China halts sulfuric acid exports

China’s move is simple on paper and messy in practice: a chemical that usually moves quietly between tankers, mines, and factories is now set to stop leaving the world’s biggest exporting country in May, according to Bloomberg’s April 10 report. China accounted for 14.8% of global sulfuric acid exports in 2024, and its December 2025 exports alone reached $35.7 million, with Indonesia, Chile, and the Philippines among the biggest buyers. (bloomberg.com) (oec.world) Sulfuric acid is not a niche lab chemical. The United States Geological Survey says sulfur, mainly through sulfuric acid, sits at the center of the fertilizer and industrial economy, and the Environmental Protection Agency says fertilizer is the single biggest use, taking roughly 60% to 75% of sulfuric acid consumption. (usgs.gov) (epa.gov) That is why fertilizer buyers notice this first. The standard route to phosphate fertilizer starts by reacting phosphate rock with sulfuric acid to make phosphoric acid, and that phosphoric acid is then turned into products like diammonium phosphate and monoammonium phosphate that farmers spread on fields. (usgs.gov) (elessentct.com) Battery makers notice it too, but one step earlier in the chain. Nickel-rich cathodes are built from metal sulfates such as nickel sulfate, manganese sulfate, and cobalt sulfate, and published battery-process research describes sulfuric-acid leaching as a standard way to make those sulfate feedstocks. (springer.com) (pubs.rsc.org) (nature.com) Chip factories use a cleaner version of the same molecule. Semiconductor plants buy ultra-high-purity sulfuric acid for wafer cleaning, and suppliers like Sumitomo Chemical and PVS describe impurity limits down at parts-per-trillion levels because even tiny metal contamination can cut chip yields. (sumitomo-chem.co.jp) (pvschemicals.com) The timing makes the shock bigger. Bloomberg said the export halt lands while the Iran war is already choking raw-material flows, and market reporting in March said disruption around the Strait of Hormuz was tightening sulfur supply and pushing up shipping costs before this China decision even arrived. (bloomberg.com) (news.metal.com) This is not the first warning shot from Beijing. CNBC reported on March 31 that China had already called for tighter sulfuric acid export limits in December 2025, so the May stop looks less like a one-day surprise and more like the next step in a longer policy squeeze on strategic industrial materials. (cnbc.com) The countries with the fastest problem are the ones that were already buying Chinese cargoes. Observatory of Economic Complexity data for December 2025 shows Indonesia took $20.6 million of China’s sulfuric acid exports that month, Chile took $5.85 million, the Philippines took $3.7 million, and Saudi Arabia took $2.43 million, which means replacement supply now has to be found on short notice. (oec.world) What happens next is less about one acid tank and more about rerouting an industrial plumbing system. Fertilizer producers can try to secure more sulfuric acid locally, battery-material refiners can hunt for alternative sulfate feedstocks, and chip chemical buyers can lean harder on specialty suppliers outside China, but every one of those moves costs time, freight, and money. (epa.gov) (springer.com) (sumitomo-chem.co.jp) The immediate signal to markets is not that the world runs out of sulfuric acid in May. The signal is that a commodity most people never think about has become strategic enough that China is willing to keep more of it at home just as fertilizer, battery, and semiconductor supply chains are already under strain. (bloomberg.com) (usgs.gov)