The pressure on critical materials is once again hitting the semiconductor industry. This time, the focus is on tungsten and one of its most sensitive derivatives used in chip fabrication: tungsten hexafluoride, known as WF₆. According to TrendForce and various market reports, some Japanese suppliers of this special gas may have warned South Korean manufacturers about potential raw material supply problems, with inventories possibly running out by mid-2026.
This is not a minor issue. WF₆ is used in chemical vapor deposition (CVD) processes to form tungsten films on wafers. These layers are essential for building contacts, vias, and electrical interconnections within chips. In 3D NAND memory, advanced DRAM, and high-density logic processes, the stability and purity of these materials directly impact performance, reliability, and manufacturing capacity.
A small volume gas, but critical in manufacturing
Although tungsten hexafluoride is not visible to consumers, it is part of the chemistry that enables the production of modern chips. TrendForce explains that this compound acts as a precursor in CVD processes. Under high temperatures, it reacts with reducing agents like hydrogen to deposit thin tungsten films onto wafer surfaces.
Tungsten is chosen for its low resistivity, high melting point, and resistance to electromigration. Practically, it helps construct conductive structures capable of transporting signals within the chip with less delay and higher reliability. In high-density devices like 3D NAND, its ability to fill narrow gaps and maintain good conductivity is especially important.
| Uses of WF₆ in semiconductors | Why it matters |
|---|---|
| W tungsten film deposition | Enables creation of conductive layers on wafers |
| Contacts and vias | Connect internal chip layers |
| Electrical interconnections | Facilitate signal transmission |
| Tungsten silicide | Improves specific structures in integrated circuits |
| 3D NAND | Supports high-density vertical structures |
| Advanced nodes | Enhances performance, reduces power consumption, increases reliability |
The core issue is less about demand for the gas itself and more about the raw material that allows its production with semiconductor-grade purity: high-purity tungsten powder. This is where Japanese vulnerability appears. As reported by TrendForce citing Chinese customs data gathered by Kyodo News, tungsten carbide and tungsten powder exports from China to Japan fell to zero between February and April 2026.
Japan, China, and tungsten dependency
Japan has a significant industry in specialty gases and high-purity materials but lacks substantial domestic tungsten reserves. For critical materials like semiconductor-grade WF₆ and high-purity tungsten powder, reliance on China can be total, according to sector information cited in the market.
China controls a large part of the global tungsten supply chain. It has also incorporated related products into export controls as part of broader policies on dual-use materials. In February 2025, Beijing announced restrictions on tungsten, tellurium, bismuth, molybdenum, and indium. Additionally, in January 2026, it tightened restrictions on certain dual-use goods destined for Japan when they could support Japanese military capabilities.
| Geopolitical factor | Industrial impact |
| China controls much of the tungsten supply chain | Increased exposure for importing countries |
| Japan depends on external raw materials | Risk for high-purity special gases |
| Chinese export controls | Greater supply continuity uncertainty |
| Dual-use materials | More reviews, licenses, delays |
| High purity requirements | Not all suppliers can be quickly replaced |
| Long validation processes | Changing suppliers may take months |
While China claims that civilian users shouldn’t be affected, trade data and supply alerts suggest that Japanese industry is under real pressure. The key issue is not just the presence of tungsten in the market but whether it is available with the purity, stability, certification, and traceability needed for advanced semiconductor processes.
Samsung, SK hynix, and TSMC closely monitoring the risk
TrendForce indicates the global WF₆ supply structure is led by China and Korea, with Japan and Europe playing secondary roles. Chinese suppliers would account for over 50% of the global market, supported by tungsten resource advantages and capacity expansion. Japan, though smaller in capacity, is valued for lot consistency, product stability, and technical expertise—qualities highly regarded in advanced manufacturing.
Potential disruptions from Japanese suppliers mainly affect Korean memory manufacturers. Samsung appears to be among the most exposed due to its dependence on Japanese WF₆. SK hynix may have more flexibility, sourcing from Korean suppliers like SK Specialty and Foosung, as well as Chinese alternatives. Nevertheless, switching semiconductor suppliers is not immediate.
| Company or block | Noted exposure |
| Samsung | High reliance on Japanese WF₆ supply historically |
| SK hynix | More flexibility with Korean and other alternatives |
| TSMC | Potential exposure in advanced logic, impact unconfirmed |
| Japanese suppliers | Raw tungsten shortage risk |
| Chinese suppliers | Large global share but high-grade validation ongoing |
| European industry | Limited alternative capacity and more advanced recycling processes |
Validating a special gas for a chip fab can take a long time. It’s not just about chemical equivalence; purity, stability, process behavior, performance impact, equipment compatibility, defectivity, and traceability must all be confirmed. Market sources mention certification timelines exceeding 18 months, though urgency might accelerate some steps.
Memory is once again the most vulnerable point
The most delicate impact concerns memory. 3D NAND involves complex vertical structures with multiple deposition cycles. Advanced DRAM also depends on tightly controlled materials and processes. If WF₆ supply tightens, manufacturers could face higher costs, production delays, or restrictions on certain lines.
