grades seeing the steepest moves.
Is the Japanese shutdown warning real?
Kanto Denka and Central Glass warned Samsung and SK Hynix in late May to early June that they cannot maintain normal production from July 1. Together the two hold about 2,200 tonnes of capacity — roughly 25% of the global total.
The core issue: over 90% of their tungsten feedstock comes from China, and China's tungsten exports to Japan have been zero for three consecutive months since February 2026.
On June 8, however, Kanto Denka publicly clarified it "can still procure tungsten feedstock from China" and that "permanent shutdown" is not the reality. In plain terms = supply is genuinely disrupted and customers have been warned, but the chain has not snapped entirely — this is a real supply shock, not an industrial extinction event.
Why can't chipmakers just substitute something else?
WF₆ is a required deposition material for 3nm/5nm logic chips, 3D NAND flash, and HBM high-bandwidth memory. There is no commercial substitute today.
Global fabs consume roughly 8,000–11,000 tonnes per year: Samsung about 920–1,000 t, TSMC about 900–1,000 t, SK Hynix about 700 t, Micron about 500 t.
Claims that molybdenum can replace tungsten are overstated — Mo substitution applies only to a handful of word-line layers in 3D NAND, covering less than 0.4% of total demand. This means → whoever controls tungsten supply effectively holds a chokepoint over advanced chip manufacturing.
How is China positioned to fill the gap?
China holds over 80% of global tungsten ore reserves, yet high-purity WF₆ was long dominated by Japanese, Korean, and American producers. After two decades of process development, Chinese firms have lifted their domestic market share from under 5% to about 65%.
CSSC Gas (中船特气) has 2,000 t of capacity now, adding another 1,000 t by 2027. Haohua Technology (昊华科技) and Juhua (中巨芯) each have 600 t; Haute Gas (华特气体) about 200 t.
CSSC Gas's 5N and 6N products are qualified and shipping in volume to TSMC, Micron, SK Hynix, and SMIC. This reflects a deliberate pairing: China restricted tungsten exports and built the domestic capacity to backfill the resulting gap — controlling the valve and holding the reserve at the same time.
A-share stocks have soared — can valuations hold?
CSSC Gas is up 865% year-to-date on a trailing P/E of 447×. Juhua rallied over 180% in 30 trading days, then issued a clarification on June 21 stating it has "not signed any large WF₆ contracts." Haohua doubled, yet its 2025 annual report shows WF₆ revenue at just 0.13% of total sales.
Even at the current 6N price of ¥2.2 million/tonne, the entire global WF₆ market is worth under ¥20 billion — a size that struggles to support hundreds of billions in combined market-cap growth expectations.
In plain terms = share prices are betting on the extreme scenario of a Chinese pricing monopoly. If Kanto Denka secures feedstock through third-party channels, or if export policy eases at the margin, the current pricing logic could break — the market-size ceiling is simply there.
What bigger shift does this episode reveal?
The WF₆ price shock is, at its core, a structural stress test of the global semiconductor supply chain: when upstream resources are concentrated enough and downstream demand is rigid enough, the resource-holding nation can impose reverse leverage on the manufacturing nations.
Whether this logic persists depends on two variables: the policy trajectory of China-Japan tungsten export controls, and how far Japanese firms can diversify their feedstock sources.
This signals a broadening of the semiconductor battlefield — from "who can build the most advanced chips" to "who controls the critical materials needed to build them." Pricing power at the materials tier is becoming a new strategic lever.
Content is for reference only, not financial advice.