Key Takeaways
- • Dual supply shocks have doubled sulfuric acid prices in seven weeks: The Strait of Hormuz closure (late February 2026) and China's export ban (effective May 1, 2026) have removed approximately 2.8 million metric tons of annual supply, with the S&P Global Platts CFR Mejillones benchmark rising from $190/mt to $380/mt between February 25 and April 15, 2026—a 100% increase capped by a single-week spike of 26.7% following the China announcement.
- • Chile faces acute supply vulnerability with 20% of copper output at risk: Chile imports 4 million metric tons of sulfuric acid annually (37.1% from China, 24.1% from Peru, 11.1% from Japan), and approximately 1.1 million metric tons of refined copper production—20% of national output—depends on acid-intensive SX-EW heap leaching; buyers have secured H1 2026 needs but left H2 substantially uncovered, forcing return to market in May.
- • Contractual relief hinges entirely on governing law and clause language: English law provides no implied force majeure doctrine; relief depends exclusively on contract terms and requires proof of impossibility (not mere cost increase), while civil-law jurisdictions (Peru, UAE, Chile) offer hardship and excesiva onerosidad doctrines permitting renegotiation or termination on grounds of fundamental contractual disturbance—a materially lower threshold.
- • Supply-gap closure is structurally impossible in the near term: Japan, South Korea and India combined can increase exports by only 0.5 million metric tons against China's reduction of 2.8 million metric tons; new acid production capacity requires 18–24 months from permitting to ramp-up, ensuring continued market tightness through year-end 2026.
- • Procedural compliance—notice timing, documentation, and mitigation evidence—is the primary determinant of dispute outcomes: Tribunals consistently reject FM claims on procedural grounds (late notice, incomplete documentation, or failure to evidence mitigation) even where the underlying event is substantively meritorious; contemporaneous evidentiary preservation is now non-negotiable for any party with material exposure.
Summary
The global sulfuric acid market is experiencing a supply shock of unprecedented severity since 2008, driven by two independent but converging disruptions. The Strait of Hormuz closure beginning in late February 2026 has eliminated seaborne access to the Middle East, which accounts for approximately one-third of global sulfur production and roughly half of seaborne sulfur trade. Qatar, a principal regional processing hub, has experienced direct production interruptions. Concurrently, China—accounting for over 40% of global sulfuric acid output—announced on April 10, 2026 that it will halt sulfuric acid exports effective May 1, 2026, citing protection of domestic phosphate fertilizer production and food security. Chinese customs data reveal the severity of the contraction: shipments to Chile fell from 151,268 metric tons in March 2025 to 31,870 metric tons in February 2026 to zero in March 2026. This follows China's January 2026 imposition of a 700,000 metric ton export quota (down sharply from 1.3 million metric tons in the same 2025 period), and Russia's extension of its own sulfur export ban through June 2026.
The price impact has been severe and rapid. The S&P Global Platts CFR Mejillones benchmark—the standard reference for Chilean copper miners—rose from $190/mt on February 25 to $300/mt on April 8, $380/mt on April 15, representing a doubling in under seven weeks; a single-week spike of 26.7% followed the China announcement. Chile, the world's largest importer at 4 million metric tons annually, has been hardest hit: approximately 20% of Chilean copper output (1.1 million metric tons of refined production) depends on acid-intensive SX-EW heap leaching. Peruvian operations, the DRC, Zambia, and Indonesia face comparable structural dependency. Delivered prices in the DRC have reached $1,000–$1,400/mt. Zambia introduced a permanent permit-based export control system on March 27, 2026, citing "critical market imbalance." The supply gap cannot be closed quickly: Japan, South Korea and India combined can increase exports by only 0.5 million metric tons against China's reduction of approximately 2.8 million metric tons; new acid production capacity requires 18–24 months from permitting to ramp-up.
Producers and off-takers operating long-term supply contracts at prices and volumes no longer available in the physical market face a fragmented legal landscape. Relief mechanisms—force majeure, hardship, material adverse change, and excesiva onerosidad—operate under materially different standards across English law, New York law, Chilean law, Peruvian law, and UAE law. Under English law and New York law, force majeure is not an implied common-law doctrine; relief depends entirely on express contractual language, and the causal threshold is demanding: the affected party must show not merely increased cost but impossibility or material hindrance, with tribunals scrutinizing causal chains closely and discounting FM where financial stress, inadequate contingency planning, or availability of alternatives materially contributed to non-performance. New York's UCC § 2-615 excuses sellers from performance where a government export prohibition constrains the seller directly—a Chinese export ban will excuse a Chinese seller's non-delivery—but a non-Chinese seller cannot invoke the provision merely because upstream supply has been disrupted. Frustration doctrine under English law applies only where performance is rendered impossible or radically different from agreement; a doubling of input price, however punishing, is insufficient unless the contract specifically requires performance from a source rendered legally unavailable.