This does not mean Samsung, SK hynix, or TSMC will immediately halt production. Major companies usually manage inventories, alternative contracts, and contingency plans. Still, it adds pressure to a supply chain already strained by AI demand, memory price hikes, shortages of some materials, and geopolitical restrictions.
| Affected segment | Potential risk |
| 3D NAND | Increased pressure on deposition and interconnection layers |
| Advanced DRAM | Risks in highly-stable process areas |
| Advanced logic chips | Possible delays if validated materials are unavailable |
| AI and data centers | Indirect costs from higher memory and storage prices |
| Smartphones and PCs | Potential cost pass-through later |
| SSDs and storage | Increased pressure if NAND costs rise |
Memory is already experiencing a bullish cycle, driven by AI demand boosting DRAM, NAND, HBM, and enterprise SSD usage. Any additional material stress could push prices higher and reduce manufacturers’ margins in meeting demand.
Prices moving ahead of total scarcity
In critical materials markets, prices tend to react before supply disruptions fully materialize. TrendForce warns that expectations of shortages have already driven WF₆ prices higher. If tension persists, chip production costs could rise, passing increases to system manufacturers, data centers, and eventually consumers.
In Japan, related tungsten products are already seeing price hikes. Sumitomo Electric reportedly raised prices by up to 60%, while Mitsubishi Materials tripled prices on tungsten cemented carbide products ordered in June, according to available reports. Although these are not direct substitutes for semiconductor-grade WF₆, they reflect the broader pressure on tungsten supply chains.
| Market signal | Reading |
| Chinese exports to Japan zero between Feb-April | Supply risk for raw materials |
| Inventories in some suppliers until mid-2026 | Limited room for alternative sourcing |
| Rising tungsten products prices | Cost pressure before a full crisis |
| Long validation times | Slow supplier substitution |
| Strong memory demand | Reduced ability to absorb shocks |
| Export controls | Political and commercial uncertainty |
The price of this special gas may not be the largest component of a chip’s final cost, but its absence can halt entire processes. That distinguishes a costly material from a critical one. In semiconductors, even a low-volume input can have enormous impacts if no validated substitute is found in time.
Japan seeks to reduce dependency
Japan’s response involves increasing capacity, diversifying supplies, and boosting tungsten recycling. Sumitomo Electric plans to invest around €100 million in a new tungsten production facility to roughly increase capacity by 50%. Mitsubishi Materials also aims to expand processing in Japan and Germany.
Recycling is another strategy. The Japanese industry is trying to increase tungsten scrap use, which currently accounts for about 20%, compared to 50–60% in Europe. Recycling doesn’t immediately meet the need for semiconductor-grade materials but can reduce dependence over the medium term.
| Measure | Likely timeline |
| Increase inventories | Short term, if supply is available |
| Qualify alternative suppliers | Medium term, with technical validations |
| Expand processing in Japan and Germany | Medium to long term |
| Boost tungsten recycling | Medium term |
| Invest in domestic capacity | Long term |
| Diversify outside China | Long term, at higher costs |
Implementing these measures is not immediate. Semiconductor fabs rely on materials validated over years. Changing chemical inputs requires testing, documentation, and customer approval. Geopolitical shifts can be rapid; industrial qualification is slower.
Another reminder of chip supply chain fragility
The potential WF₆ crisis confirms that the semiconductor supply chain depends not only on factories, lithography, and advanced designs but also on special gases, critical metals, high-purity chemicals, wafers, packaging, equipment, energy, and logistics. Any weak link can become a bottleneck.
The tech rivalry involving China, the US, Japan, Korea, and Taiwan is shifting focus toward materials that years ago appeared only in specialized reports. Gallium, germanium, graphite, rare earths, tungsten, and indium are part of an industrial geopolitics where resource control becomes leverage.
Tungsten’s case is especially sensitive due to its connection with memory, AI, and advanced manufacturing. If tensions persist, effects won’t be limited to Japan but will also reach Korean manufacturers, foundries, equipment suppliers, data centers, and consumer markets through higher costs and reduced supply flexibility.
The industry will try to adapt, as always. Yet each episode confirms a tough lesson: technological sovereignty isn’t achieved merely by building chip factories. It also requires control over materials, chemicals, suppliers, recycling, validation, and industrial capacity. Without that layer, even the most advanced factory may depend on a small input that occupies little space but can halt the entire line without it.
Frequently Asked Questions
What is tungsten hexafluoride?
It’s a special gas, WF₆, used in semiconductor manufacturing as a precursor for depositing tungsten films on wafers.
Why is it important for memory?
Because it helps create contacts, vias, and interconnections inside chips like 3D NAND and advanced DRAM, where conductivity and the ability to fill narrow structures are critical.
What about supply to Japan?
Data cited by TrendForce, based on Chinese customs and Kyodo News, show Chinese exports of tungsten carbide and tungsten powder to Japan dropped to zero between February and April 2026.
Could this push memory prices higher?
It might increase costs and prices if the shortage persists. While it doesn’t immediately stop production, it adds risk to a chain already strained by AI demands.
via: trendforce