China Targets ASML Supply Chain via German Specialist

It is not ASML itself, but a small German supplier that has suddenly become the focus of a geopolitical conflict. Sindlhauser Materials GmbH is part of the ASML supply chain and depends on Chinese rare earths and other critical raw materials. Since China placed the company on an export control list, an inconspicuous specialist has suddenly become a strategic risk.

A high-end lithography machine can ultimately be held up by the smallest component

ASML builds some of the most complex machines in the world. Tens of thousands of individual parts, optics, coatings, sensors, vacuum technology and specialist materials have to work together perfectly. That is precisely why not only the Dutch company itself is strategically important, but also its network of smaller suppliers. Sindlhauser is a good example. The company works with specialist materials and coatings and is relevant to parts of the ASML supply chain. In July 2026, China placed the company, along with several other European companies, on an export control list. The official justification was alleged links to Taiwan. However, the timing, following European sanctions against Chinese companies under the 21st EU sanctions package, is hard to ignore. A trade conflict is thus becoming a problem for the semiconductor supply chain.

The nature of the restrictions is particularly problematic. Simply involving an intermediary is not enough. Foreign companies, too, may not freely resell certain Chinese-origin dual-use goods to sanctioned companies. This makes the usual workaround through third countries considerably more difficult.

For a company that depends heavily on Chinese rare earths and other critical materials, this can quickly become an existential issue. That is precisely why the EU is now negotiating an unusual solution with China. Apparently, a reciprocal swap is under discussion: the EU removes a Chinese company from its sanctions list, and China, in return, removes Sindlhauser. This may sound almost banal, but it clearly shows how interconnected modern supply chains are. ASML itself is not sanctioned. An EUV machine does not stop just because China places a German supplier on a list. But if that supplier provides a specialist material or coating that no one else can produce to the same quality at short notice, that alone can eventually be enough. This is where the debate technological sovereignty quickly becomes uncomfortable. Building a semiconductor factory in Europe is not enough. Having ASML in Europe is not enough either. What matters is the entire chain, all the way down to raw materials, chemicals, coatings and highly specialized small suppliers. China has a strong position in precisely this area. The country dominates the processing and export of several rare earths and critical minerals. Europe, in turn, has one of the world’s most important levers for modern semiconductor production in the form of ASML. Both sides therefore have vulnerabilities.

It is also notable how precisely such sanctions are now being imposed. Political pressure is not necessarily applied where the biggest name is on the building. It can be far more effective to target a small supplier whose product has no readily available substitute. That is precisely why supply chain analyses are now becoming important to security policy. Anyone who knows which company supplies which specialist material, and what alternatives are realistically available, knows where an industry’s real vulnerabilities lie. In parallel, the EU is trying to reduce such dependencies. This includes new raw material projects within Europe and closer partnerships with countries such as Vietnam. The problem is time. A new rare earth supply chain cannot be established in six months. Mining sites, refining, processing and certification take years.

The Sindlhauser case is therefore less an ASML story than a reminder of how fragile even the most advanced semiconductor industry remains at inconspicuous points in the supply chain.

Europe often talks its own fabs, Chips Acts and technological independence. The current case shows that this is only half the story. When a small materials supplier is thrown into difficulty by export controls and this unsettles a high-end supply chain, the underlying problem runs deeper. An industry is sovereign only when not just its large factories, but also its raw materials, coatings and specialist components are secured.