Civil-law jurisdictions offer more expansive relief. Peru's Article 1440 codifies excesiva onerosidad, permitting judicial adjustment of consideration or termination where extraordinary and unforeseeable events render performance excessively onerous—a meaningfully lower bar than English-law frustration or UCC impracticability. UAE onshore law codifies both force majeure (Article 273) and hardship (Article 249), the latter permitting court adjustment where performance has become oppressive due to exceptional circumstances of "general nature" (excluding purely commercial shocks). Chile lacks a codified hardship doctrine but some arbitral tribunals have applied hardship-style relief via the good-faith principle in Article 1546 of the Civil Code, though case law is uneven. A critical procedural distinction cuts across all jurisdictions: success or failure of FM, MAC, or hardship claims typically turns on the strength of contemporaneous evidentiary records—board minutes, supplier correspondence, customs data, documented mitigation efforts, and contemporaneous risk assessments demonstrating what the parties knew at contracting versus the current state. Reconstructed records prepared after disputes crystallize are routinely discounted.
Affected parties should immediately audit their contract portfolios by governing law, mapping each supply agreement to its FM clause, indexation mechanism, price-review and hardship provisions, and any embargo or export-restriction carve-outs. Notice must be issued on the shortest applicable timetable and in the form required by contract; late or incomplete notice is the single most common procedural reason meritorious FM claims fail. Evidentiary preservation is now an immediate operational obligation: parties must collect documentation of triggering events, the causal chain to non-performance, alternative-sourcing inquiries, rerouting attempts, and renegotiation correspondence. The existence of price-adjustment or indexation clauses will be the counterparty's primary line of defense and must be addressed head-on in any notice or pleading. Negotiated solutions—temporary volume reductions, price collars, deferred deliveries—are generally preferable
The price impact has been severe and rapid. The S&P Global Platts CFR Mejillones benchmark—the standard reference for Chilean copper miners—rose from $190/mt on February 25 to $300/mt on April 8, $380/mt on April 15, representing a doubling in under seven weeks; a single-week spike of 26.7% followed the China announcement. Chile, the world's largest importer at 4 million metric tons annually, has been hardest hit: approximately 20% of Chilean copper output (1.1 million metric tons of refined production) depends on acid-intensive SX-EW heap leaching. Peruvian operations, the DRC, Zambia, and Indonesia face comparable structural dependency. Delivered prices in the DRC have reached $1,000–$1,400/mt. Zambia introduced a permanent permit-based export control system on March 27, 2026, citing "critical market imbalance." The supply gap cannot be closed quickly: Japan, South Korea and India combined can increase exports by only 0.5 million metric tons against China's reduction of approximately 2.8 million metric tons; new acid production capacity requires 18–24 months from permitting to ramp-up.
Producers and off-takers operating long-term supply contracts at prices and volumes no longer available in the physical market face a fragmented legal landscape. Relief mechanisms—force majeure, hardship, material adverse change, and excesiva onerosidad—operate under materially different standards across English law, New York law, Chilean law, Peruvian law, and UAE law. Under English law and New York law, force majeure is not an implied common-law doctrine; relief depends entirely on express contractual language, and the causal threshold is demanding: the affected party must show not merely increased cost but impossibility or material hindrance, with tribunals scrutinizing causal chains closely and discounting FM where financial stress, inadequate contingency planning, or availability of alternatives materially contributed to non-performance. New York's UCC § 2-615 excuses sellers from performance where a government export prohibition constrains the seller directly—a Chinese export ban will excuse a Chinese seller's non-delivery—but a non-Chinese seller cannot invoke the provision merely because upstream supply has been disrupted. Frustration doctrine under English law applies only where performance is rendered impossible or radically different from agreement; a doubling of input price, however punishing, is insufficient unless the contract specifically requires performance from a source rendered legally unavailable.
Civil-law jurisdictions offer more expansive relief. Peru's Article 1440 codifies excesiva onerosidad, permitting judicial adjustment of consideration or termination where extraordinary and unforeseeable events render performance excessively onerous—a meaningfully lower bar than English-law frustration or UCC impracticability. UAE onshore law codifies both force majeure (Article 273) and hardship (Article 249), the latter permitting court adjustment where performance has become oppressive due to exceptional circumstances of "general nature" (excluding purely commercial shocks). Chile lacks a codified hardship doctrine but some arbitral tribunals have applied hardship-style relief via the good-faith principle in Article 1546 of the Civil Code, though case law is uneven. A critical procedural distinction cuts across all jurisdictions: success or failure of FM, MAC, or hardship claims typically turns on the strength of contemporaneous evidentiary records—board minutes, supplier correspondence, customs data, documented mitigation efforts, and contemporaneous risk assessments demonstrating what the parties knew at contracting versus the current state. Reconstructed records prepared after disputes crystallize are routinely discounted.
Affected parties should immediately audit their contract portfolios by governing law, mapping each supply agreement to its FM clause, indexation mechanism, price-review and hardship provisions, and any embargo or export-restriction carve-outs. Notice must be issued on the shortest applicable timetable and in the form required by contract; late or incomplete notice is the single most common procedural reason meritorious FM claims fail. Evidentiary preservation is now an immediate operational obligation: parties must collect documentation of triggering events, the causal chain to non-performance, alternative-sourcing inquiries, rerouting attempts, and renegotiation correspondence. The existence of price-adjustment or indexation clauses will be the counterparty's primary line of defense and must be addressed head-on in any notice or pleading. Negotiated solutions—temporary volume reductions, price collars, deferred deliveries—are generally preferable
Go deeper than the headline
Research every firm in this story, track the ones that matter and get the daily briefing — free for 7 days.