China has begun strategically slowing exports of critical materials used in semiconductor fabrication to Taiwan, according to Tom's Hardware, with germanium and quartz shipments to the region also under threat — a combination that puts the optical and robotics supply chains at risk alongside chipmaking itself.

The reported slowdown targets inputs that fabs in Taiwan — the center of global leading-edge semiconductor production — depend on for manufacturing processes. By constraining the flow of these materials, Beijing adds a new point of leverage over a supply chain that already sits at the intersection of trade disputes and export-control escalation between China, the United States and their respective technology sectors.

Germanium and quartz deserve particular attention. Both materials serve industries well beyond semiconductors.

• Germanium is used in infrared optics, fiber optics, and certain semiconductor substrates and optical components.
• Quartz, in high-purity form, is essential for crucibles and furnace hardware used in silicon crystal growth, as well as for optical applications.
• Robotics supply chains depend on optical sensors, lenses and precision components that draw on both material streams.

The Tom's Hardware report frames the export slowdown as deliberate rather than incidental. A strategic throttle on these flows does not require an outright ban to be effective. Administrative delays, licensing friction and reduced allocation can cut deliveries sharply while leaving formal policy unchanged — a pattern consistent with how China has managed other critical-material exports since it imposed export controls on gallium and germanium in 2023.

What does the slowdown change for Taiwan's fabs?

Taiwan hosts the world's most advanced contract chipmaking capacity, and its fabs source many specialty materials through international trade channels in which China holds a dominant refining and processing position. If germanium and other fabrication inputs arrive late or in reduced volumes, wafer production schedules tighten.

The effect is unlikely to be immediate. Fabricators typically hold inventories of critical inputs and qualify alternative suppliers over months, not weeks. But a sustained slowdown would force buyers to pay more, seek non-Chinese sources, or absorb production risk — costs that propagate downstream to chip customers in automotive, computing and industrial equipment markets.

Why do germanium and quartz matter beyond chips?

The report's second finding — that exports of germanium and quartz to the region threaten the optical and robotics supply chains — widens the impact beyond semiconductor fabrication.

Germanium lenses and windows are core components in infrared imaging systems, and the metal is used in fiber-optic infrastructure. High-purity quartz is a structural material for the crucibles in which semiconductor-grade silicon is melted and grown into ingots; without it, even silicon production upstream of wafering stalls. Robotics manufacturers, in turn, rely on optical encoders, sensors and camera modules that use these materials.

A constraint at this level of the stack therefore touches multiple industries simultaneously. That multiplicity is what gives the measure its weight: one administrative decision in the materials tier reaches chips, optics and automation at once.

How does this fit the broader export-control picture?

Beijing's move continues a pattern of tit-for-tat measures in the technology trade conflict. China has previously used restrictions on gallium, germanium, graphite and rare-earth processing to answer Western export controls on advanced semiconductors and chipmaking equipment. Targeting Taiwan specifically — rather than global export volumes — marks a more geographically focused application of that toolkit.

For procurement teams, the message is direct. Diversification of germanium and quartz supply, buffer inventories and requalification of alternative material sources now rank as near-term priorities. For policymakers in Taipei, Washington and Brussels, the report adds evidence that critical-material dependence on a single dominant supplier remains a live operational vulnerability, not a theoretical one.

Tom's Hardware reports that the slowdown covers critical materials used in semiconductor fabrication sent to Taiwan, with germanium and quartz flows to the region also under pressure, threatening the optical and robotics supply chains. No timeline for easing the restrictions appears in the report, and quantified export volumes were not specified.