Highlights

• Strait of Hormuz disruptions threaten nearly half of the global seaborne sulfur trade, with prices surging 165% year-over-year, exposing a critical vulnerability in copper extraction, battery production, and semiconductor manufacturing.
• Modern industrial and military power depends on upstream chemical reagents like sulfuric acid—not just mines or factories—revealing structural blindness in Western supply chain strategy.
• While the U.S. has domestic sulfur production, the real constraint is ultra-high-purity supply and midstream processing capacity, where China maintains systems-level dominance in critical materials like rare earths.

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A new analysis (opens in a new tab) warns that disruptions in the Strait of Hormuz are not just an oil story—they are choking global sulfur supply, a critical input for copper, batteries, and semiconductors. Prices are surging, and while the U.S. produces sulfur domestically, global trade disruptions threaten high-purity supply chains. The deeper message: modern military and industrial power depends on obscure upstream chemicals, not just mines or factories.

The War Beneath the War

The missiles are visible. The crisis is not.

As conflict intensifies near the Strait of Hormuz, roughly 20% of global energy flows are at risk—but so is something far less understood: sulfur. Nearly half of the global seaborne sulfur trade moves through this chokepoint. Prices have surged by more than 165% year-over-year, exposing a quiet truth—modern industrial power runs on chemicals few investors track.

This is not just a commodity story. It is a system's failure in slow motion.

Sulfur: The Invisible Backbone of Industrial Power

Sulfur becomes sulfuric acid—the foundational reagent for extracting copper, nickel, cobalt, and processing semiconductors. Without it:

• Copper production slows (SX/EW ≈ 16% of global output)
• Battery metals face bottlenecks (HPAL dependency)
• Semiconductor fabrication is impaired (ultra-high purity acid)

In rare earth terms, this is familiar. Separation—not mining—is the constraint. Chemistry—not geology—determines output.

Where the Analysis Holds—And Where It Leans

“The Chemistry Constraint Is Real”

The authors all affiliated with Modern War Institute (opens in a new tab) (Morgan Bazilian (opens in a new tab), Macdonald Amoah (opens in a new tab) and Jahara Matisek (opens in a new tab)),  are correct: upstream inputs dictate downstream capacity. This aligns with Rare Earth Exchanges’ long-standing thesis—midstream and chemical processing are the real chokepoints, not resource abundance.

“But Not All Supply Is Equal”

The piece underplays U.S. sulfur resilience. Much sulfur is a byproduct of domestic oil and gas refining. The true vulnerability is narrower: ultra-high-purity and logistics-linked supply, not total availability.

“The Missing Layer: Rare Earth Processing”

Notably absent is rare earth separation. While sulfuric acid is used in REE cracking and leaching, the bigger bottleneck remains solvent extraction capacity—dominated by China. The sulfur story is real, but it is not the primary constraint in rare earth supply chains.

The Real Signal for Investors

This is a warning shot.

The market is relearning a hard lesson: supply chains are ecosystems, not pipelines. A disruption in a “minor” reagent can cascade into copper shortages, battery delays, and defense constraints.

In the Rare Earth Exchanges™ framework—_Great Powers Era 2.0_—this is the game:

• Control the upstream chemistry
• Control the midstream processing
• Control downstream production in magnets, components, and assemblies
• Control the industrial outcome

Rare Earth Exchanges all but predicted the Iran war after the Venezuela intervention. Supply chain choke points become subject to potential militarization and all sorts of statecraft.  Places like Iran will become more influential if America does not execute the right strategy.

But the bigger picture is that, while the West continues to focus on mines, China continues to work furiously to optimize its systems lead.  

Final Take: The Chokepoint Beneath the Chokepoint

Sulfur is not the story. It is the signal.

The real risk is structural blindness—an industrial strategy that sees ores but not reagents, mines but not molecules. If Hormuz teaches anything, it is this: the next supply chain shock won’t come from where policymakers are looking.

And by the time it’s visible, it’s already too late.