China’s Rare Earth Pause Turns November 10 Into a Datacenter Supply Deadline

A Decision in Beijing Could Squeeze Two Elements Most People Have Never Heard Of

On November 10, 2026, the Chinese government has to decide what happens next to a set of export controls it agreed to pause less than a year ago. The decision will not make headlines the way a chip ban or a tariff announcement does, but it could matter more to how datacenters actually get built: it covers erbium and yttrium, two rare earth elements that rarely come up in conversations about AI infrastructure and yet sit inside the fiber optic links, capacitors and turbines that keep hyperscale datacenters running.

The Register reported on August 28 that the paused controls, drawing on an IEEE Spectrum analysis published two days earlier, are already reshaping how much of these materials reach the United States, months before Beijing has to make its call.

What Erbium and Yttrium Actually Do Inside a Datacenter

Neither element moves in large volumes, and that is precisely the point industry consultant Thomas Kruemmer makes in the IEEE Spectrum piece: tiny quantities of rare earths can have an outsized impact by enabling core functionality.

Erbium’s job is narrow and specific. It dopes the fiber inside erbium-doped fiber amplifiers, the devices that boost a fading optical signal back to strength as it travels down a long-distance cable. Terrestrial fiber networks need one roughly every 80 to 120 kilometers; submarine cables, which have to survive years underwater without maintenance, need one every 50 to 80 kilometers. Every long-haul link connecting one hyperscale datacenter to another depends on a chain of these amplifiers, and, in the words of Eric Bender of the rare earth company Tronox, “there is no one that I’m aware of, outside of China, that makes erbium oxide on a commercial scale.”

Yttrium’s uses are more varied but no less embedded in datacenter hardware. It is a component in the multilayer ceramic capacitors used throughout AI datacenter electronics, in the thermal barrier coatings that protect turbine blades in jet engines and in the combustion turbines that power some datacenters, and in white LEDs, microwave filters and solid-state lasers. China mines about 90 percent of the world’s yttrium and processes nearly all of the world’s mined ore into a form industry can actually use.

A Rulebook China Keeps Rewriting

The current squeeze traces back to April 2025, when China imposed export license requirements on seven rare earth elements, including yttrium, as part of its retaliation against the Trump administration’s tariffs. Those licensing rules are still in force, and they are already visibly throttling supply: yttrium shipments to the United States are down around 75 percent so far this year compared with 2025, with a 60-tonne yttrium oxide shipment in March followed by just 10 tonnes in April, according to IEEE Spectrum.

Beijing followed up in October 2025 with a tougher second wave covering five more elements, including erbium, holmium, thulium, europium and ytterbium. That wave went further than the April rules: it would require a license before shipping any product made anywhere in the world that contains Chinese-sourced rare earths above a small threshold, a mechanism The Register compares to the way Washington restricts the export of ASML’s chipmaking equipment to China. Beijing suspended that second wave for 12 months as part of the trade truce reached after talks between the US and China, which is what set up the November 10, 2026 deadline.

What Happens If the Suspension Lifts

If China lets the October 2025 rules take effect on schedule, erbium would move from supplied but tightly licensed to the same kind of chokepoint yttrium already represents. Nothing about the underlying supply picture makes that an easy problem to route around. Citing 2024 data from the International Energy Agency, The Register notes China accounted for about 60 percent of global mining output of the rare earths used in magnets, and an even larger 91 percent of global separation and refining capacity for that same group. For erbium and yttrium specifically, IEEE Spectrum’s reporting puts China’s control closer to total.

The timing is not incidental. Relations between Washington and Beijing remain strained over trade, and a summit between President Trump and President Xi Jinping is expected next month, ahead of the deadline.

Washington Is Spending Billions, Just Not Obviously on These Two Elements

The US government has moved several billion-dollar initiatives since the trade dispute began, and it is worth being precise about what each one actually covers. In February 2026, the Trump administration launched Project Vault, a $12 billion public-private critical minerals stockpile built around a $10 billion, 15-year loan from the US Export-Import Bank plus roughly $2 billion in private capital, with participants that include General Motors, Stellantis, GE Vernova, Google and Boeing. In August, the Pentagon committed $750 million to a $1.55 billion deal securing rare earth carbonates from Serra Verde’s Pela Ema project in Brazil, and the Department of Energy awarded $500 million across seven critical mineral and battery projects.

The clearest of these is not aimed at erbium or yttrium at all. The Brazil deal is built around dysprosium, terbium, neodymium and praseodymium, the elements used in permanent magnets for defense systems, electric motors and wind turbines, which is where most of the public attention on rare earth security has been focused. Project Vault’s stockpile authority is broad enough to eventually cover any of the more than 50 minerals the Interior Department lists as critical, but Gareth Hatch of Strategic Minerals Advisory told IEEE Spectrum that very few people outside China are even asking yet how to produce erbium or yttrium domestically. Riston Rocchio-Heller of Oerlikon Metco, a company that already buys yttrium, put it more bluntly: the erratic availability over the past year has “thrown us upside down.”

Why Datacenter Operators Should Be Watching a Trade Deadline

None of this is likely to halt datacenter construction outright by November 11. Erbium’s tougher new restrictions are still suspended, and yttrium, while down sharply, is still shipping in some volume. But the pattern is one datacenter operators have seen before with other components: a supply chain running near total dependence on one country, a shortage that shows up quietly in orders and lead times well before it shows up in headlines, and remediation efforts that take years to build capacity the market needs immediately. Samsung’s own warning in July that the global memory chip shortage will persist through 2028 followed a similar shape: a squeeze that started in one narrow part of the supply chain and rippled out to affect anyone building AI infrastructure.

Whether November 10 brings a full reimposition, an extended suspension or something in between, the elements at the center of the decision will keep doing the same quiet work they always have: carrying light down a fiber optic cable, and holding a charge inside a capacitor no one thinks about until it is missing.