China is intensifying its scrutiny of indium exports. The move does not point to the traditional rare-earth chess match, but to a more concealed supply-chain front that is more characteristic of the AI era: indium is the critical raw material for producing indium phosphide (InP), and InP is the irreplaceable substrate for the high-speed optical chips used in AI data centers. With the United States having already placed indium phosphide on its export-control list and Chinese companies restricted from accessing advanced chips, Beijing's tightening of upstream raw indium exports completes a full retaliation loop.
What Indium Is, and Why It Suddenly Matters
Indium is a silvery-white rare metal with an extremely low crustal abundance, typically recovered as a by-product of zinc refining. China produces nearly 70 percent of the world's indium, giving it a near-monopoly position in the global supply chain.
The metal's principal traditional use is the production of indium tin oxide (ITO) targets — the core material in virtually every liquid-crystal display and touch panel. This is where most people's acquaintance with indium begins: the display industry.
But what has truly placed indium at the center of the strategic stage in 2026 is its other use — indium phosphide (InP) substrates. InP is the substrate material for manufacturing the high-speed optical chips that AI data centers depend on. In the compute infrastructure for AI inference and training, data-transmission speed is one of the core bottlenecks, and InP-based photonic chips hold a physically irreplaceable advantage precisely in high-speed data transmission.
As the global AI arms race shifts from "is there enough compute?" to "can data move fast enough?", indium's strategic value leaps from "display material" to "cornerstone mineral of the AI era."
The Two-Layer Structure of the Game
Layer One: China's Proactive Tightening
In June 2026, indium buyers in Europe and North America were, for the first time, required to disclose end-user information. According to Reuters, one European buyer was asked by Chinese customs for detailed information about its home country, while North American buyers suspected that the new declaration requirement was "a precursor to export restrictions or an outright ban."
The change follows indium phosphide's addition to China's export-control list in February 2025. The chain of logic is clear: first control the export of the more technologically sophisticated product, indium phosphide (February 2025), then progressively tighten export scrutiny of the upstream raw material, indium (mid-2026) — a tiered control path running from finished goods down to raw materials, of a piece with the playbook of rare-earth controls.
Layer Two: America's Reactive Response
Indium has been identified by the U.S. Department of Defense as a "potentially vulnerable" link. In early 2026, the U.S. Defense Logistics Agency (DLA) issued a solicitation planning to stockpile up to 403 tons of indium within three years. The move itself shows that Washington has come to recognize a hard fact: on the indium supply chain, the United States has virtually no alternative sources of supply.
An even more urgent signal comes from industry. In May 2026, the CEO of Nvidia-backed chipmaker Coherent accompanied President Trump to Beijing and specifically lobbied on the indium phosphide export-control issue — this was no ordinary commercial lobbying effort, but a matter elevated directly to a presidential-level trade-negotiation agenda item.
Since indium phosphide was placed on the control list in 2025, it has posed a substantive constraint on next-generation data centers. Along the global AI-chip industry chain, whether an advanced-process photonic-chip company can secure a stable supply of InP is becoming a decisive competitive factor. China's tightening of upstream indium exports means the bottleneck on this chain is migrating from the "substrate material" stage further upstream, to the "raw material" stage.
Structural Reading: This Is Not an Isolated Mineral Game
China's tightening of indium export scrutiny follows a strategy path highly consistent with its escalation of export controls in recent years, yet in the AI context it carries a distinctive strategic significance.
The difference from rare-earth controls is this: rare-earth controls target the full-spectrum impact on America's defense-industrial and new-energy sectors, whereas indium controls aim directly at one specific link in AI infrastructure — data transmission. That means China is shifting from "full-spectrum pressure" to "precision strikes" — using an inconspicuous niche metal to grip the throat of an entire industry chain at the critical nodes of AI competition.
At the same time, the strategy contains an internal paradox: China is both the largest producer of indium and one of the largest consumer markets for AI chips. Tightening too hard could incentivize the United States to accelerate the search for alternatives — indium recycling technology, substitute substrate materials (such as silicon photonics), or non-Chinese sources of indium supply. America's 403-ton stockpiling plan is already one clear signal of exactly that.
Sputnik (Russian state news agency) · 2026-06-23 10:44 — China tightens indium export scrutiny amid growing AI demand (deep)
Original Reuters reporting: the escalation of China's indium export scrutiny, the Coherent CEO's Beijing lobbying, and the DLA's 403-ton stockpiling plan